def test_average_speed_per_second_raises_exception_when_distance_equals_zero(self):
# Arrange
start = datetime.now(pytz.utc)
finish = start + timedelta(seconds=1)
# Act
with self.assertRaises(ValueError) as context:
compute.average_speed_per_second(start, finish, 0)
# Assert
self.assertEqual(context.exception.message,
'Track distance must be greater than zero!')
def test_average_speed_per_second_raises_exception_when_finish_less_than_start(self):
# Arrange
finish = datetime.now(pytz.utc)
start = finish + timedelta(seconds=1)
# Act & Assert
with self.assertRaises(ValueError) as context:
compute.average_speed_per_second(start, finish, 10)
# Assert
self.assertEqual(context.exception.message,
'Start time must be before finish time!')
def test_average_speed_per_second_returns_none_when_no_finish(self):
# Arrange
start = datetime.now(pytz.utc)
# Act
avg_sps = compute.average_speed_per_second(start, None, 10)
# Assert
self.assertEqual(None, avg_sps)
def test_average_speed_per_second_returns_5mps_50m_in_10s(self):
# Arrange
start = datetime.now(pytz.utc)
finish = start + timedelta(seconds=10)
# Act
avg_sps = compute.average_speed_per_second(start, finish, 50)
# Assert
self.assertEqual(5, avg_sps)
