message: tests: add tests for Angle::normalize
diff: @@ -19,6 +19,18 @@ extern crate cgmath;
  use cgmath::{Angle, Deg, Rad};
  +#[test]
  +fn test_normalize() {
  + let angle: Rad<f64> = Rad::full_turn().normalize();
  + assert_ulps_eq!(&angle, &Rad(0f64));
  +
  + let angle: Rad<f64> = (Rad::full_turn() + Rad::turn_div_4()).normalize();
  + assert_ulps_eq!(&angle, &Rad::turn_div_4());
  +
  + let angle: Rad<f64> = (-Rad::turn_div_4()).normalize();
  + assert_ulps_eq!(&angle, &(Rad::full_turn() - Rad::turn_div_4()));
  +}
  +
  #[test]
  fn test_normalize_signed() {
  let angle: Rad<f64> = Rad::full_turn().normalize_signed();
  