1 files changed, 39 insertions, 0 deletions
diff --git a/test/fixtures/wpt/html/webappapis/microtask-queuing/queue-microtask.any.js b/test/fixtures/wpt/html/webappapis/microtask-queuing/queue-microtask.any.js
new file mode 100644
index 0000000000..b39931719a
--- /dev/null
+++ b/test/fixtures/wpt/html/webappapis/microtask-queuing/queue-microtask.any.js
@@ -0,0 +1,39 @@
+// META: global=window,worker
+"use strict";
+
+test(() => {
+  assert_equals(typeof queueMicrotask, "function");
+}, "It exists and is a function");
+
+test(() => {
+  assert_throws(new TypeError(), () => queueMicrotask(), "no argument");
+  assert_throws(new TypeError(), () => queueMicrotask(undefined), "undefined");
+  assert_throws(new TypeError(), () => queueMicrotask(null), "null");
+  assert_throws(new TypeError(), () => queueMicrotask(0), "0");
+  assert_throws(new TypeError(), () => queueMicrotask({ handleEvent() { } }), "an event handler object");
+  assert_throws(new TypeError(), () => queueMicrotask("window.x = 5;"), "a string");
+}, "It throws when given non-functions");
+
+async_test(t => {
+  let called = false;
+  queueMicrotask(t.step_func_done(() => {
+    called = true;
+  }));
+  assert_false(called);
+}, "It calls the callback asynchronously");
+
+async_test(t => {
+  queueMicrotask(t.step_func_done(function () { // note: intentionally not an arrow function
+    assert_array_equals(arguments, []);
+  }), "x", "y");
+}, "It does not pass any arguments");
+
+async_test(t => {
+  const happenings = [];
+  Promise.resolve().then(() => happenings.push("a"));
+  queueMicrotask(() => happenings.push("b"));
+  Promise.reject().catch(() => happenings.push("c"));
+  queueMicrotask(t.step_func_done(() => {
+    assert_array_equals(happenings, ["a", "b", "c"]);
+  }));
+}, "It interleaves with promises as expected");