MSTEST0057: Propagate source information in custom test method attributes

Cause

A custom TestMethodAttribute class does not propagate caller information to the base class constructor.

Rule description

When creating custom test method attributes that derive from TestMethodAttribute, you should propagate source information using caller information attributes. This allows MSTest to correctly track the source file and line number for test methods, improving diagnostics, test result reporting, and Test Explorer behavior.

public class MyTestMethodAttribute : TestMethodAttribute
{
    public MyTestMethodAttribute() // Violation
        : base()
    {
    }
}

How to fix violations

Add CallerFilePath and CallerLineNumber parameters to the constructor and pass them to the base class.

using System.Runtime.CompilerServices;

public class MyTestMethodAttribute : TestMethodAttribute
{
    public MyTestMethodAttribute(
        [CallerFilePath] string callerFilePath = "", 
        [CallerLineNumber] int callerLineNumber = -1)
        : base(callerFilePath, callerLineNumber)
    {
    }
}

When to suppress warnings

Do not suppress warnings from this rule. Propagating source information is essential for proper test reporting and diagnostics.

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 MSTEST0057
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0057

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

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0057.severity = none

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