public void Equality_comparers_are_useful_when_using_certain_apis_such_as_linq()
{
var items = new[]
{
new ObjectWithoutEqualsOverride(1),
new ObjectWithoutEqualsOverride(1),
new ObjectWithoutEqualsOverride(2)
};
var comparer = new ObjectWithoutEqualsOverrideComparer();
var distinctItems = items.Distinct(comparer);
Assert.AreEqual(2, distinctItems.Count());
}
public void Equals_implementation_can_be_done_through_an_equality_comparer_instead_of_overriding_Equals()
{
var a = new ObjectWithoutEqualsOverride(1);
var b = new ObjectWithoutEqualsOverride(1);
var c = new ObjectWithoutEqualsOverride(2);
var comparer = new ObjectWithoutEqualsOverrideComparer();
Assert.IsTrue(comparer.Equals(a, a));
Assert.IsTrue(comparer.Equals(a, b));
Assert.IsFalse(comparer.Equals(a, c));
}
