public void Test_Apply()
{
var q1 = new Quaternion (90, 0, 0, 1);
var q2 = new Quaternion (90, 0, 1, 0);
var q3 = new Quaternion (90, 1, 0, 0);
var v1 = q1.Apply (new Vector3 (1, 0, 0));
var v2 = q2.Apply (new Vector3 (0, 1, 0));
var v3 = q3.Apply (new Vector3 (0, 0, 1));
Assert.AreEqual (new Vector3 (0, 1, 0), v1);
Assert.AreEqual (new Vector3 (0, 1, 0), v2);
Assert.AreEqual (new Vector3 (0, -1, 0), v3);
}