def test_number_of_days_non_leap_century(self):
		cal = Month(2, 1900)
		self.assertEqual(28, cal.days_number())
	def test_number_of_days_february(self):
		cal = Month(2, 1995)
		self.assertEqual(28, cal.days_number())
	def test_number_of_days_leap_year(self):
		cal = Month(2, 1996)
		self.assertEqual(29, cal.days_number())
	def test_number_of_days(self):
		cal = Month(6, 1900)
		self.assertEqual(30, cal.days_number())