Worse, suppose the problem wasn’t caused by a code change, but was due to a test environment issue (e.g., an incorrect configuration setting somewhere). The development team may believe that they fixed the problem because all the unit tests pass, only to discover that the tests will still fail later that night. Further complicating the issue, ten more changes will have been checked in to version control by the team that day. Each of these changes has the potential to introduce more errors that could break our automated tests, further increasing the difficulty of successfully diagnosing and
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