NUnit

To list NUnit tests from your solution in the Unit Test Explorer window, ReSharper needs to discover unit tests.

The discovery of tests in specific project happens only after the project is built. You can choose between two options that allow you to prefer either speed or accuracy for discovering unit tests after the build.

• Metadata (default)

  In this mode, ReSharper analyzes the build artifact without launching the test runner.

  As tests are defined using attributes, ReSharper can quickly scan the metadata of managed artifacts to find most tests in the project. However, it may fail to find tests that require running some special hooks of NUnit to define their parameters.

  This is the fastest way of discovering tests.

• Test runner

  In this mode, ReSharper launches NUnit runner in the discovery mode on the build artifact, and then uses the results from the runner.

  Using NUnit runner can take considerably longer to analyze the project, but the list of discovered tests will be complete in most cases.

After you run all tests from a specific project, ReSharper will update the list of tests in this project independently of the selected discovery mode because letting the NUnit runner to execute all tests is the most accurate way of test discovery.