def test_basic_solar_declination(self):
"""Test the calc of declination for different days of the year"""
day_of_year = [1, 10, 100, 365]
expected_result = [-23.1223537018, -22.1987731152,
7.20726681123, -23.2078460336]
for i, dayval in enumerate(day_of_year):
result = calc_solar_declination(dayval)
self.assertIsInstance(result, float)
self.assertAlmostEqual(result, expected_result[i])
def test_solar_dec_raises_exception(self):
"""Test an exception is raised if latitudes out of range"""
day_of_year = -1
msg = 'Day of the year must be between 0 and 365'
with self.assertRaisesRegex(ValueError, msg):
calc_solar_declination(day_of_year)
