add test coverage for no_cursor_timeout to support recent fix

mongoengine/queryset/base.py

@@ -1576,6 +1576,7 @@ class BaseQuerySet(object):
         if self._snapshot:
             msg = "The snapshot option is not anymore available with PyMongo 3+"
             warnings.warn(msg, DeprecationWarning)
+
         cursor_args = {}
         if not self._timeout:
             cursor_args["no_cursor_timeout"] = True

tests/queryset/test_queryset.py

@@ -5809,9 +5809,19 @@ class TestQueryset(unittest.TestCase):
         self.Person.objects.create(name="Baz")
         self.assertEqual(self.Person.objects.count(with_limit_and_skip=True), 3)
 
-        newPerson = self.Person.objects.create(name="Foo_1")
+        self.Person.objects.create(name="Foo_1")
         self.assertEqual(self.Person.objects.count(with_limit_and_skip=True), 4)
 
+    def test_no_cursor_timeout(self):
+        qs = self.Person.objects()
+        self.assertEqual(qs._cursor_args, {})  # ensure no regression of  #2148
+
+        qs = self.Person.objects().timeout(True)
+        self.assertEqual(qs._cursor_args, {})
+
+        qs = self.Person.objects().timeout(False)
+        self.assertEqual(qs._cursor_args, {"no_cursor_timeout": True})
+
 
 if __name__ == "__main__":
     unittest.main()