public void GetHashCode_NullKey_GetHashCodeInvocationNotNeeded()
{
var spy = new EqualitySpy();
IEqualityComparer <EqualitySpy> subject = new SelectorEqualizer <EqualitySpy, string>(s => s.FakeASelector <string>(null));
subject.GetHashCode(spy);
Assert.That(spy.GetHashCodeCalled, Is.False);
}
public void Equals_NoKeyIsNull_EqualsInvoked()
{
EqualitySpy spyForX = new EqualitySpy(), spyForY = new EqualitySpy();
Func <string, EqualitySpy> eachSpyToEachLetter = s => s.Equals("x") ? spyForX : spyForY;
IEqualityComparer <string> subject = new SelectorEqualizer <string, EqualitySpy>(eachSpyToEachLetter);
subject.Equals("x", "y");
Assert.That(spyForX.EqualsCalled, Is.True);
Assert.That(spyForY.EqualsCalled, Is.True);
}
public void Equals_OneKeyNull_SelectedEqualsNotCalled()
{
EqualitySpy spyForX = new EqualitySpy(), spyForY = new EqualitySpy();
Func <string, EqualitySpy> spyXForX = s => s.Equals("x") ? spyForX : null;
Func <string, EqualitySpy> spyYForY = s => s.Equals("y") ? spyForY : null;
IEqualityComparer <string> subject = new SelectorEqualizer <string, EqualitySpy>(spyXForX);
subject.Equals("x", "y");
Assert.That(spyForX.EqualsCalled, Is.False);
subject = new SelectorEqualizer <string, EqualitySpy>(spyYForY);
subject.Equals("x", "y");
Assert.That(spyForY.EqualsCalled, Is.False);
}