use AssertRaises as context manager

Co-authored-by: Alex Waygood <[email protected]>

Author: 2 people

tests/test_api.py

@@ -180,6 +180,10 @@ def test_entry_points_groups_get(self):
             entry_points().get('entries', 'default') == entry_points()['entries']
             entry_points().get('missing', ()) == ()
 
+    def test_entry_points_allows_no_attributes(self):
+        with self.assertRaises(AttributeError):
+            entry_points()['entries'][0].foo = 4
+
     def test_metadata_for_this_package(self):
         md = metadata('egginfo-pkg')
         assert md['author'] == 'Steven Ma'