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GNU Go Documentation

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21. Regression testing

The standard purpose of regression testing is to avoid getting the same bug twice. When a bug is found, the programmer fixes the bug and adds a test to the test suite. The test should fail before the fix and pass after the fix. When a new version is about to be released, all the tests in the regression test suite are run and if an old bug reappears, this will be seen quickly since the appropriate test will fail.

The regression testing in GNU Go is slightly different. A typical test case involves specifying a position and asking the engine what move it would make. This is compared to one or more correct moves to decide whether the test case passes or fails. It is also stored whether a test case is expected to pass or fail, and deviations in this status signify whether a change has solved some problem and/or broken something else. Thus the regression tests both include positions highlighting some mistake being done by the engine, which are waiting to be fixed, and positions where the engine does the right thing, where we want to detect if a change breaks something.

21.1 Regression testing in GNU Go  Regression Testing in GNU Go
21.2 Test suites  Test Suites
21.3 Performing tests  Performance Testing
21.4 HTML Regression Views  HTML Views


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