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Subject: svn commit: r735939 [4/5] - in
 /harmony/enhanced/classlib/branches/java6: ./
 modules/auth/META-INF/ modules/beans/src/main/java/java/beans/
 modules/beans/src/test/java/org/apache/harmony/beans/tests/java/beans/
 modules/beans/src/test/support/java/org/a...
Date: Tue, 20 Jan 2009 05:47:41 -0000
To: commits@harmony.apache.org
From: tonywu@apache.org
Message-Id: <20090120054747.B11B72388ACB@eris.apache.org>

Modified: harmony/enhanced/classlib/branches/java6/modules/prefs/src/test/java/org/apache/harmony/prefs/tests/java/util/prefs/AbstractPreferencesTest.java
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/branches/java6/modules/prefs/src/test/java/org/apache/harmony/prefs/tests/java/util/prefs/AbstractPreferencesTest.java?rev=735939&r1=735938&r2=735939&view=diff
==============================================================================
--- harmony/enhanced/classlib/branches/java6/modules/prefs/src/test/java/org/apache/harmony/prefs/tests/java/util/prefs/AbstractPreferencesTest.java (original)
+++ harmony/enhanced/classlib/branches/java6/modules/prefs/src/test/java/org/apache/harmony/prefs/tests/java/util/prefs/AbstractPreferencesTest.java Mon Jan 19 21:47:38 2009
@@ -42,8 +42,6 @@
 import org.apache.xpath.XPathAPI;
 import org.w3c.dom.Document;
 import org.w3c.dom.Node;
-import org.xml.sax.EntityResolver;
-import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 
 /**
@@ -52,1706 +50,1708 @@
  */
 public class AbstractPreferencesTest extends TestCase {
 
-	AbstractPreferences pref;
+    AbstractPreferences pref;
 
-	static AbstractPreferences root = null;
+    static AbstractPreferences root = null;
 
-	static AbstractPreferences parent = null;
+    static AbstractPreferences parent = null;
 
-	final static String longKey;
+    final static String longKey;
 
-	final static String longValue;
-
-	final static String longName;
-
-	MockNodeChangeListener nl;
-
-	MockPreferenceChangeListener pl;
-
-	static {
-		StringBuffer key = new StringBuffer(Preferences.MAX_KEY_LENGTH);
-		for (int i = 0; i < Preferences.MAX_KEY_LENGTH; i++) {
-			key.append('a');
-		}
-		longKey = key.toString();
-		StringBuffer value = new StringBuffer(Preferences.MAX_VALUE_LENGTH);
-		for (int i = 0; i < Preferences.MAX_VALUE_LENGTH; i++) {
-			value.append('a');
-		}
-		longValue = value.toString();
-
-		StringBuffer name = new StringBuffer(Preferences.MAX_NAME_LENGTH);
-		for (int i = 0; i < Preferences.MAX_NAME_LENGTH; i++) {
-			name.append('a');
-		}
-		longName = name.toString();
-	}
-
-	protected void setUp() throws Exception {
-		super.setUp();
-		root = (AbstractPreferences) Preferences.userRoot();
-		parent = (AbstractPreferences) Preferences
-				.userNodeForPackage(Preferences.class);
-		// FIXME: change here is dangerous
-		// pref = new MockAbstractPreferences((AbstractPreferences) parent,
-		// "mock");
-
-		pref = (AbstractPreferences) parent.node("mock");
-	}
-
-	protected void tearDown() throws Exception {
-		try {
-			if (pref instanceof MockAbstractPreferences) {
-				((MockAbstractPreferences) pref)
-						.setResult(MockAbstractPreferences.NORMAL);
-			}
-			pref.removeNode();
-		} catch (Exception e) {
-		}
-		super.tearDown();
-	}
-
-	public void testConstructor() throws BackingStoreException {
-		try {
-			pref = new MockAbstractPreferences(
-					(AbstractPreferences) Preferences.userRoot(), "mo/ck");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref = new MockAbstractPreferences(null, "mock");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			new MockAbstractPreferences(null, " ");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			new MockAbstractPreferences(pref, "");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			new MockAbstractPreferences(pref, null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		new MockAbstractPreferences(pref, " ");
+    final static String longValue;
+
+    final static String longName;
+
+    MockNodeChangeListener nl;
+
+    MockPreferenceChangeListener pl;
+
+    static {
+        StringBuffer key = new StringBuffer(Preferences.MAX_KEY_LENGTH);
+        for (int i = 0; i < Preferences.MAX_KEY_LENGTH; i++) {
+            key.append('a');
+        }
+        longKey = key.toString();
+        StringBuffer value = new StringBuffer(Preferences.MAX_VALUE_LENGTH);
+        for (int i = 0; i < Preferences.MAX_VALUE_LENGTH; i++) {
+            value.append('a');
+        }
+        longValue = value.toString();
+
+        StringBuffer name = new StringBuffer(Preferences.MAX_NAME_LENGTH);
+        for (int i = 0; i < Preferences.MAX_NAME_LENGTH; i++) {
+            name.append('a');
+        }
+        longName = name.toString();
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        root = (AbstractPreferences) Preferences.userRoot();
+        parent = (AbstractPreferences) Preferences
+        .userNodeForPackage(Preferences.class);
+        // FIXME: change here is dangerous
+        // pref = new MockAbstractPreferences((AbstractPreferences) parent,
+        // "mock");
+
+        pref = (AbstractPreferences) parent.node("mock");
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        try {
+            if (pref instanceof MockAbstractPreferences) {
+                ((MockAbstractPreferences) pref)
+                .setResult(MockAbstractPreferences.NORMAL);
+            }
+            pref.removeNode();
+        } catch (Exception e) {
+        }
+        super.tearDown();
+    }
+
+    public void testConstructor() throws BackingStoreException {
+        try {
+            pref = new MockAbstractPreferences(
+                    (AbstractPreferences) Preferences.userRoot(), "mo/ck");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref = new MockAbstractPreferences(null, "mock");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            new MockAbstractPreferences(null, " ");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            new MockAbstractPreferences(pref, "");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            new MockAbstractPreferences(pref, null);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        new MockAbstractPreferences(pref, " ");
 
         Preferences p2 = new MockAbstractPreferences(null, "");
-		assertNotSame(p2, Preferences.systemRoot());
-		assertNotSame(p2, Preferences.userRoot());
-		assertFalse(p2.isUserNode());
-
-		p2 = new MockAbstractPreferences((AbstractPreferences) Preferences
-				.userRoot(), "mock");
-		assertNotSame(p2, pref);
-		p2.removeNode();
-	}
-
-	public void testProtectedFields() throws BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = new MockAbstractPreferences(pref, "newNode");
-		assertFalse(p.getNewNode());
-		assertSame(p.getLock().getClass(), Object.class);
-
-		p = (MockAbstractPreferences) pref.node("child");
-		assertTrue(p.getNewNode());
-
-		p = (MockAbstractPreferences) ((MockAbstractPreferences) pref)
-				.publicChildSpi("child2");
-		assertTrue(p.getNewNode());
-	}
-
-	public void testToString() {
-		assertEquals("User Preference Node: " + pref.absolutePath(), pref
-				.toString());
-
-		pref = new MockAbstractPreferences((AbstractPreferences) Preferences
-				.systemRoot(), "mock");
-		assertEquals("System Preference Node: " + pref.absolutePath(), pref
-				.toString());
-	}
-
-	public void testAbsolutePath() {
-		assertEquals("/java/util/prefs/mock", pref.absolutePath());
-
-		pref = new MockAbstractPreferences(pref, " ");
-		assertEquals("/java/util/prefs/mock/ ", pref.absolutePath());
-	}
-
-	public void testChildrenNames() throws BackingStoreException {
-		assertEquals(0, pref.childrenNames().length);
-
-		// MockAbstractPreferences child1 = new MockAbstractPreferences(pref,
-		// "child1");
-		// MockAbstractPreferences child2 = new MockAbstractPreferences(pref,
-		// "child2");
-		// MockAbstractPreferences child3 = new MockAbstractPreferences(pref,
-		// "child3");
-		// MockAbstractPreferences subchild1 = new
-		// MockAbstractPreferences(child1,
-		// "subchild1");
-		Preferences child1 = pref.node("child1");
+        assertNotSame(p2, Preferences.systemRoot());
+        assertNotSame(p2, Preferences.userRoot());
+        assertFalse(p2.isUserNode());
+
+        p2 = new MockAbstractPreferences((AbstractPreferences) Preferences
+                .userRoot(), "mock");
+        assertNotSame(p2, pref);
+        p2.removeNode();
+    }
+
+    public void testProtectedFields() throws BackingStoreException {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = new MockAbstractPreferences(pref, "newNode");
+        assertFalse(p.getNewNode());
+        assertSame(p.getLock().getClass(), Object.class);
+
+        p = (MockAbstractPreferences) pref.node("child");
+        assertTrue(p.getNewNode());
+
+        p = (MockAbstractPreferences) ((MockAbstractPreferences) pref)
+        .publicChildSpi("child2");
+        assertTrue(p.getNewNode());
+    }
+
+    public void testToString() {
+        assertEquals("User Preference Node: " + pref.absolutePath(), pref
+                .toString());
+
+        pref = new MockAbstractPreferences((AbstractPreferences) Preferences
+                .systemRoot(), "mock");
+        assertEquals("System Preference Node: " + pref.absolutePath(), pref
+                .toString());
+    }
+
+    public void testAbsolutePath() {
+        assertEquals("/java/util/prefs/mock", pref.absolutePath());
+
+        pref = new MockAbstractPreferences(pref, " ");
+        assertEquals("/java/util/prefs/mock/ ", pref.absolutePath());
+    }
+
+    public void testChildrenNames() throws BackingStoreException {
+        assertEquals(0, pref.childrenNames().length);
+
+        // MockAbstractPreferences child1 = new MockAbstractPreferences(pref,
+        // "child1");
+        // MockAbstractPreferences child2 = new MockAbstractPreferences(pref,
+        // "child2");
+        // MockAbstractPreferences child3 = new MockAbstractPreferences(pref,
+        // "child3");
+        // MockAbstractPreferences subchild1 = new
+        // MockAbstractPreferences(child1,
+        // "subchild1");
+        Preferences child1 = pref.node("child1");
 
         pref.node("child2");
-		pref.node("child3");
-		child1.node("subchild1");
+        pref.node("child3");
+        child1.node("subchild1");
 
         assertSame(pref, child1.parent());
-		assertEquals(3, pref.childrenNames().length);
-	}
+        assertEquals(3, pref.childrenNames().length);
+    }
 
