diff --git a/.travis.yml b/.travis.yml
index 336824d..6854e61 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ python:
   - '3.4'
   - '3.5'
   - '3.6'
+  - '3.7'
 before_install:
   - pip install -r requirements.txt
 script:
diff --git a/tests/v3_tests.py b/tests/v3_tests.py
index ba73983..39b34e0 100644
--- a/tests/v3_tests.py
+++ b/tests/v3_tests.py
@@ -30,7 +30,7 @@ class TestVersion3(unittest.TestCase):
             'https://epoqwieqwpoieqpwoeiqpwoeiq.retailcrm.ru', '98sdf9sj8fsd9fjs9dfjs98')
         response = client.statistic_update()
 
-        self.assertTrue(response.is_successful(), False)
+        self.assertIsNot(response.is_successful(), True)
         self.assertEqual(response.get_error_msg(), 'Account does not exist.')
 
     def test_wrong_api_key(self):
diff --git a/tests/v4_tests.py b/tests/v4_tests.py
index b444819..87a3c27 100644
--- a/tests/v4_tests.py
+++ b/tests/v4_tests.py
@@ -30,7 +30,7 @@ class TestVersion4(unittest.TestCase):
             'https://epoqwieqwpoieqpwoeiqpwoeiq.retailcrm.ru', '98sdf9sj8fsd9fjs9dfjs98')
         response = client.statistic_update()
 
-        self.assertTrue(response.is_successful(), False)
+        self.assertIsNot(response.is_successful(), True)
         self.assertEqual(response.get_error_msg(), 'Account does not exist.')
 
     def test_wrong_api_key(self):
diff --git a/tests/v5_tests.py b/tests/v5_tests.py
index ce27af9..03eef87 100644
--- a/tests/v5_tests.py
+++ b/tests/v5_tests.py
@@ -30,7 +30,7 @@ class TestVersion5(unittest.TestCase):
             'https://epoqwieqwpoieqpwoeiqpwoeiq.retailcrm.ru', '98sdf9sj8fsd9fjs9answer98')
         response = client.statistic_update()
 
-        self.assertTrue(response.is_successful(), False)
+        self.assertIsNot(response.is_successful(), True)
         self.assertEqual(response.get_error_msg(), 'Account does not exist.')
 
     def test_wrong_api_key(self):
@@ -67,33 +67,6 @@ class TestVersion5(unittest.TestCase):
 
         self.assertTrue(response.is_successful(), True)
 
-    # def test_telephony_calls_upload(self):
-    #     """
-    #     V5 Test telephony calls upload
-    #     """
-    #
-    #     calls = [
-    #         {
-    #             'date': '2018-04-20 22:10:00',
-    #             'type': 'in',
-    #             'phone': '+79999999999',
-    #             'userId': os.getenv('RETAILCRM_USER'),
-    #             'result': 'answered'
-    #          },
-    #         {
-    #             'date': '2018-04-20 22:10:00',
-    #             'type': 'out',
-    #             'phone': '+79999999999',
-    #             'userId': os.getenv('RETAILCRM_USER'),
-    #             'result': 'answered'
-    #         }
-    #     ]
-    #
-    #     response = self.client.telephony_calls_upload(calls)
-    #
-    #     self.assertTrue(response.is_successful(), True)
-    #     self.assertTrue(response.get_status_code() < 400, True)
-
     def test_set_user_status(self):
         response = self.client.user_status(os.getenv('RETAILCRM_USER'), 'dinner')