How Can I Be Sure The Test Is Right?

• Write the test

• Run it and make sure the new test fails

• Add the new feature / fix the bug

• Run the test and make sure the new test passes.

Some development systems, such as Aegis ( http://aegis.sf.net/ ), can enforce this process.

It's difficult to do this when writing tests for existing code

• Another reason to test as you go

• Formally called "Test-Driven Development"

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