-	public void testClear() throws BackingStoreException {
-		pref.put("testClearKey", "testClearValue");
-		pref.put("testClearKey1", "testClearValue1");
-		assertEquals("testClearValue", pref.get("testClearKey", null));
-		assertEquals("testClearValue1", pref.get("testClearKey1", null));
-		pref.clear();
-		assertNull(pref.get("testClearKey", null));
-		assertNull(pref.get("testClearKey1", null));
-	}
-
-	public void testGet() throws BackingStoreException {
-		assertNull(pref.get("", null));
-		assertEquals("default", pref.get("key", "default"));
-		assertNull(pref.get("key", null));
-		pref.put("testGetkey", "value");
-		assertNull(pref.get("testGetKey", null));
-		assertEquals("value", pref.get("testGetkey", null));
-
-		try {
-			pref.get(null, "abc");
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.get("", "abc");
-		pref.get("key", null);
-		pref.get("key", "");
-		pref.putFloat("floatKey", 1.0f);
-		assertEquals("1.0", pref.get("floatKey", null));
-
-		pref.removeNode();
-		try {
-			pref.get("key", "abc");
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.get(null, "abc");
-			fail();
-		} catch (NullPointerException e) {
-		}
-	}
-
-	public void testGetBoolean() {
-		try {
-			pref.getBoolean(null, false);
-			fail();
-		} catch (NullPointerException e) {
-		}
-
-		pref.put("testGetBooleanKey", "false");
-		pref.put("testGetBooleanKey2", "value");
-		assertFalse(pref.getBoolean("testGetBooleanKey", true));
-		assertTrue(pref.getBoolean("testGetBooleanKey2", true));
-	}
-
-	public void testPutByteArray() {
-		try {
-			pref.putByteArray(null, new byte[0]);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			pref.putByteArray("testPutByteArrayKey4", null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-
-		pref.putByteArray(longKey, new byte[0]);
-		try {
-			pref.putByteArray(longKey + "a", new byte[0]);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		byte[] longArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.74)];
-		byte[] longerArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.75) + 1];
-		pref.putByteArray(longKey, longArray);
-		try {
-			pref.putByteArray(longKey, longerArray);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-
-		pref.putByteArray("testPutByteArrayKey", new byte[0]);
-		assertEquals("", pref.get("testPutByteArrayKey", null));
-		assertTrue(Arrays.equals(new byte[0], pref.getByteArray(
-				"testPutByteArrayKey", null)));
-
-		pref.putByteArray("testPutByteArrayKey3", new byte[] { 'a', 'b', 'c' });
-		assertEquals("YWJj", pref.get("testPutByteArrayKey3", null));
-		assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
-				.getByteArray("testPutByteArrayKey3", null)));
-	}
-
-	public void testGetByteArray() throws UnsupportedEncodingException {
-		try {
-			pref.getByteArray(null, new byte[0]);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		byte[] b64Array = new byte[] { 0x59, 0x57, 0x4a, 0x6a };// BASE64
-																// encoding for
-																// "abc"
-
-		pref.put("testGetByteArrayKey", "abc=");
-		pref.put("testGetByteArrayKey2", new String(b64Array));
-		pref.put("invalidKey", "<>?");
-		// assertTrue(Arrays.equals(new byte[0], p.getByteArray(
-		// "testGetByteArrayKey", new byte[0])));
-		assertTrue(Arrays.equals(new byte[] { 105, -73 }, pref.getByteArray(
-				"testGetByteArrayKey", new byte[0])));
-		assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
-				.getByteArray("testGetByteArrayKey2", new byte[0])));
-		assertTrue(Arrays.equals(new byte[0], pref.getByteArray("invalidKey",
-				new byte[0])));
-
-		pref.putByteArray("testGetByteArrayKey3", b64Array);
-		pref.putByteArray("testGetByteArrayKey4", "abc".getBytes());
-		assertTrue(Arrays.equals(b64Array, pref.getByteArray(
-				"testGetByteArrayKey3", new byte[0])));
-		assertTrue(Arrays.equals("abc".getBytes(), pref.getByteArray(
-				"testGetByteArrayKey4", new byte[0])));
-	}
-
-	public void testGetDouble() {
-		try {
-			pref.getDouble(null, 0);
-			fail();
-		} catch (NullPointerException e) {
-		}
-
-		pref.put("testGetDoubleKey", "1");
-		pref.put("testGetDoubleKey2", "value");
-		pref.putDouble("testGetDoubleKey3", 1);
-		pref.putInt("testGetDoubleKey4", 1);
-		assertEquals(1.0, pref.getDouble("testGetDoubleKey", 0.0), 0);
-		assertEquals(0.0, pref.getDouble("testGetDoubleKey2", 0.0), 0);
-		assertEquals(1.0, pref.getDouble("testGetDoubleKey3", 0.0), 0);
-		assertEquals(1.0, pref.getDouble("testGetDoubleKey4", 0.0), 0);
-	}
-
-	public void testGetFloat() {
-		try {
-			pref.getFloat(null, 0f);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.put("testGetFloatKey", "1");
-		pref.put("testGetFloatKey2", "value");
-		assertEquals(1f, pref.getFloat("testGetFloatKey", 0f), 0); //$NON-NLS-1$
-		assertEquals(0f, pref.getFloat("testGetFloatKey2", 0f), 0);
-	}
-
-	public void testGetInt() {
-		try {
-			pref.getInt(null, 0);
-			fail();
-		} catch (NullPointerException e) {
-		}
-
-		pref.put("testGetIntKey", "1");
-		pref.put("testGetIntKey2", "value");
-		assertEquals(1, pref.getInt("testGetIntKey", 0));
-		assertEquals(0, pref.getInt("testGetIntKey2", 0));
-	}
-
-	public void testGetLong() {
-		try {
-			pref.getLong(null, 0);
-			fail();
-		} catch (NullPointerException e) {
-		}
-
-		pref.put("testGetLongKey", "1");
-		pref.put("testGetLongKey2", "value");
-		assertEquals(1, pref.getInt("testGetLongKey", 0));
-		assertEquals(0, pref.getInt("testGetLongKey2", 0));
-	}
-
-	public void testIsUserNode() {
-		assertTrue(pref.isUserNode());
-
-		pref = new MockAbstractPreferences((AbstractPreferences) Preferences
-				.systemRoot(), "mock");
-		assertFalse(pref.isUserNode());
-	}
-
-	// TODO, how to test the "stored defaults"
-	// TODO, how to test the multi-thread
-	public void testKeys() throws BackingStoreException {
-		assertEquals(0, pref.keys().length);
-
-		pref.put("key0", "value");
-		pref.put("key1", "value1");
-		pref.put("key2", "value2");
-		pref.put("key3", "value3");
-
-		String[] keys = pref.keys();
-		assertEquals(4, keys.length);
-		for (int i = 0; i < keys.length; i++) {
-			assertEquals(0, keys[i].indexOf("key"));
-			assertEquals(4, keys[i].length());
-		}
-	}
-
-	public void testName() {
-		assertEquals("mock", pref.name());
-
-		pref = new MockAbstractPreferences(pref, " ");
-		assertEquals(" ", pref.name());
-	}
-
-	public void testCharCase() throws BackingStoreException {
-		assertSame(pref.node("samechild"), pref.node("samechild"));
-		assertNotSame(pref.node("sameChild"), pref.node("samechild"));
-		assertNotSame(pref.node("child"), pref.node("Child"));
-		assertNotSame(pref.node("child"), pref.node("Child"));
-		assertNotSame(pref.node("child"), pref.node(" child"));
-		String[] names = pref.childrenNames();
-		assertEquals(5, names.length);
-		for (int i = 0; i < names.length; i++) {
-			String name = names[i];
-			assertTrue("samechild".equals(name) || "sameChild".equals(name)
-					|| "child".equals(name) || "Child".equals(name)
-					|| " child".equals(name));
-		}
-
-		Preferences mock1 = pref.node("mock1");
-		mock1.put("key", "1value");
-		mock1.put("KEY", "2value");
-		mock1.put("/K/E/Y", "7value");
-		mock1.put("/K/E\\Y\\abc~@!#$%^&*(\\", "8value");
-
-		assertEquals("8value", mock1.get("/K/E\\Y\\abc~@!#$%^&*(\\", null));
-		assertNull(mock1.get("/k/e/y", null));
-		assertEquals("7value", mock1.get("/K/E/Y", null));
-		assertEquals("1value", mock1.get("key", null));
-
-		String[] keys = mock1.keys();
-		assertEquals(4, keys.length);
-		for (int i = 0; i < keys.length; i++) {
-			String key = keys[i];
-			assertTrue("key".equals(key) || "KEY".equals(key)
-					|| "/K/E/Y".equals(key)
-					|| "/K/E\\Y\\abc~@!#$%^&*(\\".equals(key));
-		}
-	}
-
-	public void testNode() throws BackingStoreException {
-		try {
-			pref.node(null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			pref.node("/java/util/prefs/");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref.node("/java//util/prefs");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref.node(longName + "a");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		assertNotNull(pref.node(longName));
-
-		assertSame(root, pref.node("/"));
-
-		Preferences prefs = pref.node("/java/util/prefs");
-		assertSame(prefs, parent);
-
-		assertSame(pref, pref.node(""));
-
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences child = (MockAbstractPreferences) ((MockAbstractPreferences) pref)
-				.publicChildSpi("child");
-		assertSame(child, pref.node("child"));
-
-		Preferences child2 = pref.node("child2");
-		assertSame(child2, ((MockAbstractPreferences) pref)
-				.publicChildSpi("child2"));
-
-		Preferences grandchild = pref.node("child/grandchild");
-		assertSame(grandchild, child.childSpi("grandchild"));
-		assertSame(grandchild, child.cachedChildrenImpl()[0]);
-		grandchild.removeNode();
-		assertNotSame(grandchild, pref.node("child/grandchild"));
-
-		grandchild = pref.node("child3/grandchild");
-		AbstractPreferences[] childs = ((MockAbstractPreferences) pref)
-				.cachedChildrenImpl();
-		Preferences child3 = child;
-		for (int i = 0; i < childs.length; i++) {
-			if (childs[i].name().equals("child3")) {
-				child3 = childs[i];
-				break;
-			}
-		}
-		assertSame(child3, grandchild.parent());
-	}
-
-	public void testNodeExists() throws BackingStoreException {
-		try {
-			pref.nodeExists(null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			pref.nodeExists("/java/util/prefs/");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref.nodeExists("/java//util/prefs");
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-
-		assertTrue(pref.nodeExists("/"));
-
-		assertTrue(pref.nodeExists("/java/util/prefs"));
-
-		assertTrue(pref.nodeExists(""));
-
-		assertFalse(pref.nodeExists("child"));
-		Preferences grandchild = pref.node("child/grandchild");
-		assertTrue(pref.nodeExists("child"));
-		assertTrue(pref.nodeExists("child/grandchild"));
-		grandchild.removeNode();
-		assertTrue(pref.nodeExists("child"));
-		assertFalse(pref.nodeExists("child/grandchild"));
-		assertFalse(grandchild.nodeExists(""));
-
-		assertFalse(pref.nodeExists("child2/grandchild"));
-		pref.node("child2/grandchild");
-		assertTrue(pref.nodeExists("child2/grandchild"));
-	}
-
-	public void testParent() {
-		assertSame(parent, pref.parent());
-		AbstractPreferences child1 = new MockAbstractPreferences(pref, "child1");
-		assertSame(pref, child1.parent());
-		assertNull(root.parent());
-	}
-
-	public void testPut() throws BackingStoreException {
-		pref.put("", "emptyvalue");
