--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-threadpool.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,76 @@
+/* Copyright Joyent, Inc. and other Node 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"
+
+static int work_cb_count;
+static int after_work_cb_count;
+static uv_work_t work_req;
+static char data;
+
+
+static void work_cb(uv_work_t* req) {
+  ASSERT_PTR_EQ(req, &work_req);
+  ASSERT_PTR_EQ(req->data, &data);
+  work_cb_count++;
+}
+
+
+static void after_work_cb(uv_work_t* req, int status) {
+  ASSERT_OK(status);
+  ASSERT_PTR_EQ(req, &work_req);
+  ASSERT_PTR_EQ(req->data, &data);
+  after_work_cb_count++;
+}
+
+
+TEST_IMPL(threadpool_queue_work_simple) {
+  int r;
+
+  work_req.data = &data;
+  r = uv_queue_work(uv_default_loop(), &work_req, work_cb, after_work_cb);
+  ASSERT_OK(r);
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, work_cb_count);
+  ASSERT_EQ(1, after_work_cb_count);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(threadpool_queue_work_einval) {
+  int r;
+
+  work_req.data = &data;
+  r = uv_queue_work(uv_default_loop(), &work_req, NULL, after_work_cb);
+  ASSERT_EQ(r, UV_EINVAL);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_OK(work_cb_count);
+  ASSERT_OK(after_work_cb_count);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}