def test_calc_speed(self):
sample = Sample()
self.assertEqual(sample.calc_speed(distance=10.0, elapsed_time=2.0),
5.0)
self.assertEqual(sample.calc_speed(distance=10, elapsed_time=2), 5.0)
self.assertEqual(sample.calc_speed(distance=10, elapsed_time=4), 2.5)
self.assertEqual(sample.calc_speed(distance=0, elapsed_time=2), 0.0)
def test_calc_speed_invalid_value(self):
sample = Sample()
with self.assertRaises(ValueError):
sample.calc_speed(distance=10, elapsed_time=0)
with self.assertRaises(ValueError):
sample.calc_speed(distance=10, elapsed_time=-1)
with self.assertRaises(ValueError):
sample.calc_speed(distance=-10, elapsed_time=100)
