public void Flatten()
{
// Arrage
float Pitch = .1f;
float Yaw = .2f;
float Roll = .3f;
var rotator = new Rotator(Pitch, Yaw, Roll);
// Act
float[] result = rotator.Flatten().ToArray();
// Assert
CollectionAssert.AreEqual(result, new float[] { Pitch, Yaw, Roll });
}