Moq1000.md

Moq1000: Sealed classes cannot be mocked

Item	Value
Enabled	True
Severity	Warning
CodeFix	False

---

Mocking requires generating a subclass of the class to be mocked. Sealed classes cannot be subclassed. To fix:

• Introduce an interface and mock that instead
• Use the real class and not a mock
• Unseal the class

Examples of patterns that are flagged by this analyzer

sealed class MyClass { }

var mock = new Mock<MyClass>(); // Moq1000: Sealed classes cannot be mocked

Solution

class MyClass { }

var mock = new Mock<MyClass>();

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 Moq1000
var mock = new Mock<MyClass>(); // Moq1000: Sealed classes cannot be mocked
#pragma warning restore Moq1000

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

[*.{cs,vb}]
dotnet_diagnostic.Moq1000.severity = none

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