One of the most effective ways to ensure we have reliable automated testing is to write those tests as part of our daily work, using techniques such as test-driven development (TDD) and acceptance test-driven development (ATDD). This is when we begin every change to the system by first writing an automated test that validates the expected behavior fails and then we write the code to make the tests pass. This technique was developed by Kent Beck in the late 1990s as part of Extreme Programming, and has the following three steps: Ensure the tests fail. “Write a test for the next bit of
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