PosInfoMoq2002.md

PosInfoMoq2002: Mock<T> class can be used only to mock non-sealed class

Property	Value
Rule ID	PosInfoMoq2002
Title	Mock<T> class can be used only to mock non-sealed class
Category	Compilation
Default severity	Error

Cause

The Mock<T> can mock only interfaces or non-sealed classes.

Rule description

The Mock<T> method must be use only on the interfaces or non-sealed classes.

For example, the following code can not mock the Service class because it is sealed.

[Fact]
public void Test()
{
	var service = new Mock<Service>();		// The Service can not be mocked, because it is a sealed class.
	service.Setup(s => s.GetData())
		.Returns(10);
}

public class Service
{
	public virtual int GetData() { }
}

How to fix violations

To fix a violation of this rule, be sure to mock interfaces or non-sealed classes.

When to suppress warnings

Do not suppress an error from this rule. If bypassed, the execution of the unit test will be failed with a MoqException thrown with the "Type to mock (xxx) must be an interface, a delegate, or a non-selead, non-static class" message.