Does Clover work on the Source code or the bytecode?

Clover works on the source code. It is not possible for Clover to work on bytecodes.

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Why are my tests executed twice?

The Clover plugin takes great care not to mix the instrumented code nor any artifact generated from it with main production sources and artifacts. This is the reason why you may see your tests executed twice: once for the production sources and once for the Clover-instrumented sources.

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