Filters code coverage on New/Modified lines from a git diff

[apupier]

It would be nice to have the ability to filters code coverage on new and modified code for specific feature that would have been developed on a specific git branch. We can get the new/modified lines by doing a git diff.

The goal is to know what is code coverage of the introduced feature.

[marchof]

JaCoCo is a pure code coverage tool. If you want to combine code coverage with different figures you can use integrated tools like Sonar (which has "Code coverage on new code") or use the JaCoCo APIs to develop extensions on-top of it.

Due to limited resources I don't want to widen the scope of the JaCoCo project.

[apupier]

Ok I understand your position.
Can you provide a pointer to the right part of the Jacoco API to use to cover this use case?

[marchof]

With the JaCoCo analysis API you get code coverage information line by line e.g. for source files:

http://www.eclemma.org/jacoco/trunk/doc/api/org/jacoco/core/analysis/package-summary.html

This could then be matched with the modified lines. What we actually have on the road map (but probably not too soon) is a pluggable filtering API. This would allow to filter all lines which have not been touched by the change set. So you would get code coverage on modified code only.

[apupier]

Thanks for your comment.
I will see if we might help for Filtering API or use the forked version (for tracing see #15 and #141 )

Effectively, the work might be also done on Sonar side with some improvements: http://docs.codehaus.org/display/SONAR/Differential+Views#DifferentialViews-CodeCoverageonNew/ChangedCode