public void Vector2dAddsCorrectly()
{
var v = new Vector2d(2, 3);
Assert.False(v == v + 0);
Assert.False(v == v.Add(0));
Assert.True(v.Equivalent(v+0));
Assert.True(v.Equivalent(v.Add(0)));
Assert.True((v + v).Equivalent(new Vector2d(4, 6)));
Assert.True(v.Add(v).Equivalent(new Vector2d(4, 6)));
Assert.True((v + .1).Equivalent(new Vector2d(2.1, 3.1)));
Assert.True(v.Add(.1).Equivalent(new Vector2d(2.1, 3.1)));
}
