--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-loop-time.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,69 @@
+/* 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"
+
+
+TEST_IMPL(loop_update_time) {
+  uint64_t start;
+
+  start = uv_now(uv_default_loop());
+  while (uv_now(uv_default_loop()) - start < 1000)
+    ASSERT_OK(uv_run(uv_default_loop(), UV_RUN_NOWAIT));
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+static void cb(uv_timer_t* timer) {
+  uv_close((uv_handle_t*)timer, NULL);
+}
+
+TEST_IMPL(loop_backend_timeout) {
+  uv_loop_t *loop = uv_default_loop();
+  uv_timer_t timer;
+  int r;
+
+  /* The default loop has some internal watchers to initialize. */
+  loop->active_handles++;
+  r = uv_run(loop, UV_RUN_NOWAIT);
+  ASSERT_EQ(1, r);
+  loop->active_handles--;
+  ASSERT_OK(uv_loop_alive(loop));
+
+  r = uv_timer_init(loop, &timer);
+  ASSERT_OK(r);
+
+  ASSERT_OK(uv_loop_alive(loop));
+  ASSERT_OK(uv_backend_timeout(loop));
+
+  r = uv_timer_start(&timer, cb, 1000, 0); /* 1 sec */
+  ASSERT_OK(r);
+  ASSERT_EQ(1000, uv_backend_timeout(loop));
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+  ASSERT_OK(uv_backend_timeout(loop));
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}