Test more attributes (#1526)

To increase coverage, sprinkle in some asserts for attributes that were
not checked -- this uncovered a bug in Issue that two attributes were
not properly initialized to NotSet.

github/Issue.py

@@ -612,6 +612,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         return self.number
 
     def _initAttributes(self):
+        self._active_lock_reason = github.GithubObject.NotSet
         self._assignee = github.GithubObject.NotSet
         self._assignees = github.GithubObject.NotSet
         self._body = github.GithubObject.NotSet
@@ -625,6 +626,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         self._id = github.GithubObject.NotSet
         self._labels = github.GithubObject.NotSet
         self._labels_url = github.GithubObject.NotSet
+        self._locked = github.GithubObject.NotSet
         self._milestone = github.GithubObject.NotSet
         self._number = github.GithubObject.NotSet
         self._pull_request = github.GithubObject.NotSet

tests/Issue.py

@@ -80,6 +80,8 @@ class Issue(Framework.TestCase):
         self.assertEqual(
             self.issue.url, "https://api.github.com/repos/jacquev6/PyGithub/issues/28"
         )
+        self.assertFalse(self.issue.locked)
+        self.assertIsNone(self.issue.active_lock_reason)
         self.assertEqual(self.issue.user.login, "jacquev6")
         self.assertEqual(self.issue.repository.name, "PyGithub")
         self.assertEqual(

tests/RepositoryKey.py

@@ -55,6 +55,7 @@ class RepositoryKey(Framework.TestCase):
         )
         self.assertEqual(self.key.created_at, datetime.datetime(2017, 2, 22, 8, 16, 23))
         self.assertTrue(self.key.verified)
+        self.assertTrue(self.key.read_only)
         self.assertEqual(
             repr(self.key), 'RepositoryKey(title="PyGithub Test Key", id=21870881)'
         )