Code Inspection: NUnit. Cannot resolve symbol in [TestCaseSource] argument

NUnit's TestCaseSource and ValueSource attributes are used to identify the source from which the argument(s) will be provided for a parameterized test. If the class, field, property, or method specified as the test source is not found in the current context, JetBrains Rider issues a warning.

Note that NUnit allows different ways of specifying test case sources. For more information, refer to the TestCaseSourceAttribute and ValueSourceAttribute documentation.