test more credentials

Author: Kevin Burke

tests/test_credentials.py

@@ -1,6 +1,8 @@
-from nose.tools import assert_equal
+from nose.tools import assert_equal, assert_raises
+from mock import patch
 
-from twilio.rest import find_credentials
+from twilio import TwilioException
+from twilio.rest import TwilioRestClient, find_credentials
 
 def test_creds_not_found():
     """ I shouldn't find credentials if they are not there """
@@ -15,3 +17,8 @@ def test_find_creds():
     }
     assert_equal(find_credentials(env), ('AC123', '456'))
 
+@patch("twilio.rest.find_credentials")
+def test_creds_error(creds):
+    creds.return_value = (None, None)
+    assert_raises(TwilioException, TwilioRestClient)
+