How to fail NUnit test by default (I want to call Assert.Pass when it should pass)

Question

I have medium level experience on unit testing and now I'm learning about NUnit.

As far as I can see, a NUnit test passes by default if you don't call Assert.Fail method.

In my test case, I want it to fail by default unless I call Assert.Pass method.

How can I do that if it's possible?

Simplified Example

Current behavior:

// This test passes
public void Test1()
{
}

// This test fails
public void Test1()
{
    Assert.Fail();
}

The behavior I want:

// This test must fail
public void Test1()
{
}

// This test must pass
public void Test1()
{
    Assert.Pass();
}

Detailed Example for curious cats

The last line of this test looks unnecessary to me. I would like to remove Assert.Fail() call at the end if it was possible to mark the test as "fail by default" somehow. Maybe a parameter for [Test] attribute???

[Test]
public void SetValue_RaisesChangedEvent()
{
    var Property = new Property();
    Property.Changed += (Sender, Args) => Assert.Pass();

    Property.SetValue(1);
    Assert.Fail();
}

Answer 1

Editing my original answer as I incorrectly stated that test would continue after Assert.Pass() call.

http://nunit.org/docs/2.5/utilityAsserts.html

Your specific example could be re-written like this as well to avoid the strange Assert.Fail() call at end.

[Test]
public void SetValue_RaisesChangedEvent()
{
    var eventFired = false;
    var Property = new Property();
    Property.Changed += (Sender, Args) => eventFired = true;

    Property.SetValue(1);
    Assert.IsTrue(eventFired);
}

One could say, by default this test will fail, unless the Property.Changed event fires.