From a50207d8906be545fb8e1e44e7947d7cd4768786 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 20 Jun 2026 08:17:03 +0200
Subject: [PATCH] [3.13] gh-151678: Add tests for tkinter.scrolledtext
 (GH-151753) (GH-151761)

Add a test for the ScrolledText widget, which had no tests: that it is
a Text widget held in a Frame with a Scrollbar, that Text methods work,
that the geometry manager methods are redirected to the frame while
configure is not, and that the scrollbar tracks the text view.
(cherry picked from commit a9db5cb52fefffc8fcdddc8e1c5f23222970825a)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 Lib/test/test_tkinter/test_scrolledtext.py | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Lib/test/test_tkinter/test_scrolledtext.py

diff --git a/Lib/test/test_tkinter/test_scrolledtext.py b/Lib/test/test_tkinter/test_scrolledtext.py
new file mode 100644
index 00000000000..913e7d8aab6
--- /dev/null
+++ b/Lib/test/test_tkinter/test_scrolledtext.py
@@ -0,0 +1,65 @@
+import unittest
+import tkinter
+from tkinter.scrolledtext import ScrolledText
+from test.support import requires
+from test.test_tkinter.support import setUpModule  # noqa: F401
+from test.test_tkinter.support import AbstractTkTest
+
+requires('gui')
+
+
+class ScrolledTextTest(AbstractTkTest, unittest.TestCase):
+
+    def create(self, **kwargs):
+        st = ScrolledText(self.root, **kwargs)
+        self.addCleanup(st.destroy)
+        return st
+
+    def test_create(self):
+        st = self.create(background='red', height=5)
+        # It is a Text widget held in a Frame together with a Scrollbar.
+        self.assertIsInstance(st, tkinter.Text)
+        self.assertIsInstance(st.frame, tkinter.Frame)
+        self.assertIsInstance(st.vbar, tkinter.Scrollbar)
+        self.assertEqual(st.winfo_parent(), str(st.frame))
+        # str() returns the frame, so that geometry managers manage it.
+        self.assertEqual(str(st), str(st.frame))
+        # Keyword options configure the Text.
+        self.assertEqual(str(st['background']), 'red')
+        self.assertEqual(st['height'], 5 if self.wantobjects else '5')
+
+    def test_text_methods(self):
+        st = self.create()
+        st.insert('1.0', 'hello\nworld')
+        self.assertEqual(st.get('1.0', 'end-1c'), 'hello\nworld')
+        self.assertEqual(st.index('end-1c'), '2.5')
+        st.delete('1.0', 'end')
+        self.assertEqual(st.get('1.0', 'end-1c'), '')
+
+    def test_geometry_methods(self):
+        st = self.create()
+        # configure is not redirected; it configures the Text.
+        st.configure(height=8)
+        self.assertEqual(st['height'], 8 if self.wantobjects else '8')
+        # Pack, Grid and Place methods are redirected to the frame.
+        st.pack()
+        self.root.update()
+        self.assertEqual(st.frame.winfo_manager(), 'pack')
+        self.assertEqual(st.pack_info(), st.frame.pack_info())
+        st.pack_forget()
+        self.assertEqual(st.frame.winfo_manager(), '')
+
+    def test_scrollbar(self):
+        st = self.create(height=5)
+        st.pack()
+        st.insert('1.0', '\n'.join(map(str, range(100))))
+        self.root.update()
+        # The scrollbar tracks the text view.
+        self.assertEqual(st.vbar.get(), st.yview())
+        st.yview_moveto(1.0)
+        self.root.update()
+        self.assertEqual(st.vbar.get()[1], 1.0)
+
+
+if __name__ == "__main__":
+    unittest.main()