From c115c0990f22701f1d8a81ca86c225d348f41652 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sun, 26 Oct 2025 13:07:31 +0100
Subject: [PATCH 1/2] gh-133346: add tests for `_colorize.Theme` (GH-139687)
 (cherry picked from commit 37827c17526b7d3e1275861a1207be71aef6b284)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
---
 Lib/test/test__colorize.py | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Lib/test/test__colorize.py b/Lib/test/test__colorize.py
index b2f0bb1386fe5b..25012466840f18 100644
--- a/Lib/test/test__colorize.py
+++ b/Lib/test/test__colorize.py
@@ -1,4 +1,5 @@
 import contextlib
+import dataclasses
 import io
 import sys
 import unittest
@@ -21,6 +22,42 @@ def supports_virtual_terminal():
         return contextlib.nullcontext()
 
 
+class TestTheme(unittest.TestCase):
+
+    def test_attributes(self):
+        # only theme configurations attributes by default
+        for field in dataclasses.fields(_colorize.Theme):
+            with self.subTest(field.name):
+                self.assertIsSubclass(field.type, _colorize.ThemeSection)
+                self.assertIsNotNone(field.default_factory)
+
+    def test_copy_with(self):
+        theme = _colorize.Theme()
+
+        copy = theme.copy_with()
+        self.assertEqual(theme, copy)
+
+        unittest_no_colors = _colorize.Unittest.no_colors()
+        copy = theme.copy_with(unittest=unittest_no_colors)
+        self.assertEqual(copy.argparse, theme.argparse)
+        self.assertEqual(copy.difflib, theme.difflib)
+        self.assertEqual(copy.syntax, theme.syntax)
+        self.assertEqual(copy.traceback, theme.traceback)
+        self.assertEqual(copy.unittest, unittest_no_colors)
+
+    def test_no_colors(self):
+        # idempotence test
+        theme_no_colors = _colorize.Theme().no_colors()
+        theme_no_colors_no_colors = theme_no_colors.no_colors()
+        self.assertEqual(theme_no_colors, theme_no_colors_no_colors)
+
+        # attributes check
+        for section in dataclasses.fields(_colorize.Theme):
+            with self.subTest(section.name):
+                section_theme = getattr(theme_no_colors, section.name)
+                self.assertEqual(section_theme, section.type.no_colors())
+
+
 class TestColorizeFunction(unittest.TestCase):
     def test_colorized_detection_checks_for_environment_variables(self):
         def check(env, fallback, expected):

From 5c31942f86e06794a5d7d015ba3af1624ff47fe2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sun, 26 Oct 2025 13:23:16 +0100
Subject: [PATCH 2/2] Remove redundant assertion for difflib

---
 Lib/test/test__colorize.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Lib/test/test__colorize.py b/Lib/test/test__colorize.py
index 25012466840f18..3ac89987f91e44 100644
--- a/Lib/test/test__colorize.py
+++ b/Lib/test/test__colorize.py
@@ -40,7 +40,6 @@ def test_copy_with(self):
         unittest_no_colors = _colorize.Unittest.no_colors()
         copy = theme.copy_with(unittest=unittest_no_colors)
         self.assertEqual(copy.argparse, theme.argparse)
-        self.assertEqual(copy.difflib, theme.difflib)
         self.assertEqual(copy.syntax, theme.syntax)
         self.assertEqual(copy.traceback, theme.traceback)
         self.assertEqual(copy.unittest, unittest_no_colors)