--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-strscpy.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,53 @@
+/* Copyright libuv project contributors. All rights reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to
+* deal in the Software without restriction, including without limitation the
+* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+* sell copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+* IN THE SOFTWARE.
+*/
+
+#include "uv.h"
+#include "task.h"
+#include <string.h>
+
+#include "../src/strscpy.h"
+#include "../src/strscpy.c"
+
+TEST_IMPL(strscpy) {
+  char d[4];
+
+  ASSERT_OK(uv__strscpy(d, "", 0));
+  ASSERT_OK(uv__strscpy(d, "x", 0));
+
+  memset(d, 0, sizeof(d));
+  ASSERT_EQ(1, uv__strscpy(d, "x", sizeof(d)));
+  ASSERT_OK(memcmp(d, "x\0\0", sizeof(d)));
+
+  memset(d, 0, sizeof(d));
+  ASSERT_EQ(2, uv__strscpy(d, "xy", sizeof(d)));
+  ASSERT_OK(memcmp(d, "xy\0", sizeof(d)));
+
+  ASSERT_EQ(3, uv__strscpy(d, "xyz", sizeof(d)));
+  ASSERT_OK(memcmp(d, "xyz", sizeof(d)));
+
+  ASSERT_EQ(UV_E2BIG, uv__strscpy(d, "xyzz", sizeof(d)));
+  ASSERT_OK(memcmp(d, "xyz", sizeof(d)));
+
+  ASSERT_EQ(UV_E2BIG, uv__strscpy(d, "xyzzy", sizeof(d)));
+  ASSERT_OK(memcmp(d, "xyz", sizeof(d)));
+
+  return 0;
+}