Merge pull request #69 from chlowell/patch-1

Handle file not found exceptions on Python 2.7

Author: rayluo

msal_extensions/token_cache.py

@@ -35,7 +35,7 @@ def _reload_if_necessary(self):
             if self._last_sync < self._persistence.time_last_modified():
                 self.deserialize(self._persistence.load())
                 self._last_sync = time.time()
-        except IOError as exp:
+        except EnvironmentError as exp:
             if exp.errno != errno.ENOENT:
                 raise
             # Otherwise, from cache's perspective, a nonexistent file is a NO-OP

tests/test_agnostic_backend.py

@@ -44,3 +44,8 @@ def test_current_platform_cache_roundtrip_with_alias_class(temp_location):
 def test_persisted_token_cache(temp_location):
     _test_token_cache_roundtrip(PersistedTokenCache(FilePersistence(temp_location)))
 
+def test_file_not_found_error_is_not_raised():
+    persistence = FilePersistence('non_existing_file')
+    cache = PersistedTokenCache(persistence=persistence)
+    # An exception raised here will fail the test case as it is supposed to be a NO-OP
+    cache.find('')