Correctly deal when PaginatedList's data is a dict (#2084)

When calculating totalCount for a PaginatedList, if a Link header is not
in the returned data, we use len() to calculate the number of items.
PullRequest.get_review_requests() actually returns a dictionary, which
neatly defeats this naive method. Peer inside the dictionary in this
case, and add a test case.

Fixes #2053

github/PaginatedList.py

@@ -153,6 +153,8 @@ def totalCount(self):
                 if data and "total_count" in data:
                     self.__totalCount = data["total_count"]
                 elif data:
+                    if isinstance(data, dict):
+                        data = data[self.__list_item]
                     self.__totalCount = len(data)
                 else:
                     self.__totalCount = 0

tests/PaginatedList.py

@@ -273,6 +273,15 @@ def testTotalCountWithNoLastPage(self):
         repos = self.g.get_repos()
         self.assertEqual(0, repos.totalCount)
 
+    def testTotalCountWithDictionary(self):
+        # PullRequest.get_review_requests() actually returns a dictionary that
+        # we fudge into two lists, which means data is a dict, not a list.
+        # We should check the member, not data itself for totalCount.
+        pr = self.g.get_repo("PyGithub/PyGithub").get_pull(2078)
+        review_requests = pr.get_review_requests()
+        self.assertEqual(review_requests[0].totalCount, 0)
+        self.assertEqual(review_requests[1].totalCount, 0)
+
     def testCustomPerPage(self):
         self.assertEqual(self.g.per_page, 30)
         self.g.per_page = 100