unit testing a class with event and delegate

Question

I am new to testing please help.

I have the following class

public delegate void OnInvalidEntryMethod(ITnEntry entry, string message);

public class          


        

Answer 1

It's probably simplest just to subscribe to the event using an anonymous method:

[Test]
public void IsValidEntry_WithValidValues()
{
    _selectedEntry = MakeEntry(_ticker);
    _entryValidator.OnInvalidEntry += delegate { 
        Assert.Fail("Shouldn't be called");
    };

    Assert.IsTrue(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
}    

[Test]
public void IsValidEntry_WithInValidTicker()
{
    bool eventRaised = false;
    _selectedEntry = MakeEntry("");
    _entryValidator.OnInvalidEntry += delegate { eventRaised = true; };

    Assert.IsFalse(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
    Assert.IsTrue(eventRaised);
}

In the second test you might want to validate that the event arguments were as expected too.

Also note that "invalid" is one word - so your test should be IsValidEntry_WithInvalidTicker. I'd also not bother with the setup - I'd just declare new local variables in each test.