MSTEST0009: TestCleanup method should have valid layout

Property	Value
Rule ID	MSTEST0009
Title	TestCleanup method should have valid layout
Category	Usage
Fix is breaking or non-breaking	Non-breaking
Enabled by default	Yes
Default severity	Warning
Introduced in version	3.3.0
Is there a code fix	Yes

Cause

A method marked with [TestCleanup] should have valid layout.

Rule description

Methods marked with [TestCleanup] should follow the following layout to be valid:

• it should be public
• it should not be abstract
• it should not be async void
• it should not be static
• it should not be a special method (finalizer, operator...).
• it should not be generic
• it should not take any parameter
• return type should be void, Task or ValueTask

The type declaring these methods should also respect the following rules:

• The type should be a class.
• The class should be public or internal (if the test project is using the [DiscoverInternals] attribute).
• The class shouldn't be static.
• If the class is sealed, it should be marked with [TestClass] (or a derived attribute).

How to fix violations

Ensure that the method matches the layout described above.

When to suppress warnings

Do not suppress a warning from this rule. If you ignore this rule, flagged instances will be either skipped or result in runtime error.

Suppress a warning

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable MSTEST0009
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0009

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0009.severity = none

For more information, see How to suppress code analysis warnings.