Working with unit tests in project or solution
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Unit testing assistance can be extended with other JetBrains .NET products: you can profile unit tests with dotTrace and analyze code coverage of unit tests with dotCover. These products are included in the dotUltimate license.
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ReSharper's unit test runner does not allow running two or more tests with the same ID. This rarely happens in practice, but if you do have tests with the same ID, they will appear as a single node in the Unit Tests explorer and Unit Test Sessions window, and only one of them will run.
Note that test frameworks identify tests in different ways. For example, MSTest uses test-methods FQNs but NUnit uses properties of test attributes as test IDs.