public void GetHashCode_InvokedOverKey()
{
IEqualityComparer <string> subject = new SelectorEqualizer <string, string>(s => s.ToLower());
Assert.That(subject.GetHashCode("DANIEL"), Is.EqualTo("daniel".GetHashCode()));
Assert.That(subject.GetHashCode("DANIEL"), Is.Not.EqualTo("someoneElse".GetHashCode()));
}
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 Explore()
{
IEqualityComparer <EqualitySubject> subject = new SelectorEqualizer <EqualitySubject, int>(s => s.I);
Assert.That(subject.Equals(new EqualitySubject {
I = 1
}, new EqualitySubject {
I = 2
}), Is.False);
Assert.That(subject.GetHashCode(new EqualitySubject {
I = 1
}), Is.EqualTo(1.GetHashCode()));
IEqualityComparer <EqualitySubject> byDAndI = new SelectorEqualizer <EqualitySubject, decimal>(s => s.D)
.Then(s => s.I);
byDAndI = Eq <EqualitySubject> .By(s => s.D)
.Then(s => s.I);
}
public void GetHashCode_NullKey_Zero()
{
IEqualityComparer <string> subject = new SelectorEqualizer <string, string>(s => null);
Assert.That(subject.GetHashCode("whatever"), Is.EqualTo(0));
}