如何使用Moq调用方法时验证上下文条件

Question

I'm using Moq and I need to check a condition when a mock method is called. Into following example i try to read the Property1 property, but this could be any expression:

var fooMock = new Mock<IFoo>();
fooMock.Setup(f => f.Method1())
       .Returns(null)
       .Check(f => f.Property1 == true) // Invented method
       .Verifiable();

My final objective is to check if a condition is true when the method is called. How can I perform this?

Answer 1

You could probably use Callback() , example:

// callbacks can be specified before and after invocation
mock.Setup(foo => foo.Execute("ping"))
    .Callback(() => Console.WriteLine("Before returns"))
    .Returns(true)
    .Callback(() => Console.WriteLine("After returns"));

In your case something like:

bool isProperty1True = false;
var fooMock = new Mock<IFoo>();
fooMock.Setup(f => f.Method1())
       .Callback(() => isProperty1True = fooMock.Object.Property1 == true) 
       .Returns(null)
       .Verifiable();

Assert.IsTrue(isProperty1True);