-		assertEquals("emptyvalue", pref.get("", null));
-		pref.put("testPutkey", "value1");
-		assertEquals("value1", pref.get("testPutkey", null));
-		pref.put("testPutkey", "value2");
-		assertEquals("value2", pref.get("testPutkey", null));
-
-		pref.put("", "emptyvalue");
-		assertEquals("emptyvalue", pref.get("", null));
-
-		try {
-			pref.put(null, "value");
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			pref.put("key", null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.put(longKey, longValue);
-		try {
-			pref.put(longKey + 1, longValue);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref.put(longKey, longValue + 1);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-
-		pref.removeNode();
-		try {
-			pref.put(longKey, longValue + 1);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-
-		try {
-			pref.put(longKey, longValue);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-	}
-
-	public void testPutBoolean() {
-		try {
-			pref.putBoolean(null, false);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.putBoolean(longKey, false);
-		try {
-			pref.putBoolean(longKey + "a", false);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.putBoolean("testPutBooleanKey", false);
-		assertEquals("false", pref.get("testPutBooleanKey", null));
-		assertFalse(pref.getBoolean("testPutBooleanKey", true));
-	}
-
-	public void testPutDouble() {
-		try {
-			pref.putDouble(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.putDouble(longKey, 3);
-		try {
-			pref.putDouble(longKey + "a", 3);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.putDouble("testPutDoubleKey", 3);
-		assertEquals("3.0", pref.get("testPutDoubleKey", null));
-		assertEquals(3, pref.getDouble("testPutDoubleKey", 0), 0);
-	}
-
-	public void testPutFloat() {
-		try {
-			pref.putFloat(null, 3f);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.putFloat(longKey, 3f);
-		try {
-			pref.putFloat(longKey + "a", 3f);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.putFloat("testPutFloatKey", 3f);
-		assertEquals("3.0", pref.get("testPutFloatKey", null));
-		assertEquals(3f, pref.getFloat("testPutFloatKey", 0), 0);
-	}
-
-	public void testPutInt() {
-		try {
-			pref.putInt(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.putInt(longKey, 3);
-		try {
-			pref.putInt(longKey + "a", 3);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.putInt("testPutIntKey", 3);
-		assertEquals("3", pref.get("testPutIntKey", null));
-		assertEquals(3, pref.getInt("testPutIntKey", 0));
-	}
-
-	public void testPutLong() {
-		try {
-			pref.putLong(null, 3L);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		pref.putLong(longKey, 3L);
-		try {
-			pref.putLong(longKey + "a", 3L);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.putLong("testPutLongKey", 3L);
-		assertEquals("3", pref.get("testPutLongKey", null));
-		assertEquals(3L, pref.getLong("testPutLongKey", 0));
-	}
-
-	public void testRemove() throws BackingStoreException {
-		pref.remove("key");
-
-		pref.put("key", "value");
-		assertEquals("value", pref.get("key", null));
-		pref.remove("key");
-		assertNull(pref.get("key", null));
-
-		pref.remove("key");
-
-		try {
-			pref.remove(null);
-		} catch (NullPointerException e) {
-		}
-
-		pref.removeNode();
-		try {
-			pref.remove("key");
-			fail();
-		} catch (IllegalStateException e) {
-		}
-	}
-
-	public void testRemoveNode() throws BackingStoreException {
-		Preferences child = pref.node("child");
-		Preferences child1 = pref.node("child1");
-		Preferences grandchild = child.node("grandchild");
-
-		pref.removeNode();
-
-		assertFalse(child.nodeExists(""));
-		assertFalse(child1.nodeExists(""));
-		assertFalse(grandchild.nodeExists(""));
-		assertFalse(pref.nodeExists(""));
-	}
-
-	// public void testAddNodeChangeListener() throws BackingStoreException {
-	// try {
-	// pref.addNodeChangeListener(null);
-	// fail();
-	// } catch (NullPointerException e) {
-	// }
-	//
-	// Preferences child1 = null;
-	// Preferences child2 = null;
-	// Preferences child3 = null;
-	// //To get existed node doesn't create the change event
-	// try {
-	// nl = new MockNodeChangeListener();
-	// pref.addNodeChangeListener(nl);
-	// child1 = pref.node("mock1");
-	// assertEquals(1, nl.getAdded());
-	// nl.reset();
-	// child2 = pref.node("mock1");
-	// assertEquals(0, nl.getAdded());
-	// nl.reset();
-	// } finally {
-	// pref.removeNodeChangeListener(nl);
-	// child1.removeNode();
-	// }
-	// //same listener can be added twice, and must be removed twice
-	// try {
-	// nl = new MockNodeChangeListener();
-	// pref.addNodeChangeListener(nl);
-	// pref.addNodeChangeListener(nl);
-	// child1 = pref.node("mock2");
-	// assertEquals(2, nl.getAdded());
-	// nl.reset();
-	// } finally {
-	// pref.removeNodeChangeListener(nl);
-	// pref.removeNodeChangeListener(nl);
-	// child1.removeNode();
-	// }
-	// //test remove event
-	// try {
-	// nl = new MockNodeChangeListener();
-	// pref.addNodeChangeListener(nl);
-	// child1 = pref.node("mock3");
-	// child1.removeNode();
-	// assertEquals(1, nl.getRemoved());
-	// nl.reset();
-	// } finally {
-	// pref.removeNodeChangeListener(nl);
-	// }
-	// // test remove event with two listeners
-	// try {
-	// nl = new MockNodeChangeListener();
-	// pref.addNodeChangeListener(nl);
-	// pref.addNodeChangeListener(nl);
-	// child1 = pref.node("mock6");
-	// child1.removeNode();
-	// assertEquals(2, nl.getRemoved());
-	// nl.reset();
-	// } finally {
-	// pref.removeNodeChangeListener(nl);
-	// pref.removeNodeChangeListener(nl);
-	// }
-	// //test add/remove indirect children, or remove several children at the
-	// same time
-	// try {
-	// nl = new MockNodeChangeListener();
-	// child1 = pref.node("mock4");
-	// child1.addNodeChangeListener(nl);
-	// child2 = pref.node("mock4/mock5");
-	// assertEquals(1, nl.getAdded());
-	// nl.reset();
-	// child3 = pref.node("mock4/mock5/mock6");
-	// assertEquals(0, nl.getAdded());
-	// nl.reset();
-	//
-	// child3.removeNode();
-	// assertEquals(0, nl.getRemoved());
-	// nl.reset();
-	//
-	// child3 = pref.node("mock4/mock7");
-	// assertEquals(1, nl.getAdded());
-	// nl.reset();
-	//
-	// child1.removeNode();
-	// assertEquals(2, nl.getRemoved());
-	// nl.reset();
-	// } finally {
-	// try {
-	// child1.removeNode();
-	// } catch (Exception e) {
-	// }
-	// }
-	//
-	// }
-
-	public void testAddPreferenceChangeListener() {
-		// TODO: start from here
-
-	}
-
-	public void testRemoveNodeChangeListener() {
-		try {
-			pref.removeNodeChangeListener(null);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		MockNodeChangeListener l1 = new MockNodeChangeListener();
-		MockNodeChangeListener l2 = new MockNodeChangeListener();
-		pref.addNodeChangeListener(l1);
-		pref.addNodeChangeListener(l1);
-
-		pref.removeNodeChangeListener(l1);
-		pref.removeNodeChangeListener(l1);
-		try {
-			pref.removeNodeChangeListener(l1);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		try {
-			pref.removeNodeChangeListener(l2);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-	}
-
-	public void testRemovePreferenceChangeListener() {
-		try {
-			pref.removePreferenceChangeListener(null);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		MockPreferenceChangeListener l1 = new MockPreferenceChangeListener();
-		MockPreferenceChangeListener l2 = new MockPreferenceChangeListener();
-		pref.addPreferenceChangeListener(l1);
-		pref.addPreferenceChangeListener(l1);
-		try {
-			pref.removePreferenceChangeListener(l2);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-		pref.removePreferenceChangeListener(l1);
-		pref.removePreferenceChangeListener(l1);
-		try {
-			pref.removePreferenceChangeListener(l1);
-			fail();
-		} catch (IllegalArgumentException e) {
-		}
-
-	}
-
-	public void testSync() throws BackingStoreException {
-		pref.sync();
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.resetSyncTimes();
-		p.sync();
-		assertEquals(1, p.getSyncTimes());
-
-		p.resetSyncTimes();
-		MockAbstractPreferences child = (MockAbstractPreferences) p
-				.node("child");
-		MockAbstractPreferences child2 = new MockAbstractPreferences(p,
-				"child2");
-		p.childs.put("child2", child2);
-		assertEquals(1, p.cachedChildrenImpl().length);
-		assertSame(child, p.cachedChildrenImpl()[0]);
-		p.sync();
-		assertEquals(1, p.getSyncTimes());
-		assertEquals(1, child.getSyncTimes());
-		assertEquals(0, child2.getSyncTimes());
-
-		p.resetSyncTimes();
-		child.resetSyncTimes();
-		child.sync();
-		assertEquals(0, p.getSyncTimes());
-		assertEquals(1, child.getSyncTimes());
-
-		p.resetSyncTimes();
-		child.resetSyncTimes();
-		MockAbstractPreferences grandson = (MockAbstractPreferences) child
-				.node("grandson");
-		child.sync();
-		assertEquals(0, p.getSyncTimes());
-		assertEquals(1, child.getSyncTimes());
-		assertEquals(1, grandson.getSyncTimes());
-	}
-
-	public void testFlush() throws BackingStoreException {
-		pref.flush();
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.resetFlushedTimes();
-		p.flush();
-		assertEquals(1, p.getFlushedTimes());
-
-		p.resetFlushedTimes();
-		MockAbstractPreferences child = (MockAbstractPreferences) p
-				.node("child");
-		MockAbstractPreferences child2 = new MockAbstractPreferences(p,
-				"child2");
-		p.childs.put("child2", child2);
-		assertEquals(1, p.cachedChildrenImpl().length);
-		assertSame(child, p.cachedChildrenImpl()[0]);
-		p.flush();
-		assertEquals(1, p.getFlushedTimes());
-		assertEquals(1, child.getFlushedTimes());
-		assertEquals(0, child2.getFlushedTimes());
-
-		p.resetFlushedTimes();
-		child.resetFlushedTimes();
-		child.flush();
-		assertEquals(0, p.getFlushedTimes());
-		assertEquals(1, child.getFlushedTimes());
-
-		p.resetFlushedTimes();
-		child.resetFlushedTimes();
-		MockAbstractPreferences grandson = (MockAbstractPreferences) child
-				.node("grandson");
-		child.flush();
-		assertEquals(0, p.getFlushedTimes());
-		assertEquals(1, child.getFlushedTimes());
-		assertEquals(1, grandson.getFlushedTimes());
-
-		p.resetFlushedTimes();
-		child.resetFlushedTimes();
-		grandson.resetFlushedTimes();
-		child.removeNode();
-		child.flush();
-		assertEquals(0, p.getFlushedTimes());
-		assertEquals(1, child.getFlushedTimes());
-		assertEquals(0, grandson.getFlushedTimes());
-	}
-
-	public void testGetChild() throws BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		assertNull(p.getChildImpl("child"));
-		MockAbstractPreferences child = new MockAbstractPreferences(p, "child");
-		p.childs.put("child", child);
