Trim short test summary lines to the terminal width when color is enabled

AUTHORS

@@ -204,6 +204,7 @@ Gregory Lee
 Grig Gheorghiu
 Grigorii Eremeev (budulianin)
 Guido Wesdorp
+Guillaume Marty
 Guoqiang Zhang
 hfycium
 Hamza Mobeen

changelog/15216.bugfix.rst

@@ -0,0 +1 @@
+The lines of the "short test summary info" section are now trimmed to the terminal width when color output is enabled -- previously the color escape codes broke the width computation, so the lines overflowed the terminal.

src/_pytest/terminal.py

@@ -18,6 +18,7 @@
 import inspect
 from pathlib import Path
 import platform
+import re
 import sys
 import textwrap
 from typing import Any
@@ -1571,6 +1572,10 @@ def _format_trimmed(format: str, msg: str, available_width: int) -> str | None:
     return format.format(msg)
 
 
+# Escape sequences added by TerminalWriter.markup(), which take no columns.
+_ANSI_ESCAPE_SEQ = re.compile(r"\x1b\[[\d;]*m")
+
+
 def _get_line_with_reprcrash_message(
     config: Config, rep: BaseReport, tw: TerminalWriter, word_markup: dict[str, bool]
 ) -> str:
@@ -1582,7 +1587,7 @@ def _get_line_with_reprcrash_message(
     node = _get_node_id_with_markup(tw, config, rep)
 
     line = f"{word} {node}"
-    line_width = wcswidth(line)
+    line_width = wcswidth(_ANSI_ESCAPE_SEQ.sub("", line))
 
     msg: str | None
     try:

testing/test_terminal.py

@@ -6,6 +6,7 @@
 from io import StringIO
 import os
 from pathlib import Path
+import re
 import sys
 import textwrap
 from types import SimpleNamespace
@@ -1409,6 +1410,27 @@ def test_fail_extra_reporting(
     )
 
 
+def test_fail_extra_reporting_truncation_with_color(
+    pytester: Pytester, monkeypatch: MonkeyPatch
+) -> None:
+    """The short summary line is trimmed to the terminal width also when
+    color is enabled: the escape codes of the markup take no columns."""
+    monkeypatch.delenv("CI", raising=False)
+    monkeypatch.setenv("COLUMNS", "80")
+    pytester.makepyfile("def test_this(): assert 0, 'this_failed' * 100")
+
+    def summary_lines(*args: str) -> list[str]:
+        result = pytester.runpytest(*args)
+        lines = [re.sub(r"\x1b\[[\d;]*m", "", line) for line in result.stdout.lines]
+        return [line for line in lines if line.startswith("FAILED ")]
+
+    expected = summary_lines("--color=no")
+    assert len(expected) == 1
+    assert expected[0].endswith(" - Assert...")
+    assert len(expected[0]) == 80
+    assert summary_lines("--color=yes") == expected
+
+
 def test_fail_reporting_on_pass(pytester: Pytester) -> None:
     pytester.makepyfile("def test_this(): assert 1")
     result = pytester.runpytest("-rf")