How test Event?

Hi yus,

Instead of faking the event you can fake the callback method.

public class SomeClass

    {
        public EventHandler SomeEvent;
    }
 
    public class MyClass
    {
        private SomeClass _myObject = new SomeClass();
 
        public MyClass()
        {
            _myObject.SomeEvent += mySomeEvent;
        }
 
        //this simulates the fire event for the example
        public void SomethingThatInvokesTheEvent()
        {
            _myObject.SomeEvent(null,null);
        }
 
        private void mySomeEvent(object m, EventArgs e)
        {
            System.Diagnostics.Trace.WriteLine("Main tick message");
        }
 
    }

This is the test method:

We added wasCalled field in order for the assert 

[TestMethod, Isolated]
        public void TestMethod1()
        {
            bool wasCalled = false;
 
            var myClass = new MyClass();
            Isolate.NonPublic.WhenCalled(myClass, "mySomeEvent", null, null).DoInstead(c => wasC            alled = true);
 
            myClass.SomethingThatInvokesTheEvent();
 
            Assert.IsTrue(wasCalled);
        }

Note!

We added a method that fires the event(SomethingThatInvokesTheEvent()),

So you can fire the event from the test after you fake the event.