-		assertSame(child, p.getChildImpl("child"));
-		assertNull(p.getChildImpl("child "));
-
-		assertNull(p.getChildImpl("child/grandson"));
-		child.childs.put("grandson", new MockAbstractPreferences(child,
-				"grandson"));
-		assertNull(p.getChildImpl("child/grandson"));
-
-		assertNull(p.getChildImpl(null));
-		assertNull(p.getChildImpl(""));
-		assertNull(p.getChildImpl(" "));
-		assertNull(p.getChildImpl("abc//abc"));
-		assertNull(p.getChildImpl("child/"));
-		assertNull(p.getChildImpl(longName + "a"));
-
-		child.removeNode();
-		assertNull(p.getChildImpl("child"));
-	}
-
-	public void testIsRemoved() throws BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		assertFalse(p.isRemovedImpl());
-		p.removeNode();
-		assertTrue(p.isRemovedImpl());
-	}
-
-	public void testExportNode() throws Exception {
-		try {
-			pref.exportNode(null);
-			fail();
-		} catch (NullPointerException e) {
-			// Expected
-		}
-
-		pref.putBoolean("key", false);
-		Preferences child = pref.node("child<");
-		child.put("key2", "value2<");
-		Preferences grandson = child.node("grandson");
-		grandson.put("key3", "value3");
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		child.exportNode(out);
-
-		byte[] result = out.toByteArray();
-		ByteArrayInputStream in = new ByteArrayInputStream(result);
-
-		Document doc = parseXmlStream(in, true);
-
-		// only output this node without parent and children
-		String rootpath = "/preferences[@EXTERNAL_XML_VERSION='1.0']/root[@type='user']/node[@name='java']/node[@name='util']/node[@name='prefs']";
-		Node node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/map/entry[@key='key' and @value='false']");
-		assertNull(node);
-		node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/node[@name='child<']/map/entry[@key='key2' and @value='value2<']");
-		assertNotNull(node);
-		node = XPathAPI.selectSingleNode(doc, rootpath
-				+ "/node[@name='mock']/node[@name='child']/node");
-		assertNull(node);
-	}
-
-	private static Document parseXmlStream(InputStream input, boolean validating)
-			throws SAXException, IOException, ParserConfigurationException {
-		// Create a builder factory
-		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
-		factory.setValidating(validating);
-
-		// Create the builder and parse the file
-		DocumentBuilder builder = factory.newDocumentBuilder();
-		Document doc = builder.parse(input);
-		return doc;
-	}
-
-	public void testExportSubtree() throws Exception {
-		try {
-			pref.exportSubtree(null);
-			fail();
-		} catch (NullPointerException e) {
-			// Expected
-		}
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		pref.putBoolean("key", false);
-		Preferences child = pref.node("child");
-		child.put("key2", "value2");
-		Preferences grandson = child.node("grandson");
-		grandson.put("key3", "value3");
-		child.node("grandson2");
-		Preferences grandgrandson = grandson.node("grandgrandson");
-		grandgrandson.put("key4", "value4");
-		child.exportSubtree(out);
-
-		byte[] result = out.toByteArray();
-		// System.out.println(new String(result, "utf-8"));
-		ByteArrayInputStream in = new ByteArrayInputStream(result);
-		Document doc = parseXmlStream(in, true);
-
-		// only output this node and subtree without parent
-		String rootpath = "/preferences[@EXTERNAL_XML_VERSION='1.0']/root[@type='user']/node[@name='java']/node[@name='util']/node[@name='prefs']";
-		Node node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/map/entry[@key='key' and @value='false']");
-		assertNull(node);
-		node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/node[@name='child']/map/entry[@key='key2' and @value='value2']");
-		assertNotNull(node);
-		node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/node[@name='child']/node[@name='grandson']/map/entry[@key='key3' and @value='value3']");
-		assertNotNull(node);
-		node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/node[@name='child']/node[@name='grandson']/node[@name='grandgrandson']/map/entry[@key='key4' and @value='value4']");
-		assertNotNull(node);
-		node = XPathAPI
-				.selectSingleNode(
-						doc,
-						rootpath
-								+ "/node[@name='mock']/node[@name='child']/node[@name='grandson2']/map");
-		assertNotNull(node);
-	}
-
-	public void testCachedChildren() throws Exception {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		assertEquals(0, p.cachedChildrenImpl().length);
-
-		MockAbstractPreferences child = (MockAbstractPreferences) p
-				.getChildImpl("child");
-		assertNull(child);
-
-		child = new MockAbstractPreferences(p, "child");
-		assertSame(child, p.getChildImpl("child"));
-
-		assertEquals(0, p.cachedChildrenImpl().length);
-
-		p.node("child");
-		assertSame(child, p.cachedChildrenImpl()[0]);
-
-		MockAbstractPreferences grandchild = new MockAbstractPreferences(child,
-				"grandchild");
-		assertSame(grandchild, child.getChildImpl("grandchild"));
-		assertNull(p.getChildImpl("grandchild"));
-
-		assertEquals(1, p.cachedChildrenImpl().length);
-		assertEquals(0, child.cachedChildrenImpl().length);
-
-		p.node("child/grandchild");
-		assertSame(child, p.cachedChildrenImpl()[0]);
-		assertSame(grandchild, child.cachedChildrenImpl()[0]);
-		assertEquals(1, p.cachedChildrenImpl().length);
-		assertEquals(1, child.cachedChildrenImpl().length);
-
-		p.childs.put("child2", new MockAbstractPreferences(p, "child2"));
-		p.nodeExists("child2/grandchild");
-		assertSame(child, p.cachedChildrenImpl()[0]);
-		assertSame(grandchild, child.cachedChildrenImpl()[0]);
-		assertEquals(1, p.cachedChildrenImpl().length);
-		assertEquals(1, child.cachedChildrenImpl().length);
-	}
-
-	public void testAbstractMethod() {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		((MockAbstractPreferences) pref).protectedAbstractMethod();
-	}
-
-	public Object invokeNonPublicMethod(AbstractPreferences obj, String name,
-			Class[] params, Object[] paramValues) throws SecurityException,
-			NoSuchMethodException, IllegalArgumentException,
-			IllegalAccessException, InvocationTargetException {
-		Method method = obj.getClass().getMethod(name, params);
-		method.setAccessible(true);
-		return method.invoke(obj, paramValues);
-	}
-
-	public void testBackingStoreException() throws IOException,
-			BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.setResult(MockAbstractPreferences.backingException);
-		try {
-			p.childrenNames();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.put("exceptionkey", "value");
-		p.absolutePath();
-		p.toString();
-		assertEquals("exception default", p.get("key", "exception default"));
-		p.remove("key");
-		try {
-			p.clear();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.putInt("key", 3);
-		p.getInt("key", 3);
-		p.putLong("key", 3l);
-		p.getLong("key", 3l);
-		p.putDouble("key", 3);
-		p.getDouble("key", 3);
-		p.putBoolean("key", true);
-		p.getBoolean("key", true);
-		p.putFloat("key", 3f);
-		p.getFloat("key", 3f);
-		p.putByteArray("key", new byte[0]);
-		p.getByteArray("key", new byte[0]);
-		try {
-			p.keys();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-
-		try {
-			p.keys();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		try {
-			p.childrenNames();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.parent();
-		p.node("");
-		p.nodeExists("");
-		try {
-			p.removeNode();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.name();
-		p.absolutePath();
-		p.isUserNode();
-		MockPreferenceChangeListener mockPreferenceChangeListener = new MockPreferenceChangeListener();
-		p.addPreferenceChangeListener(mockPreferenceChangeListener);
-		p.removePreferenceChangeListener(mockPreferenceChangeListener);
-		MockNodeChangeListener mockNodeChangeListener = new MockNodeChangeListener();
-		p.addNodeChangeListener(mockNodeChangeListener);
-		p.removeNodeChangeListener(mockNodeChangeListener);
-		p.toString();
-		try {
-			p.sync();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		try {
-			p.flush();
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		try {
-			p.exportNode(new ByteArrayOutputStream());
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		try {
-			p.exportSubtree(new ByteArrayOutputStream());
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.isRemovedImpl();
-		try {
-			p.getChildImpl(null);
-			fail();
-		} catch (BackingStoreException e) {
-		}
-		p.cachedChildrenImpl();
-	}
-
-	public void testRuntimeException() throws IOException,
-			BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.setResult(MockAbstractPreferences.runtimeException);
-		try {
-			p.childrenNames();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.put("exceptionkey", "value");
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.absolutePath();
-		p.toString();
-		assertEquals("exception default", p.get("key", "exception default"));
-		try {
-			p.remove("key");
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.clear();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.putInt("key", 3);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getInt("key", 3);
-		try {
-			p.putLong("key", 3l);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getLong("key", 3l);
-		try {
-			p.putDouble("key", 3);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getDouble("key", 3);
-		try {
-			p.putBoolean("key", true);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getBoolean("key", true);
-		try {
-			p.putFloat("key", 3f);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getFloat("key", 3f);
-		try {
-			p.putByteArray("key", new byte[0]);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.getByteArray("key", new byte[0]);
-		try {
-			p.keys();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.keys();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.childrenNames();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.parent();
-		p.node("");
-		p.nodeExists("");
-		try {
-			p.removeNode();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.name();
-		p.absolutePath();
-		p.isUserNode();
-		MockPreferenceChangeListener pcl = new MockPreferenceChangeListener();
-		p.addPreferenceChangeListener(pcl);
-		p.removePreferenceChangeListener(pcl);
-		MockNodeChangeListener ncl = new MockNodeChangeListener();
-		p.addNodeChangeListener(ncl);
-		p.removeNodeChangeListener(ncl);
-		p.toString();
-		try {
-			p.sync();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.flush();
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.exportNode(new ByteArrayOutputStream());
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		try {
