mock is required for Python < 3.3

sdk/identity/azure-identity/HISTORY.md

@@ -5,8 +5,11 @@ Breaking changes:
 - Removed `Configuration` from the public API in prepration for entirely
 kwargs-based configuration. Static `create_config` methods have been renamed
 `_create_config`, and will be removed entirely in a future release.
-- This version of the library requires [`azure-core`](https://pypi.org/project/azure-core/)
-1.0.0b2 and [MSAL](https://pypi.org/project/msal/) 0.4.1
+
+Dependency changes:
+- Updated [`azure-core`](https://pypi.org/project/azure-core/) to 1.0.0b2
+- Updated [MSAL](https://pypi.org/project/msal/) 0.4.1
+- New dependency for Python 2.7: [mock](https://pypi.org/project/mock/)
 
 New credentials:
 - Added credentials for authenticating users:

sdk/identity/azure-identity/setup.py

@@ -70,5 +70,9 @@
         ]
     ),
     install_requires=["azure-core<2.0.0,>=1.0.0b2", "cryptography>=2.1.4", "msal~=0.4.1", "six>=1.6"],
-    extras_require={":python_version<'3.0'": ["azure-nspkg"], ":python_version<'3.5'": ["typing"]},
+    extras_require={
+        ":python_version<'3.0'": ["azure-nspkg"],
+        ":python_version<'3.3'": ["mock"],
+        ":python_version<'3.5'": ["typing"],
+    },
 )