def test_sickness_with_empty_string(self):
		self.assertFalse(Donor.is_valid_sickness(''))
	def test_sickness_with_number(self):
		self.assertFalse(Donor.is_valid_sickness('2'))
	def test_sickness_with_valid_string_upper(self):
		self.assertTrue(Donor.is_valid_sickness('N'))