-			p.exportSubtree(new ByteArrayOutputStream());
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.isRemovedImpl();
-		try {
-			p.getChildImpl(null);
-			fail();
-		} catch (MockRuntimeException e) {
-		}
-		p.cachedChildrenImpl();
-	}
-
-	public void testSPIReturnNull() throws IOException, BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.setResult(MockAbstractPreferences.returnNull);
-		try {
-			p.childrenNames();
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.absolutePath();
-		p.toString();
-		p.put("nullkey", "value");
-		assertEquals("null default", p.get("key", "null default"));
-		p.remove("key");
-		try {
-			p.clear();
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.putInt("key", 3);
-		p.getInt("key", 3);
-		p.putLong("key", 3l);
-		p.getLong("key", 3l);
-		p.putDouble("key", 3);
-		p.getDouble("key", 3);
-		p.putBoolean("key", true);
-		p.getBoolean("key", true);
-		p.putFloat("key", 3f);
-		p.getFloat("key", 3f);
-		p.putByteArray("key", new byte[0]);
-		p.getByteArray("key", new byte[0]);
-		p.keys();
-		try {
-			p.childrenNames();
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.parent();
-		p.node("");
-		p.nodeExists("");
-		try {
-			p.removeNode();
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.name();
-		p.absolutePath();
-		p.isUserNode();
-		MockPreferenceChangeListener mockPreferenceChangeListener = new MockPreferenceChangeListener();
-		p.addPreferenceChangeListener(mockPreferenceChangeListener);
-		p.removePreferenceChangeListener(mockPreferenceChangeListener);
-		MockNodeChangeListener mockNodeChangeListener = new MockNodeChangeListener();
-		p.addNodeChangeListener(mockNodeChangeListener);
-		p.removeNodeChangeListener(mockNodeChangeListener);
-		p.toString();
-		p.sync();
-		p.flush();
-		try {
-			p.exportNode(System.out);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.exportSubtree(System.out);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.isRemovedImpl();
-		try {
-			p.getChildImpl("");
-			fail();
-		} catch (NullPointerException e) {
-		}
-		p.cachedChildrenImpl();
-	}
-
-	public void testIllegalStateException() throws IOException,
-			BackingStoreException {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		pref.removeNode();
-		// after remove node, every methods, except name(), absolutePath(),
-		// isUserNode(), flush() or nodeExists(""),
-		// will throw illegal state exception
-		pref.nodeExists("");
-		pref.name();
-		pref.absolutePath();
-		pref.isUserNode();
-		pref.toString();
-		pref.flush();
-		try {
-			pref.nodeExists("child");
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.childrenNames();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.remove(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.clear();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.get("key", "null default");
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.put("nullkey", "value");
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putInt("key", 3);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getInt("key", 3);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putLong("key", 3l);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getLong("key", 3l);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putDouble("key", 3);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getDouble("key", 3);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putBoolean("key", true);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getBoolean("key", true);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putFloat("key", 3f);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getFloat("key", 3f);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.putByteArray("key", new byte[0]);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.getByteArray("key", new byte[0]);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.keys();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.keys();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.childrenNames();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.parent();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.node(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.removeNode();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref
-					.addPreferenceChangeListener(new MockPreferenceChangeListener());
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref
-					.removePreferenceChangeListener(new MockPreferenceChangeListener());
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.addNodeChangeListener(new MockNodeChangeListener());
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.removeNodeChangeListener(new MockNodeChangeListener());
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.sync();
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.exportNode(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			pref.exportSubtree(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.isRemovedImpl();
-		p.cachedChildrenImpl();
-		try {
-			p.getChildImpl(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-	}
-
-	public void testNullAndIllegalStateException() throws Exception {
-		if (!(pref instanceof MockAbstractPreferences)) {
-			return;
-		}
-		MockAbstractPreferences p = (MockAbstractPreferences) pref;
-		p.removeNode();
-		try {
-			p.get(null, "null default");
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.put(null, "value");
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putInt(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getInt(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putLong(null, 3l);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getLong(null, 3l);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putDouble(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getDouble(null, 3);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putBoolean(null, true);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getBoolean(null, true);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putFloat(null, 3f);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getFloat(null, 3f);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.putByteArray(null, new byte[0]);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.getByteArray(null, new byte[0]);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.addPreferenceChangeListener(null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.removePreferenceChangeListener(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-		try {
-			p.addNodeChangeListener(null);
-			fail();
-		} catch (NullPointerException e) {
-		}
-		try {
-			p.removeNodeChangeListener(null);
-			fail();
-		} catch (IllegalStateException e) {
-		}
-	}
+    public void testClear() throws BackingStoreException {
+        pref.put("testClearKey", "testClearValue");
+        pref.put("testClearKey1", "testClearValue1");
+        assertEquals("testClearValue", pref.get("testClearKey", null));
+        assertEquals("testClearValue1", pref.get("testClearKey1", null));
+        pref.clear();
+        assertNull(pref.get("testClearKey", null));
+        assertNull(pref.get("testClearKey1", null));
+    }
+
+    public void testGet() throws BackingStoreException {
+        assertNull(pref.get("", null));
+        assertEquals("default", pref.get("key", "default"));
+        assertNull(pref.get("key", null));
+        pref.put("testGetkey", "value");
+        assertNull(pref.get("testGetKey", null));
+        assertEquals("value", pref.get("testGetkey", null));
+
+        try {
+            pref.get(null, "abc");
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.get("", "abc");
+        pref.get("key", null);
+        pref.get("key", "");
+        pref.putFloat("floatKey", 1.0f);
+        assertEquals("1.0", pref.get("floatKey", null));
+
+        pref.removeNode();
+        try {
+            pref.get("key", "abc");
+            fail();
+        } catch (IllegalStateException e) {
+        }
+        try {
+            pref.get(null, "abc");
+            fail();
+        } catch (NullPointerException e) {
+        }
+    }
+
+    public void testGetBoolean() {
+        try {
+            pref.getBoolean(null, false);
+            fail();
+        } catch (NullPointerException e) {
+        }
+
+        pref.put("testGetBooleanKey", "false");
+        pref.put("testGetBooleanKey2", "value");
+        assertFalse(pref.getBoolean("testGetBooleanKey", true));
+        assertTrue(pref.getBoolean("testGetBooleanKey2", true));
+    }
+
+    public void testPutByteArray() {
+        try {
+            pref.putByteArray(null, new byte[0]);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        try {
+            pref.putByteArray("testPutByteArrayKey4", null);
+            fail();
+        } catch (NullPointerException e) {
+        }
+
+        pref.putByteArray(longKey, new byte[0]);
+        try {
+            pref.putByteArray(longKey + "a", new byte[0]);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        byte[] longArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.74)];
+        byte[] longerArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.75) + 1];
+        pref.putByteArray(longKey, longArray);
+        try {
+            pref.putByteArray(longKey, longerArray);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+
+        pref.putByteArray("testPutByteArrayKey", new byte[0]);
+        assertEquals("", pref.get("testPutByteArrayKey", null));
+        assertTrue(Arrays.equals(new byte[0], pref.getByteArray(
+                "testPutByteArrayKey", null)));
+
+        pref.putByteArray("testPutByteArrayKey3", new byte[] { 'a', 'b', 'c' });
+        assertEquals("YWJj", pref.get("testPutByteArrayKey3", null));
+        assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
+                .getByteArray("testPutByteArrayKey3", null)));
+    }
+
+    public void testGetByteArray() throws UnsupportedEncodingException {
+        try {
+            pref.getByteArray(null, new byte[0]);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        byte[] b64Array = new byte[] { 0x59, 0x57, 0x4a, 0x6a };// BASE64
+        // encoding for
+        // "abc"
+
+        pref.put("testGetByteArrayKey", "abc=");
+        pref.put("testGetByteArrayKey2", new String(b64Array));
+        pref.put("invalidKey", "<>?");
+        // assertTrue(Arrays.equals(new byte[0], p.getByteArray(
+        // "testGetByteArrayKey", new byte[0])));
