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From "Michael Busch (JIRA)" <>
Subject [jira] Created: (LUCENE-721) Code coverage reports
Date Tue, 21 Nov 2006 07:01:02 GMT
Code coverage reports

                 Key: LUCENE-721
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Other
            Reporter: Michael Busch
            Priority: Minor
         Attachments: code_coverage.patch

Hi all,

We should be able to measure the code coverage of our unit testcases. I believe it would be
very helpful for the committers, if they could verify before committing a patch if it does
not reduce the coverage. 

Furthermore people could take a look in the code coverage reports to figure out where work
needs to be done, i. e. where additional testcases are neccessary. It would be nice if we
could add a page to the Lucene website showing the report, generated by the nightly build.
Maybe you could add that to your preview page (LUCENE-707), Grant?

I attach a patch here that uses the tool EMMA to generate the code coverage reports. EMMA
is a very nice open-source tool released under the CPL (same license as junit). The patch
adds three targets to common-build.xml: 
- emma-check: verifys if both emma.jar and emma_ant.jar are in the ant classpath 
- emma-instrument: instruments the compiled code 
- generate-emma-report: generates an html code coverage report 

The following steps are neccessary in order to generate a code coverage report:
- add emma.jar and emma_ant.jar to your ant classpath (download emma from
- execute ant target 'emma-instrument' (depends on compile-test, so it will compile all core
and test classes)
- execute ant target 'test' to run the unit tests
- execute ant target 'generate-emma-report'

To view the emma report open build/test/emma/index.html

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