Do you know the difference between branch and path coverage? If you get 100% branch coverage, but only assert one aspect of your code, would you consider your unit test(s) complete?
Now you can easily see both path and branch coverage on any JUnit test. It doesn't matter if you created test, if we created the test, or even if another product created the test.
As a matter of fact, go ahead and use another product to create your JUnit tests, but use us to measure your path coverage.