Clock angle

clock_angle.py

import unittest
from math import pi, degrees

def get_hour_angle(hour, minute=0):
    angle = (hour / 6.) * pi
    minute_angle = get_minute_angle(minute) / 12
    return angle + minute_angle

def get_minute_angle(minute):
    angle = (minute / 30.) * pi
    return angle

def clock_angle(minute):
    hour, minute = (minute / 60, minute % 60)
    angle = abs(get_hour_angle(hour, minute) - get_minute_angle(minute))
    if angle > pi:
        angle = 2 * pi - angle
    return angle


class ClockAngleTest(unittest.TestCase):
    def test_get_hour_angle(self):
        self.assertEqual(get_hour_angle(0), 0)
        self.assertEqual(get_hour_angle(3), pi/2)
        self.assertEqual(get_hour_angle(6), pi)
        self.assertEqual(get_hour_angle(12), 2 * pi)
        self.assertEqual(get_hour_angle(18), pi)

    def test_get_minute_angle(self):
        self.assertEqual(get_minute_angle(0), 0)
        self.assertEqual(get_minute_angle(30), pi)

    def test_get_clock_angle(self):
        self.assertEqual(clock_angle(0), 0)
        self.assertEqual(clock_angle(360), pi)
        self.assertEqual(clock_angle(180), pi/2)
        self.assertEqual(clock_angle(210), pi - (pi/2) - (pi/12))
        self.assertEqual(round(degrees(clock_angle(140))), 50)

if __name__ == '__main__':
    unittest.main()