diff --git a/tests/test_permissions.py b/tests/test_permissions.py
index aefff981ee..39b7ed6622 100644
--- a/tests/test_permissions.py
+++ b/tests/test_permissions.py
@@ -716,3 +716,59 @@ def has_object_permission(self, request, view, obj):
composed_perm = (IsAuthenticatedUserOwner | permissions.IsAdminUser)
hasperm = composed_perm().has_object_permission(request, None, None)
assert hasperm is False
+
+ def test_operand_holder_is_hashable(self):
+ assert hash((permissions.IsAuthenticated & permissions.IsAdminUser))
+
+ def test_operand_holder_hash_same_for_same_operands_and_operator(self):
+ first_operand_holder = (
+ permissions.IsAuthenticated & permissions.IsAdminUser
+ )
+ second_operand_holder = (
+ permissions.IsAuthenticated & permissions.IsAdminUser
+ )
+
+ assert hash(first_operand_holder) == hash(second_operand_holder)
+
+ def test_operand_holder_hash_differs_for_different_operands(self):
+ first_operand_holder = (
+ permissions.IsAuthenticated & permissions.IsAdminUser
+ )
+ second_operand_holder = (
+ permissions.AllowAny & permissions.IsAdminUser
+ )
+ third_operand_holder = (
+ permissions.IsAuthenticated & permissions.AllowAny
+ )
+
+ assert hash(first_operand_holder) != hash(second_operand_holder)
+ assert hash(first_operand_holder) != hash(third_operand_holder)
+ assert hash(second_operand_holder) != hash(third_operand_holder)
+
+ def test_operand_holder_hash_differs_for_different_operators(self):
+ first_operand_holder = (
+ permissions.IsAuthenticated & permissions.IsAdminUser
+ )
+ second_operand_holder = (
+ permissions.IsAuthenticated | permissions.IsAdminUser
+ )
+
+ assert hash(first_operand_holder) != hash(second_operand_holder)
+
+ def test_filtering_permissions(self):
+ unfiltered_permissions = [
+ permissions.IsAuthenticated & permissions.IsAdminUser,
+ permissions.IsAuthenticated & permissions.IsAdminUser,
+ permissions.AllowAny,
+ ]
+ expected_permissions = [
+ permissions.IsAuthenticated & permissions.IsAdminUser,
+ permissions.AllowAny,
+ ]
+
+ filtered_permissions = [
+ perm for perm
+ in dict.fromkeys(unfiltered_permissions)
+ ]
+
+ assert filtered_permissions == expected_permissions
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