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Published in:
2010 | OriginalPaper | Chapter
Parameterized Unit Testing with Pex: Tutorial
Authors : Nikolai Tillmann, Jonathan de Halleux, Wolfram Schulte
Published in: Testing Techniques in Software Engineering
Publisher: Springer Berlin Heidelberg
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This hands-on tutorial teaches the principles of Parameterized Unit Testing in Visual Studio with Pex, an automatic test input generator.
A parameterized unit test (PUT) is simply a method that takes parameters, calls the code under test, and states assertions. Given a PUT written in a .NET language, Pex automatically produces a small test suite with high code and assertion coverage.Moreover, when a generated test fails, Pex can often suggest a bug fix. To do so, Pex performs a systematic program analysis, similar to path bounded model-checking. Pex learns the program behavior by monitoring execution traces, and uses a constraint solver to produce new test cases with different behavior. At Microsoft, this technique proved highly effective in testing even an extremely well-tested component.