Strip ANSI + accept `_create(...)` in devx tests

Two version-compat fixes for the `devx` debugger
test-suite, both about matching upstream output that
got more verbose w/ recent lib releases.

ANSI stripping (`tests/devx/conftest.py`),
- Add `ansi_strip(text)` helper + `_ansi_re` pattern
  (regex per https://stackoverflow.com/a/14693789).
- Apply inside `in_prompt_msg()` + `assert_before()` so
  substring matches against REPL/traceback output stay
  robust to color leakage.
- Motivated by py3.13's colored tracebacks +
  `pdbp`/pygments highlighting leaking ANSI even when
  `PYTHON_COLORS=0` is set in the `spawn` fixture (not
  every renderer in the spawned subproc honors it).
- Replaces the longstanding inline TODO that linked
  the SO answer w/o impl'ing.

trio 0.30+ `Cancelled._create(` match (`test_debugger`),
- In `test_shield_pause` swap the two
  `"raise Cancelled._create()"` assertion patterns →
  `"raise Cancelled._create("` (open-paren form, no
  closing).
- trio >=0.30 raises a multi-line
  `raise Cancelled._create(source=.., reason=..,
  source_task=..)` w/ cancel-reason metadata, so the
  legacy bare-`()` form no longer matches. Inline
  comment documents the trio-version pivot.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

tests/devx/conftest.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 import platform
 import os
+import re
 import signal
 import time
 from typing import (
@@ -294,6 +295,26 @@ def expect(
 PROMPT = r"\(Pdb\+\)"
 
 
+# Strip terminal color / ANSI-VT100 escape sequences so
+# substring matching against REPL + traceback output stays
+# robust to color leakage — Python 3.13's colored tracebacks,
+# `pdbp`'s pygments highlighting, etc. — even when
+# `PYTHON_COLORS=0` (set in the `spawn` fixture) isn't honored
+# by every renderer in the spawned subproc.
+# Regex per https://stackoverflow.com/a/14693789
+_ansi_re: re.Pattern = re.compile(
+    r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])'
+)
+
+
+def ansi_strip(text: str) -> str:
+    '''
+    Remove ANSI/VT100 escape sequences from `text`.
+
+    '''
+    return _ansi_re.sub('', text)
+
+
 def in_prompt_msg(
     child: SpawnBase,
     parts: list[str],
@@ -313,7 +334,7 @@ def in_prompt_msg(
     '''
     __tracebackhide__: bool = False
 
-    before: str = str(child.before.decode())
+    before: str = ansi_strip(str(child.before.decode()))
     for part in parts:
         if part not in before:
             if pause_on_false:
@@ -333,9 +354,9 @@ def in_prompt_msg(
     return True
 
 
-# TODO: todo support terminal color-chars stripping so we can match
+# NB: color-char stripping (so we can match against call-stack
-# against call stack frame output from the the 'll' command the like!
+# frame output from the `ll` command and the like) is handled by
-# -[ ] SO answer for stipping ANSI codes: https://stackoverflow.com/a/14693789
+# `ansi_strip()` applied inside `in_prompt_msg()` + below.
 def assert_before(
     child: SpawnBase,
     patts: list[str],
@@ -356,7 +377,7 @@ def assert_before(
         err_on_false=True,
         **kwargs
     )
-    before: str = str(child.before.decode())
+    before: str = ansi_strip(str(child.before.decode()))
     return before
 
 

tests/devx/test_debugger.py

@@ -1186,7 +1186,12 @@ def test_shield_pause(
             "('cancelled_before_pause'",  # actor name
             _repl_fail_msg,
             "trio.Cancelled",
-            "raise Cancelled._create()",
+            # trio >=0.30 raises via a multi-line
+            # `raise Cancelled._create(source=.., reason=..,
+            #  source_task=..)` (cancel-reason metadata), so
+            # match the open-paren form only, NOT the legacy
+            # bare `()`.
+            "raise Cancelled._create(",
 
             # we should be handling a taskc inside
             # the first `.port_mortem()` sin-shield!
@@ -1204,7 +1209,12 @@ def test_shield_pause(
             "('root'",  # actor name
             _repl_fail_msg,
             "trio.Cancelled",
-            "raise Cancelled._create()",
+            # trio >=0.30 raises via a multi-line
+            # `raise Cancelled._create(source=.., reason=..,
+            #  source_task=..)` (cancel-reason metadata), so
+            # match the open-paren form only, NOT the legacy
+            # bare `()`.
+            "raise Cancelled._create(",
 
             # handling a taskc inside the first unshielded
             # `.port_mortem()`.