public void DefaultComparerReturnsFalseIfObjectsAreNotSame()
{
var comparer = ObjectReferenceComparer <ObjRefComparerTestStub> .Default;
var x = new ObjRefComparerTestStub(1);
var y = new ObjRefComparerTestStub(2);
bool result = comparer.Equals(x, y);
Assert.IsFalse(result);
}
public void DefaultComparerReturnsTrueIfOjectsAreSameInstance()
{
var comparer = ObjectReferenceComparer <ObjRefComparerTestStub> .Default;
var x = new ObjRefComparerTestStub(1);
var y = x;
bool result = comparer.Equals(x, y);
Assert.IsTrue(result);
}
public void ComparerReturnsFalseIfObjectsAreNotSameInstanceIgnoringEquatableImplementation()
{
var comparer = new ObjectReferenceComparer <ObjRefComparerTestStub>();
var x = new ObjRefComparerTestStub(1);
var y = new ObjRefComparerTestStub(1);
bool comparerResult = comparer.Equals(x, y);
bool equalsResult = x.Equals(y);
Assert.IsFalse(comparerResult);
Assert.IsTrue(equalsResult);
}
public void DefaultComparerReturnsFalseIfObjectsAreNotSameInstanceIgnoringEqualsOverride()
{
var comparer = ObjectReferenceComparer <ObjRefComparerTestStub> .Default;
var x = new ObjRefComparerTestStub(1);
var y = new ObjRefComparerTestStub(1);
bool comparerResult = comparer.Equals(x, y);
bool equalsResult = x.Equals((object)y);
Assert.IsFalse(comparerResult);
Assert.IsTrue(equalsResult);
}
public void ObjectReferenceComparerGetHashCodeReturnsSameHashCodeForObject()
{
var comparer = ObjectReferenceComparer <IEquatable <ObjRefComparerTestStub> > .Default;
IEquatable <ObjRefComparerTestStub> obj = new ObjRefComparerTestStub(2);
//get the HashCode 2000 times to confirm it is consistent for lifetime of the object
HashSet <int> hashes = new HashSet <int>();
for (int i = 0; i < 2000; i++)
{
hashes.Add(comparer.GetHashCode(obj));
}
Assert.AreEqual(1, hashes.Count);
}