| // META: global=window,worker |
| "use strict"; |
| |
| test(() => { |
| assert_equals(typeof queueMicrotask, "function"); |
| }, "It exists and is a function"); |
| |
| test(() => { |
| assert_throws_js(TypeError, () => queueMicrotask(), "no argument"); |
| assert_throws_js(TypeError, () => queueMicrotask(undefined), "undefined"); |
| assert_throws_js(TypeError, () => queueMicrotask(null), "null"); |
| assert_throws_js(TypeError, () => queueMicrotask(0), "0"); |
| assert_throws_js(TypeError, () => queueMicrotask({ handleEvent() { } }), "an event handler object"); |
| assert_throws_js(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"); |