public void TestComparerWithValueComparer()
{
Assert.Throws <ArgumentNullException>(() => Maybe.Comparer <int>(null));
var valueComparer = Comparer <TestRef> .Create((x, y) => x.Value.CompareTo(y.Value));
var comparer = Maybe.Comparer(valueComparer);
{
var x = Maybe <TestRef> .Nothing;
var y = Maybe <TestRef> .Nothing;
var result = comparer.Compare(x, y);
Assert.AreEqual(0, result);
}
{
var x = Maybe <TestRef> .Nothing;
var y = Maybe.Just(new TestRef(1));
var result = comparer.Compare(x, y);
Assert.AreEqual(-1, result);
}
{
var x = Maybe <TestRef> .Just(new TestRef(1));
var y = Maybe <TestRef> .Nothing;
var result = comparer.Compare(x, y);
Assert.AreEqual(1, result);
}
{
var x = Maybe <TestRef> .Just(new TestRef(1));
var y = Maybe <TestRef> .Just(new TestRef(1));
var result = comparer.Compare(x, y);
Assert.AreEqual(0, result);
}
{
var x = Maybe <TestRef> .Just(new TestRef(2));
var y = Maybe <TestRef> .Just(new TestRef(1));
var result = comparer.Compare(x, y);
Assert.AreEqual(1, result);
}
{
var x = Maybe <TestRef> .Just(new TestRef(1));
var y = Maybe <TestRef> .Just(new TestRef(2));
var result = comparer.Compare(x, y);
Assert.AreEqual(-1, result);
}
}
public void TestComparerValueComparable()
{
var comparer = Maybe.Comparer <int>();
{
var x = Maybe <int> .Nothing;
var y = Maybe <int> .Nothing;
var result = comparer.Compare(x, y);
Assert.AreEqual(0, result);
}
{
var x = Maybe <int> .Nothing;
var y = Maybe.Just(1);
var result = comparer.Compare(x, y);
Assert.AreEqual(-1, result);
}
{
var x = Maybe <int> .Just(1);
var y = Maybe <int> .Nothing;
var result = comparer.Compare(x, y);
Assert.AreEqual(1, result);
}
{
var x = Maybe <int> .Just(1);
var y = Maybe <int> .Just(1);
var result = comparer.Compare(x, y);
Assert.AreEqual(0, result);
}
{
var x = Maybe <int> .Just(2);
var y = Maybe <int> .Just(1);
var result = comparer.Compare(x, y);
Assert.AreEqual(1, result);
}
{
var x = Maybe <int> .Just(1);
var y = Maybe <int> .Just(2);
var result = comparer.Compare(x, y);
Assert.AreEqual(-1, result);
}
}
