Frequently Asked Questions

General

1. Why should I use the emma-maven-plugin?
2. Why do my tests run twice?

General

Why should I use the emma-maven-plugin?

There are a number of maven plugins that measure code coverage:

• The emma-maven-plugin
• The cobertura-maven-plugin
• The maven-clover2-plugin

Each of these measure coverage in slightly different ways and have different licenses. Which tool you use depends on your requirements.

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Why do my tests run twice?

This is a common question. The short answer is "because it is good for you". More detailed reasons are:

• The first run ensures that all your tests work. The second run measures code coverage.
• Instrumentation of your code in order to measure code coverage can have side-effects which cause your tests to:
  • Pass when the uninstrumented tests fail
  • Fail when the uninstrumented tests pass
  These situations can happen more often than you think.

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