public void QuaternionLengthTest() { Vector3 v = new Vector3(1.0f, 2.0f, 3.0f); Single w = 4.0f; Quaternion target = new Quaternion(v, w); Single expected = 5.477226f; Single actual; actual = target.Length(); Assert.True(MathHelper.Equal(expected, actual), $"Quaternion.Length did not return the expected value: expected {expected} actual {actual}"); }