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[3.13] gh-155974: Add a test for the window attributes after a failed write #156566

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Merged
serhiy-storchaka merged 1 commit into from
Aug 29, 2026
+20 −0
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[3.13] gh-155974: Add a test for the window attributes after a failed write #156566

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20 changes: 20 additions & 0 deletions Lib/test/test_curses.py
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Original file line number Diff line number Diff line change
Expand Up @@ -434,6 +434,26 @@ def test_output_string_embedded_null_chars(self):
self.assertRaises(ValueError, stdscr.insstr, arg)
self.assertRaises(ValueError, stdscr.insnstr, arg, 1)

def test_output_string_attr_restored(self):
# A write with an attr restores the window rendition afterwards,
# whether it succeeded or failed.
win = curses.newwin(2, 10, 0, 0)
def current_attrs():
# Write a cell with the window's current rendition and read it
# back, so that the rendition itself is checked.
win.addstr(1, 0, ' ')
return win.inch(1, 0) & curses.A_ATTRIBUTES
for func, args in [(win.addstr, ('x',)), (win.addnstr, ('x', 1)),
(win.insstr, ('x',)), (win.insnstr, ('x', 1))]:
with self.subTest(func.__qualname__):
win.attrset(curses.A_UNDERLINE)
# y=100 is outside the window, so the write fails.
self.assertRaises(curses.error, func, 100, 0, *args,
curses.A_BOLD)
self.assertEqual(current_attrs(), curses.A_UNDERLINE)
func(0, 0, *args, curses.A_BOLD)
self.assertEqual(current_attrs(), curses.A_UNDERLINE)

def test_add_string_behavior(self):
# addstr() advances the cursor past the written text; addnstr()
# writes at most n characters.
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