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NUnit is a unit-testing framework for all .NET languages, providing attributes, assertions, test runners and extensibility for automated testing. It supports parameterized tests, fixtures, and rich assertions to validate behavior during development and CI pipelines. Widely used in .NET ecosystems for maintaining test suites and regression prevention.
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NUnit is an open-source .NET testing framework that discovers tests through attributes, runs them, and reports results.
NUnit began in 2000 as a port of the Java JUnit framework to .NET and then evolved as an independent C# project. Its community added parameterized tests, constraints, and parallel execution.
Test fixtures group methods, while attributes mark setup and tests. Assertions express expectations with constraints; the runner discovers tests, executes them in isolation or in parallel, and reports to IDEs and CI.
A fixture groups tests and shared setup or teardown logic.
Constraints express readable conditions against which a result is checked.
One test definition is reused with multiple specified inputs.
NUnit makes .NET tests automatable and visible in CI. Useful results require deterministic tests, clear boundaries, controlled dependencies, and a sensible separation of unit and integration tests.
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