Software

ReAssert: Suggesting Repairs for Broken Unit Tests

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Executive Summary

Developers often change software in ways that cause tests to fail. When this occurs, developers must determine whether failures are caused by errors in the code under test or in the test code itself. In the latter case, developers must repair failing tests or remove them from the test suite. Reparing tests is time consuming but beneficial, since removing tests reduces a test suite's ability to detect regressions. Fortunately, simple program transformations can repair many failing tests automatically. The authors present ReAssert, a novel technique and tool that suggests repairs to failing tests' code which cause the tests to pass. Examples include replacing literal values in tests, changing assertion methods, or replacing one assertion with several.

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