Edits.

Author: WaVEV

tests/basic_/tests.py

@@ -1,3 +1,5 @@
+from operator import attrgetter
+
 from django.db.models import Value
 from django.test import TestCase
 
@@ -80,12 +82,12 @@ def test_update_tuple_value(self):
 
 class QueryDollarPrefixTests(MongoTestCaseMixin, TestCase):
     def test_query_injection(self):
-        """$-prefixed Value() expressions are correctly handled on update."""
+        """$-prefixed Value() expressions are correctly handled on query."""
         Author.objects.create(name="Gustavo")
         Author.objects.create(name="Walter")
         with self.assertNumQueries(1) as ctx:
             qs = list(Author.objects.annotate(a_value=Value("$name")))
-        self.assertTrue(all(v.a_value == "$name" for v in qs))
+        self.assertQuerySetEqual(qs, ["$name"] * 2, attrgetter("a_value"))
         self.assertAggregateQuery(
             ctx.captured_queries[0]["sql"],
             "basic__author",