### Question:
AngleUtils { public static double minimumDifference(double a, double b) { double diffAngle = b - a; if (diffAngle > 180) diffAngle -= 360; else if (diffAngle < -180) diffAngle += 360; return diffAngle; }  static double minimumDifference(double a, double b); static double calculateTruncatedNextAngle(double angle, double currentAngle, double desiredAngle); static boolean between(float angle, float minAngle, float maxAngle);  }### Answer:
@Test public void test() { assertThat(AngleUtils.minimumDifference(0, 0), IsEqual.equalTo(0.0)); assertThat(AngleUtils.minimumDifference(0, 180), IsEqual.equalTo(180.0)); assertThat(AngleUtils.minimumDifference(0, 181), IsEqual.equalTo(-179.0)); assertThat(AngleUtils.minimumDifference(0, 359), IsEqual.equalTo(-1.0)); }