void TestNegation (Matrix44 a, Matrix44 expected )
{
// This test asserts the following:
// -a == expected
var result_1a = -a;
Matrix44 result_1b;
Matrix44.Negate(ref a, out result_1b);
Assert.That(result_1a, Is.EqualTo(expected));
Assert.That(result_1b, Is.EqualTo(expected));
}