1 files changed, 52 insertions, 0 deletions
diff --git a/cli/js/fs_events_test.ts b/cli/js/fs_events_test.ts
new file mode 100644
index 000000000..161ee2ebf
--- /dev/null
+++ b/cli/js/fs_events_test.ts
@@ -0,0 +1,52 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { testPerm, assert } from "./test_util.ts";
+
+// TODO(ry) Add more tests to specify format.
+
+testPerm({ read: false }, function fsEventsPermissions() {
+  let thrown = false;
+  try {
+    Deno.fsEvents(".");
+  } catch (err) {
+    assert(err instanceof Deno.Err.PermissionDenied);
+    thrown = true;
+  }
+  assert(thrown);
+});
+
+async function getTwoEvents(
+  iter: AsyncIterableIterator<Deno.FsEvent>
+): Promise<Deno.FsEvent[]> {
+  const events = [];
+  for await (const event of iter) {
+    console.log(">>>> event", event);
+    events.push(event);
+    if (events.length > 2) break;
+  }
+  return events;
+}
+
+testPerm({ read: true, write: true }, async function fsEventsBasic(): Promise<
+  void
+> {
+  const testDir = await Deno.makeTempDir();
+  const iter = Deno.fsEvents(testDir);
+
+  // Asynchornously capture two fs events.
+  const eventsPromise = getTwoEvents(iter);
+
+  // Make some random file system activity.
+  const file1 = testDir + "/file1.txt";
+  const file2 = testDir + "/file2.txt";
+  Deno.writeFileSync(file1, new Uint8Array([0, 1, 2]));
+  Deno.writeFileSync(file2, new Uint8Array([0, 1, 2]));
+
+  // We should have gotten two fs events.
+  const events = await eventsPromise;
+  console.log("events", events);
+  assert(events.length >= 2);
+  assert(events[0].kind == "create");
+  assert(events[0].paths[0].includes(testDir));
+  assert(events[1].kind == "create" || events[1].kind == "modify");
+  assert(events[1].paths[0].includes(testDir));
+});