+        assertTrue(Arrays.equals(new byte[] { 105, -73 }, pref.getByteArray(
+                "testGetByteArrayKey", new byte[0])));
+        assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
+                .getByteArray("testGetByteArrayKey2", new byte[0])));
+        assertTrue(Arrays.equals(new byte[0], pref.getByteArray("invalidKey",
+                new byte[0])));
+
+        pref.putByteArray("testGetByteArrayKey3", b64Array);
+        pref.putByteArray("testGetByteArrayKey4", "abc".getBytes());
+        assertTrue(Arrays.equals(b64Array, pref.getByteArray(
+                "testGetByteArrayKey3", new byte[0])));
+        assertTrue(Arrays.equals("abc".getBytes(), pref.getByteArray(
+                "testGetByteArrayKey4", new byte[0])));
+    }
+
+    public void testGetDouble() {
+        try {
+            pref.getDouble(null, 0);
+            fail();
+        } catch (NullPointerException e) {
+        }
+
+        pref.put("testGetDoubleKey", "1");
+        pref.put("testGetDoubleKey2", "value");
+        pref.putDouble("testGetDoubleKey3", 1);
+        pref.putInt("testGetDoubleKey4", 1);
+        assertEquals(1.0, pref.getDouble("testGetDoubleKey", 0.0), 0);
+        assertEquals(0.0, pref.getDouble("testGetDoubleKey2", 0.0), 0);
+        assertEquals(1.0, pref.getDouble("testGetDoubleKey3", 0.0), 0);
+        assertEquals(1.0, pref.getDouble("testGetDoubleKey4", 0.0), 0);
+    }
+
+    public void testGetFloat() {
+        try {
+            pref.getFloat(null, 0f);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.put("testGetFloatKey", "1");
+        pref.put("testGetFloatKey2", "value");
+        assertEquals(1f, pref.getFloat("testGetFloatKey", 0f), 0); //$NON-NLS-1$
+        assertEquals(0f, pref.getFloat("testGetFloatKey2", 0f), 0);
+    }
+
+    public void testGetInt() {
+        try {
+            pref.getInt(null, 0);
+            fail();
+        } catch (NullPointerException e) {
+        }
+
+        pref.put("testGetIntKey", "1");
+        pref.put("testGetIntKey2", "value");
+        assertEquals(1, pref.getInt("testGetIntKey", 0));
+        assertEquals(0, pref.getInt("testGetIntKey2", 0));
+    }
+
+    public void testGetLong() {
+        try {
+            pref.getLong(null, 0);
+            fail();
+        } catch (NullPointerException e) {
+        }
+
+        pref.put("testGetLongKey", "1");
+        pref.put("testGetLongKey2", "value");
+        assertEquals(1, pref.getInt("testGetLongKey", 0));
+        assertEquals(0, pref.getInt("testGetLongKey2", 0));
+    }
+
+    public void testIsUserNode() {
+        assertTrue(pref.isUserNode());
+
+        pref = new MockAbstractPreferences((AbstractPreferences) Preferences
+                .systemRoot(), "mock");
+        assertFalse(pref.isUserNode());
+    }
+
+    // TODO, how to test the "stored defaults"
+    // TODO, how to test the multi-thread
+    public void testKeys() throws BackingStoreException {
+        assertEquals(0, pref.keys().length);
+
+        pref.put("key0", "value");
+        pref.put("key1", "value1");
+        pref.put("key2", "value2");
+        pref.put("key3", "value3");
+
+        String[] keys = pref.keys();
+        assertEquals(4, keys.length);
+        for (int i = 0; i < keys.length; i++) {
+            assertEquals(0, keys[i].indexOf("key"));
+            assertEquals(4, keys[i].length());
+        }
+    }
+
+    public void testName() {
+        assertEquals("mock", pref.name());
+
+        pref = new MockAbstractPreferences(pref, " ");
+        assertEquals(" ", pref.name());
+    }
+
+    public void testCharCase() throws BackingStoreException {
+        assertSame(pref.node("samechild"), pref.node("samechild"));
+        assertNotSame(pref.node("sameChild"), pref.node("samechild"));
+        assertNotSame(pref.node("child"), pref.node("Child"));
+        assertNotSame(pref.node("child"), pref.node("Child"));
+        assertNotSame(pref.node("child"), pref.node(" child"));
+        String[] names = pref.childrenNames();
+        assertEquals(5, names.length);
+        for (int i = 0; i < names.length; i++) {
+            String name = names[i];
+            assertTrue("samechild".equals(name) || "sameChild".equals(name)
+                    || "child".equals(name) || "Child".equals(name)
+                    || " child".equals(name));
+        }
+
+        Preferences mock1 = pref.node("mock1");
+        mock1.put("key", "1value");
+        mock1.put("KEY", "2value");
+        mock1.put("/K/E/Y", "7value");
+        mock1.put("/K/E\\Y\\abc~@!#$%^&*(\\", "8value");
+
+        assertEquals("8value", mock1.get("/K/E\\Y\\abc~@!#$%^&*(\\", null));
+        assertNull(mock1.get("/k/e/y", null));
+        assertEquals("7value", mock1.get("/K/E/Y", null));
+        assertEquals("1value", mock1.get("key", null));
+
+        String[] keys = mock1.keys();
+        assertEquals(4, keys.length);
+        for (int i = 0; i < keys.length; i++) {
+            String key = keys[i];
+            assertTrue("key".equals(key) || "KEY".equals(key)
+                    || "/K/E/Y".equals(key)
+                    || "/K/E\\Y\\abc~@!#$%^&*(\\".equals(key));
+        }
+    }
+
+    public void testNode() throws BackingStoreException {
+        try {
+            pref.node(null);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        try {
+            pref.node("/java/util/prefs/");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref.node("/java//util/prefs");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref.node(longName + "a");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        assertNotNull(pref.node(longName));
+
+        assertSame(root, pref.node("/"));
+
+        Preferences prefs = pref.node("/java/util/prefs");
+        assertSame(prefs, parent);
+
+        assertSame(pref, pref.node(""));
+
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences child = (MockAbstractPreferences) ((MockAbstractPreferences) pref)
+        .publicChildSpi("child");
+        assertSame(child, pref.node("child"));
+
+        Preferences child2 = pref.node("child2");
+        assertSame(child2, ((MockAbstractPreferences) pref)
+                .publicChildSpi("child2"));
+
+        Preferences grandchild = pref.node("child/grandchild");
+        assertSame(grandchild, child.childSpi("grandchild"));
+        assertSame(grandchild, child.cachedChildrenImpl()[0]);
+        grandchild.removeNode();
+        assertNotSame(grandchild, pref.node("child/grandchild"));
+
+        grandchild = pref.node("child3/grandchild");
+        AbstractPreferences[] childs = ((MockAbstractPreferences) pref)
+        .cachedChildrenImpl();
+        Preferences child3 = child;
+        for (int i = 0; i < childs.length; i++) {
+            if (childs[i].name().equals("child3")) {
+                child3 = childs[i];
+                break;
+            }
+        }
+        assertSame(child3, grandchild.parent());
+    }
+
+    public void testNodeExists() throws BackingStoreException {
+        try {
+            pref.nodeExists(null);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        try {
+            pref.nodeExists("/java/util/prefs/");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref.nodeExists("/java//util/prefs");
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+
+        assertTrue(pref.nodeExists("/"));
+
+        assertTrue(pref.nodeExists("/java/util/prefs"));
+
+        assertTrue(pref.nodeExists(""));
+
+        assertFalse(pref.nodeExists("child"));
+        Preferences grandchild = pref.node("child/grandchild");
+        assertTrue(pref.nodeExists("child"));
+        assertTrue(pref.nodeExists("child/grandchild"));
+        grandchild.removeNode();
+        assertTrue(pref.nodeExists("child"));
+        assertFalse(pref.nodeExists("child/grandchild"));
+        assertFalse(grandchild.nodeExists(""));
+
+        assertFalse(pref.nodeExists("child2/grandchild"));
+        pref.node("child2/grandchild");
+        assertTrue(pref.nodeExists("child2/grandchild"));
+    }
+
+    public void testParent() {
+        assertSame(parent, pref.parent());
+        AbstractPreferences child1 = new MockAbstractPreferences(pref, "child1");
+        assertSame(pref, child1.parent());
+        assertNull(root.parent());
+    }
+
+    public void testPut() throws BackingStoreException {
+        pref.put("", "emptyvalue");
+        assertEquals("emptyvalue", pref.get("", null));
+        pref.put("testPutkey", "value1");
+        assertEquals("value1", pref.get("testPutkey", null));
+        pref.put("testPutkey", "value2");
+        assertEquals("value2", pref.get("testPutkey", null));
+
+        pref.put("", "emptyvalue");
+        assertEquals("emptyvalue", pref.get("", null));
+
+        try {
+            pref.put(null, "value");
+            fail();
+        } catch (NullPointerException e) {
+        }
+        try {
+            pref.put("key", null);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.put(longKey, longValue);
+        try {
+            pref.put(longKey + 1, longValue);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref.put(longKey, longValue + 1);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+
+        pref.removeNode();
+        try {
+            pref.put(longKey, longValue + 1);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+
+        try {
+            pref.put(longKey, longValue);
+            fail();
+        } catch (IllegalStateException e) {
+        }
+    }
+
+    public void testPutBoolean() {
+        try {
+            pref.putBoolean(null, false);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.putBoolean(longKey, false);
+        try {
+            pref.putBoolean(longKey + "a", false);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.putBoolean("testPutBooleanKey", false);
+        assertEquals("false", pref.get("testPutBooleanKey", null));
+        assertFalse(pref.getBoolean("testPutBooleanKey", true));
+    }
+
+    public void testPutDouble() {
+        try {
+            pref.putDouble(null, 3);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.putDouble(longKey, 3);
+        try {
+            pref.putDouble(longKey + "a", 3);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.putDouble("testPutDoubleKey", 3);
+        assertEquals("3.0", pref.get("testPutDoubleKey", null));
+        assertEquals(3, pref.getDouble("testPutDoubleKey", 0), 0);
+    }
+
+    public void testPutFloat() {
+        try {
