Do code coverage tools necessarily have to RUN Unit tests for analysis?

The usual open source tools, like Cobertura, Emma, etc., require running the tests. They use things like byte-code manipulation or AOP to instrument the code and track which lines get executed as the tests run, then produce reports of the results. The simplicity of it makes it a very attractive solution.

Standard test coverage tools, which collect information at run time, necessarily need something to exercise the code, and test suite at least has the purpose of covering all the functionality. If you don't have a test suite, you can run ad hoc tests but your coverage isn't likely to very good, and of course its a hard experiment to repeat.

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