MSTEST0004: Public types should be test classes

Cause

A public type is not a test class (class marked with the [TestClass] attribute).

Rule description

It's considered a good practice to keep all helper and base classes internal and have only test classes marked public in a test project.

How to fix violations

Change the accessibility of the type to not be public.

When to suppress warnings

You can suppress instances of this diagnostic if the type should remain public for compatibility reason.

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 MSTEST0004
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0004

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

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0004.severity = none

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