By default, Sonar embarks two tools to calculate code coverage by unit tests on java projects : Cobertura and Clover. But last week, we also released plugins for two other coverage tools : Emma and JaCoCo. Both plugins are available in the Sonar Plugin Library. So I thought it would be a good time to compare all of them and share the results with the community.

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As Sonar is an enterprise quality tool, it must scale well when number of projects and snapshots by project grow over time. We consider this capability to be a plain Sonar functionality. So we manage it as the others by launching regression tests on each new release and trying to tune performance from one release to the other.

Ok fine, but what means “scale” in Sonar’s context and what is the protocol used to measure this capability ? As a good coach, we decided to answer this question by asking new ones :

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