Fix use of union notation for Python < 3.10

iguala/helpers.py

@@ -1,14 +1,24 @@
-from __future__ import annotations
 from collections.abc import MutableSet
 from itertools import chain
-from types import UnionType
+
+try:
+    from types import UnionType
+
+    def is_union(o):
+        return isinstance(o, UnionType)
+
+except ImportError:
+    from typing import Union, get_origin
+
+    def is_union(o):
+        return get_origin(o) is Union
 
 
 class match(object):
     def __init__(self, cls, *classes):
         from .matchers import ObjectMatcher
 
-        if isinstance(cls, UnionType):
+        if is_union(cls):
             all_classes = cls.__args__
         else:
             all_classes = [cls, *classes]

tests/test_object_matchers.py

@@ -1,4 +1,6 @@
+import pytest
 from iguala import as_matcher, match
+import sys
 
 from .data_for_tests import ATest, BTest, InnerTest, obj_test
 
@@ -145,6 +147,7 @@ def test_match_multiple_types():
     assert pattern.match(BTest(0, 0, 'foo', InnerTest('bar', 5), [], 5)).is_match is True
 
 
+@pytest.mark.skipif(sys.version_info < (3, 10), reason="Union notation is not available for Python < 3.10")
 def test_match_union_type():
     pattern = match(ATest) % {}
     assert pattern.match(BTest(0, 0, 'foo', InnerTest('bar', 5), [], 5)).is_match is False