Open the errlog capture as UTF-8 in the noisy-child test

maxisbey · maxisbey · commit 3e5fa689f9c6 · 2026-07-21T21:32:55.000Z
Matches the sibling errlog tests; the platform locale default could
mojibake a failing child's stderr diagnostics on Windows.

No-Verification-Needed: test-only encoding fix
diff --git a/tests/transports/stdio/test_lifecycle.py b/tests/transports/stdio/test_lifecycle.py
@@ -303,7 +303,7 @@ def run_noisy_child() -> str:
         """
     )
 
-    with (tmp_path / "server-stderr.txt").open("w+") as errlog:
+    with (tmp_path / "server-stderr.txt").open("w+", encoding="utf-8") as errlog:
         transport = stdio_client(StdioServerParameters(command=sys.executable, args=["-c", server]), errlog=errlog)
         # Bound covers three interpreter cold starts; a regressed Windows leg hangs rather than corrupts.
         with anyio.fail_after(40):

Original file line number	Diff line number	Diff line change
`@@ -303,7 +303,7 @@ def run_noisy_child() -> str:`
`303`	`303`	`"""`
`304`	`304`	`)`
`305`	`305`
`306`		`- with (tmp_path / "server-stderr.txt").open("w+") as errlog:`
	`306`	`+ with (tmp_path / "server-stderr.txt").open("w+", encoding="utf-8") as errlog:`
`307`	`307`	`transport = stdio_client(StdioServerParameters(command=sys.executable, args=["-c", server]), errlog=errlog)`
`308`	`308`	`# Bound covers three interpreter cold starts; a regressed Windows leg hangs rather than corrupts.`
`309`	`309`	`with anyio.fail_after(40):`