MSTEST0013: AssemblyCleanup method should have valid layout

Property	Value
Rule ID	MSTEST0013
Title	AssemblyCleanup 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 [AssemblyCleanup] should have valid layout.

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

it should be public
it should be static
it should not be async void
it should not be a special method (finalizer, operator...).
it should not be generic
it should not be abstract
it should not take any parameter, or starting with MSTest 3.8, it can have a single TestContext 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 should be marked with [TestClass] (or a derived attribute)
the class should not be generic

Ensure that the method matches the layout described above.

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

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 MSTEST0013
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0013

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

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0013.severity = none