xUnit is the collection name for unit-testing compliant frameworks following a specific architecture. Implementation differs from language to language but the framework should consist of a Test Runner, Test Case, Test Fixture (Context), Test Suite, Test Execution, Test Result Formatter and Assertions

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Under the hood, the xUnit architecture is also far more extensible than the other Visual Studio test frameworks. You can create new attributes to control tests or extend the Assert class's Equal, NotEqual, Contains, DoesNotContain, InRange and NotInRange methods to provide custom functionality.