Attributes

NUnit uses custom attributes to identify tests. All NUnit attributes are contained in the NUnit.Framework namespace. Each source file that contains tests must include a using statement for that namespace and the project must reference the framework assembly, nunit.framework.dll.

This table lists all the attributes supported by NUnit.

Attribute	Usage
Apartment Attribute	Indicates that the test should run in a particular apartment.
Author Attribute	Provides the name of the test author.
CancelAfter Attribute	Provides a timeout value in milliseconds for test cases.
Category Attribute	Specifies one or more categories for the test.
Combinatorial Attribute	Generates test cases for all possible combinations of the values provided.
Culture Attribute	Specifies cultures for which a test or fixture should be run.
Datapoint Attribute	Provides data for Theories.
DatapointSource Attribute	Provides data for Theories.
DefaultFloatingPointTolerance Attribute	Indicates that the test should use the specified tolerance as default for float and double comparisons.
Description Attribute	Applies descriptive text to a Test, TestFixture or Assembly.
Explicit Attribute	Indicates that a test should be skipped unless explicitly run.
FixtureLifeCycle Attribute	Specifies the lifecycle of a fixture allowing a new instance of a test fixture to be constructed for each test case. Useful in situations where test case parallelism is important.
Ignore Attribute	Indicates that a test shouldn't be run for some reason.
LevelOfParallelism Attribute	Specifies the level of parallelism at assembly level.
MaxTime Attribute	Specifies the maximum time in milliseconds for a test case to succeed.
NonParallelizable Attribute	Specifies that the test and its descendants may not be run in parallel.
NonTestAssembly Attribute	Specifies that the assembly references the NUnit framework, but that it does not contain tests.
OneTimeSetUp Attribute	Identifies methods to be called once prior to any child tests.
OneTimeTearDown Attribute	Identifies methods to be called once after all child tests.
Order Attribute	Specifies the order in which decorated test should be run within the containing fixture or suite.
Pairwise Attribute	Generate test cases for all possible pairs of the values provided.
Parallelizable Attribute	Indicates whether test and/or its descendants can be run in parallel.
Platform Attribute	Specifies platforms for which a test or fixture should be run.
Property Attribute	Allows setting named properties on any test case or fixture.
Random Attribute	Specifies generation of random values as arguments to a parameterized test.
Range Attribute	Specifies a range of values as arguments to a parameterized test.
Repeat Attribute	Specifies that the decorated method should be executed multiple times.
RequiresThread Attribute	Indicates that a test method, class or assembly should be run on a separate thread.
Retry Attribute	Causes a test to be rerun if it fails, up to a maximum number of times.
Sequential Attribute	Generates test cases using values in the order provided, without additional combinations.
SetCulture Attribute	Sets the current Culture for the duration of a test.
SetUICulture Attribute	Sets the current UI Culture for the duration of a test.
SetUp Attribute	Indicates a method of a TestFixture called just before each test method.
SetUpFixture Attribute	Marks a class with one-time setup or teardown methods for all the test fixtures in a namespace.
SingleThreaded Attribute	Marks a fixture that requires all its tests to run on the same thread.
TearDown Attribute	Indicates a method of a TestFixture called just after each test method.
Test Attribute	Marks a method of a TestFixture that represents a test.
TestCase Attribute	Marks a method with parameters as a test and provides inline arguments.
TestCaseSource Attribute	Marks a method with parameters as a test and provides a source of arguments.
TestFixture Attribute	Marks a class as a test fixture and may provide inline constructor arguments.
TestFixtureSetup Attribute	Deprecated synonym for OneTimeSetUp Attribute.
TestFixtureSource Attribute	Marks a class as a test fixture and provides a source for constructor arguments.
TestFixtureTeardown Attribute	Deprecated synonym for OneTimeTearDown Attribute.
TestOf Attribute	Indicates the name or Type of the class being tested.
Theory Attribute	Marks a test method as a Theory, a special kind of test in NUnit.
Timeout Attribute	Provides a timeout value in milliseconds for test cases.
Values Attribute	Provides a set of inline values for a parameter of a test method.
ValueSource Attribute	Provides a source of values for a parameter of a test method.