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MSTEST0086: Remove redundant test method attribute

Property Value
Rule ID MSTEST0086
Title Remove redundant test method attribute
Category Usage
Fix is breaking or non-breaking Non-breaking
Enabled by default Yes
Default severity Info
Introduced in version 4.5.0 (preview)
Is there a code fix Yes, for C# only

Cause

A test method declares an MSTest attribute whose effective behavior is already supplied by its containing test class or a base test class.

Rule description

Duplicate attributes make the effective test policy harder to understand and maintain. The rule reports method-level conditions, retry settings, isolation settings, metadata, deployment items, or dependencies only when the class-level configuration already provides equivalent or more restrictive behavior.

The rule covers OSCondition, ArchitectureCondition, CICondition, DoNotParallelize, ResourceLock, Retry, Ignore, TestCategory, TestProperty, DeploymentItem, and DependsOn.

[TestClass, DoNotParallelize]
public class Tests
{
    [TestMethod, DoNotParallelize] // Violation
    public void Test() { }
}

How to fix violations

Remove the redundant method-level attribute. Keep an attribute on the method when it changes or narrows the class-level behavior.

[TestClass, DoNotParallelize]
public class Tests
{
    [TestMethod] public void Test() { }
}

A C# code fix removes the redundant attribute. Visual Basic reports the diagnostic but doesn't provide an automatic fix.

When to suppress warnings

Suppress the rule when the duplicate attribute intentionally documents a local policy and that documentation value outweighs the maintenance cost.

Suppress a warning

#pragma warning disable MSTEST0086
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0086

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

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0086.severity = none

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

See also

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