@Test
public void testFind_upper_left() {

    double x1 = 25.0;
    double y1 = 45.0;
    double x2 = -25.0;
    double y2 = 100.0;
    double expResult = Math.toRadians(312.273689);
    double result = Angle.find(x1, y1, x2, y2);
    assertEquals(expResult, result, 0.000001);
}