test: delete test with invalid assumption (#4530)

Delete the fs_event_error_reporting test. It fails in different ways,
most frequently on the TSan sanitizer buildbot, due to running out of
file descriptors when that is not expected, or vice versa, *not*
running out of file descriptors when that *is* expected.

The test creates a large number of event loops and expects to,
eventually, hit EMFILE but it sometimes hits it too early, and
sometimes not at all.

I don't think TSan is really responsible here, it just makes the
invalid assumption in the test itself more visible.

Fixes: https://github.com/libuv/libuv/issues/4368

test/test-fs-event.c

@@ -1145,106 +1145,6 @@ TEST_IMPL(fs_event_getpath) {
   return 0;
 }
 
-#if defined(__APPLE__)
-
-static int fs_event_error_reported;
-
-static void fs_event_error_report_cb(uv_fs_event_t* handle,
-                                     const char* filename,
-                                     int events,
-                                     int status) {
-  if (status != 0)
-    fs_event_error_reported = status;
-}
-
-static void timer_cb_nop(uv_timer_t* handle) {
-  ++timer_cb_called;
-  uv_close((uv_handle_t*) handle, close_cb);
-}
-
-static void fs_event_error_report_close_cb(uv_handle_t* handle) {
-  ASSERT_NOT_NULL(handle);
-  close_cb_called++;
-
-  /* handle is allocated on-stack, no need to free it */
-}
-
-
-TEST_IMPL(fs_event_error_reporting) {
-  unsigned int i;
-  uv_loop_t loops[1024];
-  uv_fs_event_t events[ARRAY_SIZE(loops)];
-  uv_loop_t* loop;
-  uv_fs_event_t* event;
-
-  TEST_FILE_LIMIT(ARRAY_SIZE(loops) * 3);
-
-  delete_dir("watch_dir/");
-  create_dir("watch_dir");
-
-  /* Create a lot of loops, and start FSEventStream in each of them.
-   * Eventually, this should create enough streams to make FSEventStreamStart()
-   * fail.
-   */
-  for (i = 0; i < ARRAY_SIZE(loops); i++) {
-    loop = &loops[i];
-    ASSERT_OK(uv_loop_init(loop));
-    event = &events[i];
-
-    timer_cb_called = 0;
-    close_cb_called = 0;
-    ASSERT_OK(uv_fs_event_init(loop, event));
-    ASSERT_OK(uv_fs_event_start(event,
-                                fs_event_error_report_cb,
-                                "watch_dir",
-                                0));
-    uv_unref((uv_handle_t*) event);
-
-    /* Let loop run for some time */
-    ASSERT_OK(uv_timer_init(loop, &timer));
-    ASSERT_OK(uv_timer_start(&timer, timer_cb_nop, 2, 0));
-    uv_run(loop, UV_RUN_DEFAULT);
-    ASSERT_EQ(1, timer_cb_called);
-    ASSERT_EQ(1, close_cb_called);
-    if (fs_event_error_reported != 0)
-      break;
-  }
-
-  /* At least one loop should fail */
-  ASSERT_EQ(fs_event_error_reported, UV_EMFILE);
-
-  /* Stop and close all events, and destroy loops */
-  do {
-    loop = &loops[i];
-    event = &events[i];
-
-    ASSERT_OK(uv_fs_event_stop(event));
-    uv_ref((uv_handle_t*) event);
-    uv_close((uv_handle_t*) event, fs_event_error_report_close_cb);
-
-    close_cb_called = 0;
-    uv_run(loop, UV_RUN_DEFAULT);
-    ASSERT_EQ(1, close_cb_called);
-
-    uv_loop_close(loop);
-  } while (i-- != 0);
-
-  delete_dir("watch_dir/");
-  MAKE_VALGRIND_HAPPY(uv_default_loop());
-  return 0;
-}
-
-#else  /* !defined(__APPLE__) */
-
-TEST_IMPL(fs_event_error_reporting) {
-  /* No-op, needed only for FSEvents backend */
-
-  MAKE_VALGRIND_HAPPY(uv_default_loop());
-  return 0;
-}
-
-#endif  /* defined(__APPLE__) */
-
 TEST_IMPL(fs_event_watch_invalid_path) {
 #if defined(NO_FS_EVENTS)
   RETURN_SKIP(NO_FS_EVENTS);

test/test-list.h

@@ -417,7 +417,6 @@ TEST_DECLARE   (fs_event_close_with_pending_event)
 TEST_DECLARE   (fs_event_close_with_pending_delete_event)
 TEST_DECLARE   (fs_event_close_in_callback)
 TEST_DECLARE   (fs_event_start_and_close)
-TEST_DECLARE   (fs_event_error_reporting)
 TEST_DECLARE   (fs_event_getpath)
 TEST_DECLARE   (fs_event_stop_in_cb)
 TEST_DECLARE   (fs_scandir_empty_dir)
@@ -1128,7 +1127,6 @@ TASK_LIST_START
   TEST_ENTRY  (fs_event_close_with_pending_delete_event)
   TEST_ENTRY  (fs_event_close_in_callback)
   TEST_ENTRY  (fs_event_start_and_close)
-  TEST_ENTRY_CUSTOM (fs_event_error_reporting, 0, 0, 60000)
   TEST_ENTRY  (fs_event_getpath)
   TEST_ENTRY  (fs_event_stop_in_cb)
   TEST_ENTRY  (fs_scandir_empty_dir)