Align test_str with CPython and move local coverage

Copilot · youknowone · youknowone · commit 9a11d44a5c63 · 2026-03-29T04:33:46.000+09:00
Co-authored-by: youknowone &lt;69878+youknowone@users.noreply.github.com&gt;
diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
@@ -2440,10 +2440,6 @@ def __str__(self):
         self.assertTypedEqual(StrSubclass(StrWithStr(OtherStrSubclass('abc'))),
                               StrSubclass('abc'))
 
-        str_value = StrSubclass('abc')
-        self.assertIs(str(WithStr(str_value)), str_value)
-        self.assertIs(str(StrWithStr(str_value)), str_value)
-
         self.assertTypedEqual(str(WithRepr('<abc>')), '<abc>')
         self.assertTypedEqual(str(WithRepr(StrSubclass('<abc>'))), StrSubclass('<abc>'))
         self.assertTypedEqual(StrSubclass(WithRepr('<abc>')), StrSubclass('<abc>'))
@@ -2452,9 +2448,6 @@ def __str__(self):
         self.assertTypedEqual(StrSubclass(WithRepr(OtherStrSubclass('<abc>'))),
                               StrSubclass('<abc>'))
 
-        repr_value = StrSubclass('<abc>')
-        self.assertIs(str(WithRepr(repr_value)), repr_value)
-
     def test_unicode_repr(self):
         class s1:
             def __repr__(self):
diff --git a/extra_tests/snippets/builtin_str_subclass.py b/extra_tests/snippets/builtin_str_subclass.py
@@ -19,6 +19,33 @@ def __init__(self, value):
 assert y + " other" == "1 other"
 assert y.x == "substr"
 
+
+class ReprStrSubclass(str):
+    pass
+
+
+class WithStr:
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return self.value
+
+
+class WithRepr:
+    def __init__(self, value):
+        self.value = value
+
+    def __repr__(self):
+        return self.value
+
+
+str_value = ReprStrSubclass("abc")
+assert str(WithStr(str_value)) is str_value
+
+repr_value = ReprStrSubclass("<abc>")
+assert str(WithRepr(repr_value)) is repr_value
+
 ## Base strings currently get an attribute dict, but shouldn't.
 # with assert_raises(AttributeError):
 #     "hello".x = 5
