I would just like to say that redundant tests have some negative qualities:

• The test suite will run slower, and with 2,500 tests, that is going to become an issue.
• Time spent developing unnecessary tests detracts from development of new code.

I have some common sense guidelines for test writing:

• Test the boundary cases far more than the regular cases.
• Focus tests on buggy or expected-to-be-buggy code.
• If you can write the test cases first, then good for you, but be aware that the test suite is broken until the code is completed.
• Interesting things happen when Person A writes tests for Person B's code.
• If you have performance requirements, write tests that only pass if those requirements are met.
• Coverage is important.

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