+            pref.putFloat(null, 3f);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.putFloat(longKey, 3f);
+        try {
+            pref.putFloat(longKey + "a", 3f);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.putFloat("testPutFloatKey", 3f);
+        assertEquals("3.0", pref.get("testPutFloatKey", null));
+        assertEquals(3f, pref.getFloat("testPutFloatKey", 0), 0);
+    }
+
+    public void testPutInt() {
+        try {
+            pref.putInt(null, 3);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.putInt(longKey, 3);
+        try {
+            pref.putInt(longKey + "a", 3);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.putInt("testPutIntKey", 3);
+        assertEquals("3", pref.get("testPutIntKey", null));
+        assertEquals(3, pref.getInt("testPutIntKey", 0));
+    }
+
+    public void testPutLong() {
+        try {
+            pref.putLong(null, 3L);
+            fail();
+        } catch (NullPointerException e) {
+        }
+        pref.putLong(longKey, 3L);
+        try {
+            pref.putLong(longKey + "a", 3L);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.putLong("testPutLongKey", 3L);
+        assertEquals("3", pref.get("testPutLongKey", null));
+        assertEquals(3L, pref.getLong("testPutLongKey", 0));
+    }
+
+    public void testRemove() throws BackingStoreException {
+        pref.remove("key");
+
+        pref.put("key", "value");
+        assertEquals("value", pref.get("key", null));
+        pref.remove("key");
+        assertNull(pref.get("key", null));
+
+        pref.remove("key");
+
+        try {
+            pref.remove(null);
+        } catch (NullPointerException e) {
+        }
+
+        pref.removeNode();
+        try {
+            pref.remove("key");
+            fail();
+        } catch (IllegalStateException e) {
+        }
+    }
+
+    public void testRemoveNode() throws BackingStoreException {
+        Preferences child = pref.node("child");
+        Preferences child1 = pref.node("child1");
+        Preferences grandchild = child.node("grandchild");
+
+        pref.removeNode();
+
+        assertFalse(child.nodeExists(""));
+        assertFalse(child1.nodeExists(""));
+        assertFalse(grandchild.nodeExists(""));
+        assertFalse(pref.nodeExists(""));
+    }
+
+    // public void testAddNodeChangeListener() throws BackingStoreException {
+    // try {
+    // pref.addNodeChangeListener(null);
+    // fail();
+    // } catch (NullPointerException e) {
+    // }
+    //
+    // Preferences child1 = null;
+    // Preferences child2 = null;
+    // Preferences child3 = null;
+    // //To get existed node doesn't create the change event
+    // try {
+    // nl = new MockNodeChangeListener();
+    // pref.addNodeChangeListener(nl);
+    // child1 = pref.node("mock1");
+    // assertEquals(1, nl.getAdded());
+    // nl.reset();
+    // child2 = pref.node("mock1");
+    // assertEquals(0, nl.getAdded());
+    // nl.reset();
+    // } finally {
+    // pref.removeNodeChangeListener(nl);
+    // child1.removeNode();
+    // }
+    // //same listener can be added twice, and must be removed twice
+    // try {
+    // nl = new MockNodeChangeListener();
+    // pref.addNodeChangeListener(nl);
+    // pref.addNodeChangeListener(nl);
+    // child1 = pref.node("mock2");
+    // assertEquals(2, nl.getAdded());
+    // nl.reset();
+    // } finally {
+    // pref.removeNodeChangeListener(nl);
+    // pref.removeNodeChangeListener(nl);
+    // child1.removeNode();
+    // }
+    // //test remove event
+    // try {
+    // nl = new MockNodeChangeListener();
+    // pref.addNodeChangeListener(nl);
+    // child1 = pref.node("mock3");
+    // child1.removeNode();
+    // assertEquals(1, nl.getRemoved());
+    // nl.reset();
+    // } finally {
+    // pref.removeNodeChangeListener(nl);
+    // }
+    // // test remove event with two listeners
+    // try {
+    // nl = new MockNodeChangeListener();
+    // pref.addNodeChangeListener(nl);
+    // pref.addNodeChangeListener(nl);
+    // child1 = pref.node("mock6");
+    // child1.removeNode();
+    // assertEquals(2, nl.getRemoved());
+    // nl.reset();
+    // } finally {
+    // pref.removeNodeChangeListener(nl);
+    // pref.removeNodeChangeListener(nl);
+    // }
+    // //test add/remove indirect children, or remove several children at the
+    // same time
+    // try {
+    // nl = new MockNodeChangeListener();
+    // child1 = pref.node("mock4");
+    // child1.addNodeChangeListener(nl);
+    // child2 = pref.node("mock4/mock5");
+    // assertEquals(1, nl.getAdded());
+    // nl.reset();
+    // child3 = pref.node("mock4/mock5/mock6");
+    // assertEquals(0, nl.getAdded());
+    // nl.reset();
+    //
+    // child3.removeNode();
+    // assertEquals(0, nl.getRemoved());
+    // nl.reset();
+    //
+    // child3 = pref.node("mock4/mock7");
+    // assertEquals(1, nl.getAdded());
+    // nl.reset();
+    //
+    // child1.removeNode();
+    // assertEquals(2, nl.getRemoved());
+    // nl.reset();
+    // } finally {
+    // try {
+    // child1.removeNode();
+    // } catch (Exception e) {
+    // }
+    // }
+    //
+    // }
+
+    public void testAddPreferenceChangeListener() {
+        // TODO: start from here
+
+    }
+
+    public void testRemoveNodeChangeListener() {
+        try {
+            pref.removeNodeChangeListener(null);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        MockNodeChangeListener l1 = new MockNodeChangeListener();
+        MockNodeChangeListener l2 = new MockNodeChangeListener();
+        pref.addNodeChangeListener(l1);
+        pref.addNodeChangeListener(l1);
+
+        pref.removeNodeChangeListener(l1);
+        pref.removeNodeChangeListener(l1);
+        try {
+            pref.removeNodeChangeListener(l1);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        try {
+            pref.removeNodeChangeListener(l2);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+    }
+
+    public void testRemovePreferenceChangeListener() {
+        try {
+            pref.removePreferenceChangeListener(null);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        MockPreferenceChangeListener l1 = new MockPreferenceChangeListener();
+        MockPreferenceChangeListener l2 = new MockPreferenceChangeListener();
+        pref.addPreferenceChangeListener(l1);
+        pref.addPreferenceChangeListener(l1);
+        try {
+            pref.removePreferenceChangeListener(l2);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+        pref.removePreferenceChangeListener(l1);
+        pref.removePreferenceChangeListener(l1);
+        try {
+            pref.removePreferenceChangeListener(l1);
+            fail();
+        } catch (IllegalArgumentException e) {
+        }
+
+    }
+
+    public void testSync() throws BackingStoreException {
+        pref.sync();
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        p.resetSyncTimes();
+        p.sync();
+        assertEquals(1, p.getSyncTimes());
+
+        p.resetSyncTimes();
+        MockAbstractPreferences child = (MockAbstractPreferences) p
+        .node("child");
+        MockAbstractPreferences child2 = new MockAbstractPreferences(p,
+        "child2");
+        p.childs.put("child2", child2);
+        assertEquals(1, p.cachedChildrenImpl().length);
+        assertSame(child, p.cachedChildrenImpl()[0]);
+        p.sync();
+        assertEquals(1, p.getSyncTimes());
+        assertEquals(1, child.getSyncTimes());
+        assertEquals(0, child2.getSyncTimes());
+
+        p.resetSyncTimes();
+        child.resetSyncTimes();
+        child.sync();
+        assertEquals(0, p.getSyncTimes());
+        assertEquals(1, child.getSyncTimes());
+
+        p.resetSyncTimes();
+        child.resetSyncTimes();
+        MockAbstractPreferences grandson = (MockAbstractPreferences) child
+        .node("grandson");
+        child.sync();
+        assertEquals(0, p.getSyncTimes());
+        assertEquals(1, child.getSyncTimes());
+        assertEquals(1, grandson.getSyncTimes());
+    }
+
+    public void testFlush() throws BackingStoreException {
+        pref.flush();
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        p.resetFlushedTimes();
+        p.flush();
+        assertEquals(1, p.getFlushedTimes());
+
+        p.resetFlushedTimes();
+        MockAbstractPreferences child = (MockAbstractPreferences) p
+        .node("child");
+        MockAbstractPreferences child2 = new MockAbstractPreferences(p,
+        "child2");
+        p.childs.put("child2", child2);
+        assertEquals(1, p.cachedChildrenImpl().length);
+        assertSame(child, p.cachedChildrenImpl()[0]);
+        p.flush();
+        assertEquals(1, p.getFlushedTimes());
+        assertEquals(1, child.getFlushedTimes());
+        assertEquals(0, child2.getFlushedTimes());
+
+        p.resetFlushedTimes();
+        child.resetFlushedTimes();
+        child.flush();
+        assertEquals(0, p.getFlushedTimes());
+        assertEquals(1, child.getFlushedTimes());
+
+        p.resetFlushedTimes();
+        child.resetFlushedTimes();
+        MockAbstractPreferences grandson = (MockAbstractPreferences) child
+        .node("grandson");
+        child.flush();
+        assertEquals(0, p.getFlushedTimes());
+        assertEquals(1, child.getFlushedTimes());
+        assertEquals(1, grandson.getFlushedTimes());
+
+        p.resetFlushedTimes();
+        child.resetFlushedTimes();
+        grandson.resetFlushedTimes();
+        child.removeNode();
+        child.flush();
+        assertEquals(0, p.getFlushedTimes());
+        assertEquals(1, child.getFlushedTimes());
+        assertEquals(0, grandson.getFlushedTimes());
+    }
+
+    public void testGetChild() throws BackingStoreException {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        assertNull(p.getChildImpl("child"));
+        MockAbstractPreferences child = new MockAbstractPreferences(p, "child");
+        p.childs.put("child", child);
+        assertSame(child, p.getChildImpl("child"));
+        assertNull(p.getChildImpl("child "));
+
+        assertNull(p.getChildImpl("child/grandson"));
+        child.childs.put("grandson", new MockAbstractPreferences(child,
+        "grandson"));
+        assertNull(p.getChildImpl("child/grandson"));
+
+        assertNull(p.getChildImpl(null));
+        assertNull(p.getChildImpl(""));
+        assertNull(p.getChildImpl(" "));
+        assertNull(p.getChildImpl("abc//abc"));
+        assertNull(p.getChildImpl("child/"));
