struts-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From paulbrickell <paul.brick...@evolvedintelligence.com>
Subject RE: any struts 2 unit testers out there?
Date Fri, 04 Apr 2008 09:57:48 GMT

Actually thats an interesting post. To my mind it doesn't demonstrate a
solution. It demonstrates the problem.

Here is why I think this.

Struts 2 is just frankly brilliant for people doing test first development.
The classes you create really are POJOs. There are no dependencies on any
framework in my action classes. For example parameters are parsed well away
from my action and the values are set using simple properties, things like
sessions are simply maps. It is a truly new world for those of who have
suffered the horror of mocking http requests, responses, context and the
like.

But this simple scenario brings all that pain flooding back. I add a line in
my action like this...

String yadaYada = getText("some.doodad");

And my lovely world comes unraveled real quick. Now I need mock objects up
the ying-yang.

I started using the tutorial from the link posted (I am an Arsenal fan btw,
so got two for the price of one, thanks), but it still doesn't provide a
simple solution to the problem. To get this to work I have to build not just
the application context but a mass of supporting objects to get a web
application framework up and running before I can test my simple POJO.

I am not going to give up just yet, but I think I am still going to have to
look for another way.

Cheers,
Paul B.





Relph,Brian wrote:
> 
> 
> I recommend creating an action context.  Here is the basic guide I
> followed to do so:
> 
> http://arsenalist.com/2007/06/18/unit-testing-struts-2-actions-spring-junit/ 
> 
> If you are not using spring or the struts2 spring plugin, you can cut out
> all the code around the applicationContext.
> 
> 
> -----Original Message-----
> From: paulbrickell [mailto:paul.brickell@evolvedintelligence.com] 
> Sent: Thursday, April 03, 2008 11:44 AM
> To: user@struts.apache.org
> Subject: Re: any struts 2 unit testers out there?
> 
> 
> I am trying to deal with the same issue. Did you get any resolution?
> 
> Following on from the reply asking for a stack trace, here is what I am
> getting...
> 
> 
> java.lang.NullPointerException
> 	at
> com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:299)
> 	at
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:172)
> 	at
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:87)
> 	at com.opensymphony.xwork2.ActionSupport.getText(ActionSupport.java:80)
>         <SNIP>
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:585)
> 	at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
> 	at
> org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
> 	at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
> 	at
> org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
> 	at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
> 	at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
> 	at
> org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
> 	at
> org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
> 	at
> org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
> 	at
> org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
> 	at
> org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
> 	at
> org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
> 	at
> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
> 	at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> 	at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
> 	at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
> 	at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
> 	at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
> 
> 
> It is caused by ActionContext.getContext() returning null. Quite obviously
> I do not have an action context during my unit testing.
> 
> Now I can certainly use the ActionContext.setContext() in my tests setup
> method to push one into thread local storage and that works OK. It isn't
> ideal though because ActionContext is a concrete class and so my choices
> then become a bit limited. 
> 
> I could create an instance but when I try this I find I have to create a
> rather large object model to make it actually work. To the point where I
> despair and give up.
> 
> Alternatively I could use a mock library (like easy mock). But I am not
> inclined to include a mocking library that requires byte code rewriting
> (not even for testing).
> 
> What I really want to do is inject a text provider into the ActionSupport
> class. At the top of the ActionSupport class is this...
> 
> private final transient TextProvider textProvider = new
> TextProviderFactory().createInstance(getClass(), this);
> 
> Damn its final and so I cannot inject my own text provider. 
> 
> BUT it uses a factory, thats good. I know I will have a look at the
> factory I bet I can monkey with that and inject a mock. Nope. It's all
> instance based. No way I can get in there. And thats that. Now what do I
> do?
> 
> I can see two (half) workable solutions.
> 
> One is to override the the getText method in the action class when I
> instantiate it during testing. So I end up doing this in all my action
> unit tests...
> 
>         Action action = new MyAction()
>         {
>             @Override
>             public String getText(String textName)
>             {
>                 return "mocked";
>             }
>         };
> 
> It works, but its cheese.
> 
> Or two I can add a level of indirection in my action class, like so...
> 
> 
>     String text =
> MyTextProviderFactory.getInstance(class.name).getText("some.property");
> 
> Then I can use a delegate to the real text provider during live code and a
> mock of my own text provider during testing. The question here is, Why for
> the love of Pete, why?
> 
> So in conclusion there are at least four options for testing Action
> classes that use get text.
> 
> 1. Build an action context by hand. (Too hard) 2. Use a class rewriting
> mocking library. (Not on my watch) 3. Mock the get text method. (Cheese)
> 4. Add another level of indirection. (Man thats just annoying)
> 
> Comments?
> 
> BTW If you got this far, thanks for taking the time.
> Paul B.
> 
> 
> 
> 
> Session Mwamufiya wrote:
>> 
>> Hi All,
>> 
>> Would someone let me know whether it's possible to tweak something so 
>> that JUnit test code can run on an action method that calls the 
>> ActionSupport method getText() to fetch string resources from a
>> package.properties file.
>> As it stands, I keep getting a null exception when getText() is called 
>> during the unit test.
>> 
>> Thanks,
>> Session
>> 
>> 
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> For additional commands, e-mail: user-help@struts.apache.org
>> 
>> 
>> 
> 
> --
> View this message in context:
> http://www.nabble.com/any-struts-2-unit-testers-out-there--tp13437046p16467812.html
> Sent from the Struts - User mailing list archive at Nabble.com.
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
> 
> ----------------------------------------------------------------------
> CONFIDENTIALITY NOTICE This message and any included attachments are from
> Cerner Corporation and are intended only for the addressee. The
> information contained in this message is confidential and may constitute
> inside or non-public information under international, federal, or state
> securities laws. Unauthorized forwarding, printing, copying, distribution,
> or use of such information is strictly prohibited and may be unlawful. If
> you are not the addressee, please promptly delete this message and notify
> the sender of the delivery error by e-mail or you may call Cerner's
> corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024.
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
> 
> 
> 

-- 
View this message in context: http://www.nabble.com/any-struts-2-unit-testers-out-there--tp13437046p16488755.html
Sent from the Struts - User mailing list archive at Nabble.com.


---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org


Mime
View raw message