Replaced type-specific assertions with assertEqual().

Python docs say, "it's usually not necessary to invoke these methods directly."

tests/foreign_object/test_empty_join.py

@@ -21,7 +21,7 @@ class RestrictedConditionsTests(TestCase):
         use any joining columns, as long as an extra restriction is supplied.
         """
         a = SlugPage.objects.get(slug='a')
-        self.assertListEqual(
+        self.assertEqual(
             [p.slug for p in SlugPage.objects.filter(ascendants=a)],
             ['a', 'a/a', 'a/b', 'a/b/a'],
         )
@@ -31,11 +31,11 @@ class RestrictedConditionsTests(TestCase):
         )
 
         aba = SlugPage.objects.get(slug='a/b/a')
-        self.assertListEqual(
+        self.assertEqual(
             [p.slug for p in SlugPage.objects.filter(descendants__in=[aba])],
             ['a', 'a/b', 'a/b/a'],
         )
-        self.assertListEqual(
+        self.assertEqual(
             [p.slug for p in aba.ascendants.all()],
             ['a', 'a/b', 'a/b/a'],
         )