Maintain code quality of unit tests

One of the most powerful ReSharper features — code inspection — comes in handy when you write unit tests. In addition to hundreds of general-purpose inspections, there is also a number of dedicated inspections that target problems specific to unit tests:

NUnit (30 inspections)

These inspections detect code issues related to NUnit tests.

Inspection	Default severity
NUnit. Async test method must return Task or Task<T>	Warning
NUnit. Duplicate values.	Warning
NUnit. Ignored parameter attribute.	Warning
NUnit. Implicitly unspecified null values.	Warning
NUnit. Incompatible argument type or incorrect argument value.	Warning
NUnit. Incompatible expected result type or incorrect value.	Warning
NUnit. Incorrect range bounds. 'to' must be greater than or equal to 'from'.	Warning
NUnit. Mismatch of the range step sign.	Warning
NUnit. Missing arguments in TestCase attribute.	Warning
NUnit. Missing 'CancelAfter' attribute on test method declaration.	Warning
NUnit. Missing expected result for non-void test method.	Warning
NUnit. No values provided in the attributes.	Warning
NUnit. Non-public test method.	Warning
NUnit. Range 'step' parameter value must be non-zero.	Warning
NUnit. Redundant argument in TestCase attribute.	Warning
NUnit. Redundant argument instead of ExpectedResult.	Warning
NUnit. Redundant expected result for void test method.	Warning
NUnit. Specified attribute values produce too many tests.	Disabled
NUnit. Specified values are not compatible with the test parameter type.	Warning
NUnit. Test case Result property duplicates ExpectedResult.	Warning
NUnit. Test case Result property is obsolete.	Warning
NUnit. Test case source must be field, property, or method.	Warning
NUnit. Test case source must be non-abstract and implement IEnumerable.	Warning
NUnit. Test case source must be static.	Warning
NUnit. The maximum range value is not reachable with the step value.	Warning
NUnit. Values for test method parameters are not provided.	Warning
NUnit. Values in range do not fit the type of the test parameter.	Warning
NUnit.AutoFixture. Incompatible argument type or incorrect argument value.	Warning
NUnit.AutoFixture. Missing Test or TestFixture attribute.	Warning
NUnit.AutoFixture. Redundant argument in InlineAutoData attribute.	Warning

Xunit (1 inspection)

These inspections detect code issues related to xUnit.Net tests.

Inspection	Default severity
Console output in Xunit tests	Warning

20 November 2025