SetUp And TearDown

Attribute Usage

SetUpAttribute is now used exclusively for per-test setup.
TearDownAttribute is now used exclusively for per-test teardown.
OneTimeSetUpAttribute is used for one-time setup per test-run. If you run n tests, this event will only occur once.
OneTimeTearDownAttribute is used for one-time teardown per test-run. If you run n tests, this event will only occur once
SetUpFixtureAttribute continues to be used as at before, but with changed method attributes.

Attribute Usage by Fixture Type

	TestFixture	SetUpFixture
OneTimeSetUp	Supported	Supported
OneTimeTearDown	Supported	Supported
TestFixtureSetUp	Deprecated	Not Allowed
TestFixtureTearDown	Deprecated	Not Allowed
SetUp	Supported	Not Allowed
TearDown	Supported	Not Allowed

How Setup and TearDown Methods Are Called

Multiple SetUp, OneTimeSetUp, TearDown and OneTimeTearDown methods may exist within a class.

Setup methods (both types) are called on base classes first, then on derived classes. If any setup method throws an exception, no further setups are called.

Teardown methods (again, both types) are called on derived classes first, then on the base class. The teardown methods at any level in the inheritance hierarchy will be called only if a setup method at the same level was called. The following example is illustrates the difference.

public class BaseClass
{
   [SetUp]
   public void BaseSetUp() { /* ... */ } // Exception thrown!

   [TearDown]
   public void BaseTearDown() { /* ... */ }
}

[TestFixture]
public class DerivedClass : BaseClass
{
   [SetUp]
   public void DerivedSetUp() { /* ... */ }

   [TearDown]
   public void DerivedTearDown() { /* ... */ }

   [Test]
   public void TestMethod() { /* ... */ }
}

Execution will proceed as follows:

BaseSetUp
BaseTearDown

rather than

BaseSetUp
DerivedTearDown
BaseTearDown