test symmetry of intersection

bostonrwalker · Aug 29, 2022 · 00c34e6 · 00c34e6
1 parent d0f7ab2
commit 00c34e6
Showing 1 changed file with 10 additions and 7 deletions.
diff --git a/tests/version/test_markers.py b/tests/version/test_markers.py
@@ -612,18 +612,21 @@ def test_marker_union_intersect_marker_union_drops_unnecessary_markers() -> None
 
 
 def test_marker_union_intersect_multi_marker() -> None:
-    m = parse_marker('sys_platform == "darwin" or python_version < "3.4"')
+    m1 = parse_marker('sys_platform == "darwin" or python_version < "3.4"')
+    m2 = parse_marker('implementation_name == "cpython" and os_name == "Windows"')
 
-    intersection = m.intersect(
-        parse_marker('implementation_name == "cpython" and os_name == "Windows"')
-    )
-    assert (
-        str(intersection)
-        == 'implementation_name == "cpython" and os_name == "Windows" and sys_platform'
+    expected = (
+        'implementation_name == "cpython" and os_name == "Windows" and sys_platform'
         ' == "darwin" or implementation_name == "cpython" and os_name == "Windows"'
         ' and python_version < "3.4"'
     )
 
+    intersection = m1.intersect(m2)
+    assert str(intersection) == expected
+
+    intersection = m2.intersect(m1)
+    assert str(intersection) == expected
+
 
 def test_marker_union_union_with_union() -> None:
     m = parse_marker('sys_platform == "darwin" or python_version < "3.4"')