add eq for python, update test case

samples/client/petstore/python/tests/test_pet_model.py

@@ -38,3 +38,36 @@ class PetModelTests(unittest.TestCase):
                 " 'status': 'available',\n"
                 " 'tags': [{'id': 1, 'name': None}]}")
         self.assertEqual(data, self.pet.to_str())
+
+    def test_equal(self):
+        self.pet1 = swagger_client.Pet()
+        self.pet1.name = "test name"
+        self.pet1.id = 1
+        self.pet1.photo_urls = ["string"]
+        self.pet1.status = "available"
+        cate1 = swagger_client.Category()
+        cate1.id = 1
+        cate1.name = "dog"
+        self.pet.category = cate1
+        tag1 = swagger_client.Tag()
+        tag1.id = 1
+        self.pet1.tags = [tag1]
+
+        self.pet2 = swagger_client.Pet()
+        self.pet2.name = "test name"
+        self.pet2.id = 1
+        self.pet2.photo_urls = ["string"]
+        self.pet2.status = "available"
+        cate2 = swagger_client.Category()
+        cate2.id = 1
+        cate2.name = "dog"
+        self.pet.category = cate2
+        tag2 = swagger_client.Tag()
+        tag2.id = 1
+        self.pet2.tags = [tag2]
+
+        self.assertTrue(self.pet1 == self.pet2)
+
+        # reset pet1 tags to empty array so that object comparison returns false
+        self.pet1.tags = []
+        self.assertFalse(self.pet1 == self.pet2)