Is is possible to mock a private method of a Static class?

[David]

I tried the following:

Mock.NonPublic.Arrange(StaticClass, "PrivatedMethod", Arg.IsAny<object>()).CallOriginal();

But as the Static class cannot be instantiated, I have to pass the class, never a variable and Arrange Syntax is not happy about it at all.

Is this intentional? I mean, Justmock does not tolerate mocking private method of static classes at all?

I've found two workarounds:
- Make the method public for temporary testing purposes.
- Make the static class singleton for temporary testing purposes.

This two workarounds are just fine for temporary testing but I cannot modify the class structure.

Any suggestion is welcomed.

[Kaloyan]

Hi David,

Mocking a private static method/function is completely achievable with JustMock. For more details and some examples, please check this article for our online help documentation.

Further, I have prepared a simple demo for you:

Let's assume we have the following static class

public static class StaticClass
{
    public static void CallPrivate(object obj)
    {
        PrivateMethod(obj);
    }
    private static void PrivateMethod(object obj)
    {

    }
}

Now, we want to check if the PrivateMethod is being called from the CallPrivate method. To do this, I prepared the following test

[TestMethod]

public void ShouldArrangeForPrivateStaticMethod()

{

    Mock.NonPublic.Arrange(typeof(StaticClass), "PrivateMethod", ArgExpr.IsAny<object>())

        .CallOriginal().MustBeCalled();

 

    StaticClass.CallPrivate(1);

 
             edit:

    Mock.NonPublic.Assert(typeof(StaticClass), "PrivateMethod", ArgExpr.IsAny<object>());

}

I hope this helps.

Regards,
Kaloyan
Telerik

[David]

It worked, thank you for the quick answer!