+        assertNull(p.getChildImpl(longName + "a"));
+
+        child.removeNode();
+        assertNull(p.getChildImpl("child"));
+    }
+
+    public void testIsRemoved() throws BackingStoreException {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        assertFalse(p.isRemovedImpl());
+        p.removeNode();
+        assertTrue(p.isRemovedImpl());
+    }
+
+    public void testExportNode() throws Exception {
+        try {
+            pref.exportNode(null);
+            fail();
+        } catch (NullPointerException e) {
+            // Expected
+        }
+
+        pref.putBoolean("key", false);
+        Preferences child = pref.node("child<");
+        child.put("key2", "value2<");
+        Preferences grandson = child.node("grandson");
+        grandson.put("key3", "value3");
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        child.exportNode(out);
+
+        byte[] result = out.toByteArray();
+        ByteArrayInputStream in = new ByteArrayInputStream(result);
+
+        Document doc = parseXmlStream(in, true);
+
+        // only output this node without parent and children
+        String rootpath = "/preferences[@EXTERNAL_XML_VERSION='1.0']/root[@type='user']/node[@name='java']/node[@name='util']/node[@name='prefs']";
+        Node node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/map/entry[@key='key' and @value='false']");
+        assertNull(node);
+        node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/node[@name='child<']/map/entry[@key='key2' and @value='value2<']");
+        assertNotNull(node);
+        node = XPathAPI.selectSingleNode(doc, rootpath
+                + "/node[@name='mock']/node[@name='child']/node");
+        assertNull(node);
+    }
+
+    private static Document parseXmlStream(InputStream input, boolean validating)
+    throws SAXException, IOException, ParserConfigurationException {
+        // Create a builder factory
+        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+        factory.setValidating(validating);
+
+        // Create the builder and parse the file
+        DocumentBuilder builder = factory.newDocumentBuilder();
+        Document doc = builder.parse(input);
+        return doc;
+    }
+
+    public void testExportSubtree() throws Exception {
+        try {
+            pref.exportSubtree(null);
+            fail();
+        } catch (NullPointerException e) {
+            // Expected
+        }
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        pref.putBoolean("key", false);
+        Preferences child = pref.node("child");
+        child.put("key2", "value2");
+        Preferences grandson = child.node("grandson");
+        grandson.put("key3", "value3");
+        child.node("grandson2");
+        Preferences grandgrandson = grandson.node("grandgrandson");
+        grandgrandson.put("key4", "value4");
+        child.exportSubtree(out);
+
+        byte[] result = out.toByteArray();
+        // System.out.println(new String(result, "utf-8"));
+        ByteArrayInputStream in = new ByteArrayInputStream(result);
+        Document doc = parseXmlStream(in, true);
+
+        // only output this node and subtree without parent
+        String rootpath = "/preferences[@EXTERNAL_XML_VERSION='1.0']/root[@type='user']/node[@name='java']/node[@name='util']/node[@name='prefs']";
+        Node node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/map/entry[@key='key' and @value='false']");
+        assertNull(node);
+        node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/node[@name='child']/map/entry[@key='key2' and @value='value2']");
+        assertNotNull(node);
+        node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/node[@name='child']/node[@name='grandson']/map/entry[@key='key3' and @value='value3']");
+        assertNotNull(node);
+        node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/node[@name='child']/node[@name='grandson']/node[@name='grandgrandson']/map/entry[@key='key4' and @value='value4']");
+        assertNotNull(node);
+        node = XPathAPI
+        .selectSingleNode(
+                doc,
+                rootpath
+                + "/node[@name='mock']/node[@name='child']/node[@name='grandson2']/map");
+        assertNotNull(node);
+    }
+
+    public void testCachedChildren() throws Exception {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        assertEquals(0, p.cachedChildrenImpl().length);
+
+        MockAbstractPreferences child = (MockAbstractPreferences) p
+        .getChildImpl("child");
+        assertNull(child);
+
+        child = new MockAbstractPreferences(p, "child");
+        assertSame(child, p.getChildImpl("child"));
+
+        assertEquals(0, p.cachedChildrenImpl().length);
+
+        p.node("child");
+        assertSame(child, p.cachedChildrenImpl()[0]);
+
+        MockAbstractPreferences grandchild = new MockAbstractPreferences(child,
+        "grandchild");
+        assertSame(grandchild, child.getChildImpl("grandchild"));
+        assertNull(p.getChildImpl("grandchild"));
+
+        assertEquals(1, p.cachedChildrenImpl().length);
+        assertEquals(0, child.cachedChildrenImpl().length);
+
+        p.node("child/grandchild");
+        assertSame(child, p.cachedChildrenImpl()[0]);
+        assertSame(grandchild, child.cachedChildrenImpl()[0]);
+        assertEquals(1, p.cachedChildrenImpl().length);
+        assertEquals(1, child.cachedChildrenImpl().length);
+
+        p.childs.put("child2", new MockAbstractPreferences(p, "child2"));
+        p.nodeExists("child2/grandchild");
+        assertSame(child, p.cachedChildrenImpl()[0]);
+        assertSame(grandchild, child.cachedChildrenImpl()[0]);
+        assertEquals(1, p.cachedChildrenImpl().length);
+        assertEquals(1, child.cachedChildrenImpl().length);
+    }
+
+    public void testAbstractMethod() {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        ((MockAbstractPreferences) pref).protectedAbstractMethod();
+    }
+
+    public Object invokeNonPublicMethod(AbstractPreferences obj, String name,
+            Class<?>[] params, Object[] paramValues) throws SecurityException,
+            NoSuchMethodException, IllegalArgumentException,
+            IllegalAccessException, InvocationTargetException {
+        Method method = obj.getClass().getMethod(name, params);
+        method.setAccessible(true);
+        return method.invoke(obj, paramValues);
+    }
+
+    public void testBackingStoreException() throws IOException,
+    BackingStoreException {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        p.setResult(MockAbstractPreferences.backingException);
+        try {
+            p.childrenNames();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.put("exceptionkey", "value");
+        p.absolutePath();
+        p.toString();
+        assertEquals("exception default", p.get("key", "exception default"));
+        p.remove("key");
+        try {
+            p.clear();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.putInt("key", 3);
+        p.getInt("key", 3);
+        p.putLong("key", 3l);
+        p.getLong("key", 3l);
+        p.putDouble("key", 3);
+        p.getDouble("key", 3);
+        p.putBoolean("key", true);
+        p.getBoolean("key", true);
+        p.putFloat("key", 3f);
+        p.getFloat("key", 3f);
+        p.putByteArray("key", new byte[0]);
+        p.getByteArray("key", new byte[0]);
+        try {
+            p.keys();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+
+        try {
+            p.keys();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        try {
+            p.childrenNames();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.parent();
+        p.node("");
+        p.nodeExists("");
+        try {
+            p.removeNode();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.name();
+        p.absolutePath();
+        p.isUserNode();
+        MockPreferenceChangeListener mockPreferenceChangeListener = new MockPreferenceChangeListener();
+        p.addPreferenceChangeListener(mockPreferenceChangeListener);
+        p.removePreferenceChangeListener(mockPreferenceChangeListener);
+        MockNodeChangeListener mockNodeChangeListener = new MockNodeChangeListener();
+        p.addNodeChangeListener(mockNodeChangeListener);
+        p.removeNodeChangeListener(mockNodeChangeListener);
+        p.toString();
+        try {
+            p.sync();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        try {
+            p.flush();
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        try {
+            p.exportNode(new ByteArrayOutputStream());
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        try {
+            p.exportSubtree(new ByteArrayOutputStream());
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.isRemovedImpl();
+        try {
+            p.getChildImpl(null);
+            fail();
+        } catch (BackingStoreException e) {
+        }
+        p.cachedChildrenImpl();
+    }
+
+    public void testRuntimeException() throws IOException,
+    BackingStoreException {
+        if (!(pref instanceof MockAbstractPreferences)) {
+            return;
+        }
+        MockAbstractPreferences p = (MockAbstractPreferences) pref;
+        p.setResult(MockAbstractPreferences.runtimeException);
+        try {
+            p.childrenNames();
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        try {
+            p.put("exceptionkey", "value");
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        p.absolutePath();
+        p.toString();
+        assertEquals("exception default", p.get("key", "exception default"));
+        try {
+            p.remove("key");
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        try {
+            p.clear();
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        try {
+            p.putInt("key", 3);
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        p.getInt("key", 3);
+        try {
+            p.putLong("key", 3l);
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        p.getLong("key", 3l);
+        try {
+            p.putDouble("key", 3);
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        p.getDouble("key", 3);
+        try {
+            p.putBoolean("key", true);
+            fail();
+        } catch (MockRuntimeException e) {
+        }
+        p.getBoolean("key", true);
+        try {
+            p.putFloat("key", 3f);

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