Nov
19
3

Firing Events Made Easy

Author Eli Lopian    Category .NET Tests     Tags

I have already posted about Firing Events (There is a “Fire Event” party pic to the right). Here is how to use reflective mocks to Fire Events.

Here is the example again: 

public void Example()
{
   Button button = new Button();
   button.Click += new EventHandler(button_Click);
}

private void button_Click(object sender, EventArgs e)
{
   // Do Somethings here
}

Now we want to test that the Example class works correctly when the button is clicked. Here is how we mimic the Button click, by mocking the Button. 

Test]
public void TestThatExampleWorksWhenButtonClicked()
{
  Mock buttonMock = MockManager.Mock(typeof(Button));
  // expect Example to add an event (and keep a hook to the event)
  MockedEvent clickButton =buttonMock.ExpectAddEvent("Click");

  // invoke our test method that registers to button.Click
  Example();
  // Fire the event
  clickButton.Fire(this, EventArgs.Empty);
  // here we test that Example works correctly
  //…

  MockManager.Verify();
}

Notice the clickButton.Fire used to fire the Click event.

Cool :-)

Tip: The Event must be subscribed before using Fire. Guess why?

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