In short, how do I know if I am writing good tests for my code?
When you don't have any bugs in your code, you know that you are writing good tests.
you might consider rcov - provides C0 test coverage analysis.
"Code coverage shouldn't be abused (in few words, C0 coverage guarantees nothing) but it's still useful for testing: it will at least tell you when your tests need more work, and most importantly where." [1]
[1]http://eigenclass.org/hiki.rb?rcov
J
