### Question:
AngleMath { public static double normalizeAngle(final double angle) { return angle - (Math.round((angle / (PI_TWO)) - 1e-6) * PI_TWO); } private  AngleMath(); static double normalizeAngle(final double angle); static double difference(final double angle1, final double angle2); static double cos(final double number); static double sin(final double number); static double tan(final double number); static double deg2rad(final double deg); static double rad2deg(final double rad); static double mirror(final double angle); static final double PI; static final double PI_TWO; static final double PI_HALF; static final double PI_QUART; static final double DEG_180_IN_RAD; static final double DEG_090_IN_RAD; static final double DEG_045_IN_RAD; }### Answer:
@Test public void testNormalizeAngle() { assertEquals(AngleMath.normalizeAngle(4.6f * AngleMath.PI), 0.6 * AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(-4.6f * AngleMath.PI), -0.6f * AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(3.6f * AngleMath.PI), -0.4f * AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(-3.6f * AngleMath.PI), 0.4 * AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(5.001f * AngleMath.PI), -0.999f * AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(5f * AngleMath.PI), AngleMath.PI, ACCURACY); assertEquals(AngleMath.normalizeAngle(4f * AngleMath.PI), 0, ACCURACY); }