Java test coverage: who covers what?

Question

Is there a tool similar to emma, that reports which test covers a specific implementation ?

Eakin

I would use a debugger to break point the line of code and run your tests to see which test is running then it hits that line of code. – Jeffiejeffrey

1.500.000 LOC, 50-70% aggregated test-coverage (itest+unittest). currently trying to increase / understand test-coverage of one module with 30.000 LOC. I need some good report, not individual manual tries ... – Eakin

Can you run groups of tests at a time and examine the report for that group? – Jeffiejeffrey

Answer 1

In case you want to see, which tests cover which line of code, you may use Clover that shows you:

• how many times one line got covered
• which tests covered line in question

To see what one can expect from Clover, here is a screenshot:

Survey

Answer 2

If you don't want to bother paying / setting up Cover, a much simpler way is:

• remove / disable all breakpoints
• put a breakpoint on the line that you which to know the tests covering it
• re-run the tests in debug mode
• look at the stacktrace to find the test calling it

This methods also allows you to see how many times a line is covered and all the tests calling it.

Theological