add deprecation warning, add warning test

Author: rajumsys

sparkpost/transmissions.py

@@ -1,6 +1,7 @@
 import base64
 import copy
 import json
+import warnings
 from email.utils import parseaddr
 
 from .base import Resource
@@ -275,6 +276,7 @@ def list(self, **kwargs):
         :returns: list of transmissions
         :raises: :exc:`SparkPostAPIException` if API call fails
         """
+        warnings.warn('deprecated', DeprecationWarning)
         return self.request('GET', self.uri, params=kwargs)
 
     def delete(self, transmission_id):

test/test_transmissions.py

@@ -2,6 +2,7 @@
 import json
 import os
 import tempfile
+import warnings
 
 import pytest
 import responses
@@ -306,8 +307,12 @@ def test_success_list():
         body='{"results": []}'
     )
     sp = SparkPost('fake-key')
-    response = sp.transmission.list()
-    assert response == []
+    with warnings.catch_warnings(record=True) as warns:
+        warnings.simplefilter("always")
+        response = sp.transmission.list()
+        assert response == []
+        assert len(warns) == 1
+        assert "deprecated" in str(warns[-1].message)
 
 
 @responses.activate