Issue #712. Add api_mock decorator factory for mocking w/ fixtures.

webcompat/helpers.py

@@ -308,3 +308,23 @@ def get_comment_data(request_data):
     of a request's data object.'''
     comment_data = json.loads(request_data)
     return json.dumps({"body": comment_data['rawBody']})
+
+
+def api_mock(mock_endpoint):
+    '''Decorator factory for mocking out API reponses
+
+    This allows us to send back fixture files when in TESTING mode, rather
+    than making API requests over the network. See /api/endponts.py
+    for usage.'''
+    def wrap(func):
+        def wrapped_func(*args, **kwargs):
+            if app.config['TESTING']:
+                # Note, this file path is relative to helpers.py
+                file = open(os.path.join(os.path.dirname(__file__),
+                                         os.pardir,
+                                         'tests/fixtures',
+                                         mock_endpoint))
+                return file.read()
+            return func(*args, **kwargs)
+        return wrapped_func
+    return wrap