I need to verify that a method has been invoked 2 times with specific arguments:
public void Execute()
{
Counter с = new Counter(1);
// Basically, I need to verify that DoSomething method was called twice:
// First time with an argument, which internal value is 1...
_subject.DoSomething(с);
c.Increment();
// ... and the second time - with internal value of 2
_subject.DoSomething(c);
}
Here is my verification part, with both assertions failing:
// Fails with message "Expected invocation on the mock once, but was 0 times"
mock.Verify(
m => m.DoSomething(
It.Is<Counter>(
x => x.GetValue() == 1
)
),
Times.Once
);
// Fails with message "Expected invocation on the mock once, but was 2 times"
mock.Verify(
m => m.DoSomething(
It.Is<Counter>(
x => x.GetValue() == 2
)
),
Times.Once
);
So the problem is that both invocations inside the Execute method use the same argument, which by the time of performing the assertion contains 2 as its internal value.
The question is how to make the mock to "record" the arguments somehow, so that they are evaluated correctly?
Below is the full listing:
[Test]
public void CheckSomething()
{
Mock<Subject> mock = new Mock<ISubject>();
mock.Setup(m => m.DoSomething(It.IsAny<Counter>()));
var myService = new MyService(mock.Object);
myService.Execute();
mock.Verify(m => m.DoSomething(It.Is<Counter>(x => x.GetValue() == 2)), Times.Once);
mock.Verify(m => m.DoSomething(It.Is<Counter>(x => x.GetValue() == 1)), Times.Once);
}
public interface ISubject
{
public void DoSomething(Counter с);
}
public class Subject : ISubject
{
public void DoSomething(Counter с)
{
// doesn't matter
}
}
public class MyService
{
private readonly ISubject _subject;
public MyService(ISubject subject)
{
_subject = subject;
}
public void Execute()
{
Counter с = new Counter(1);
_subject.DoSomething(с);
с.Increment();
_subject.DoSomething(с);
}
}
public class Counter
{
private int _val;
public Counter(int val)
{
_val = val;
}
public void Increment()
{
_val++;
}
public int GetValue()
{
return _val;
}
}
I really appreciate any feedback, thanks!