new unit test

tests/unit/test_client.py

@@ -10,8 +10,11 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
+import os
 from contextlib import closing
 
+import pytest
+
 import botocore
 import botocore.config
 from botocore import client, exceptions, hooks
@@ -1617,6 +1620,17 @@ def test_sslCommonName_warning(self):
             )
             self.assertEqual(len(warning.warnings), 1)
 
+    @mock.patch.dict(os.environ, {'BOTO_DISABLE_COMMONNAME': 'true'})
+    def test_BOTO_DISABLE_COMMONNAME(self):
+        creator = self.create_client_creator()
+        self.endpoint_data['sslCommonName'] = 'bar'
+
+        with pytest.warns(None) as warning:
+            creator.create_client(
+                'myservice', 'us-west-2', credentials=self.credentials
+            )
+            self.assertEqual(len(warning), 0)
+
 
 class TestClientErrors(TestAutoGeneratedClient):
     def add_error_response(self, error_response):