issue #41: add unit tests for phone_number format checking

tests/test_inspection.py

@@ -298,6 +298,22 @@ def test_registration_number_mixed_format(self):
         instance = FertilizerInspection(registration_number="12A34567B")
         self.assertIsNone(instance.registration_number)
 
+class TestFertilizerInspectionPhoneNumberFormat(unittest.TestCase):
+    def test_phone_number_with_country_code(self):
+        instance = FertilizerInspection(company_phone_number="1-800-640-9605")
+        self.assertEqual(instance.company_phone_number, "800-640-9605")
+
+    def test_phone_number_with_parentheses(self):
+        instance = FertilizerInspection(manufacturer_phone_number="(757) 123-4567, (800) 456-7890")
+        self.assertEqual(instance.manufacturer_phone_number, "757-123-4567")
+
+    def test_phone_number_with_parentheses_and_country_code(self):
+        instance = FertilizerInspection(manufacturer_phone_number="+1 (757) 123-4567, (800) 456-7890")
+        self.assertEqual(instance.manufacturer_phone_number, "757-123-4567")
+
+    def test_phone_number_with_chars(self):
+        instance = FertilizerInspection(manufacturer_phone_number="+1 800 123-4567 FAX")
+        self.assertEqual(instance.manufacturer_phone_number, "800-123-4567")
 
 if __name__ == "__main__":
     unittest.main()