fix(cli/js/ops/fs_events): Ignore polling errors caused by return() (#6785)

1 files changed, 19 insertions, 1 deletions

diff --git a/cli/tests/unit/fs_events_test.ts b/cli/tests/unit/fs_events_test.ts
index f2dd59d79..d73001187 100644
--- a/cli/tests/unit/fs_events_test.ts
+++ b/cli/tests/unit/fs_events_test.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { unitTest, assert, assertThrows } from "./test_util.ts";
+import { unitTest, assert, assertEquals, assertThrows } from "./test_util.ts";
 
 // TODO(ry) Add more tests to specify format.
 
@@ -60,3 +60,21 @@ unitTest(
     assert(events[1].paths[0].includes(testDir));
   },
 );
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function watchFsReturn(): Promise<void> {
+    const testDir = await Deno.makeTempDir();
+    const iter = Deno.watchFs(testDir);
+
+    // Asynchronously loop events.
+    const eventsPromise = getTwoEvents(iter);
+
+    // Close the watcher.
+    await iter.return!();
+
+    // Expect zero events.
+    const events = await eventsPromise;
+    assertEquals(events, []);
+  },
+);