85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
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function assert(actual, expected, message) {
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if (arguments.length == 1)
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expected = true;
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if (actual === expected)
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return;
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if (actual !== null && expected !== null
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&& typeof actual == 'object' && typeof expected == 'object'
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&& actual.toString() === expected.toString())
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return;
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throw Error("assertion failed: got |" + actual + "|" +
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", expected |" + expected + "|" +
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(message ? " (" + message + ")" : ""));
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}
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function assert_throws(expected_error, func)
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{
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var err = false;
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try {
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func();
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} catch(e) {
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err = true;
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if (!(e instanceof expected_error)) {
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throw Error("unexpected exception type");
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}
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}
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if (!err) {
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throw Error("expected exception");
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}
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}
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function assert_array_equals(a, b) {
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if (!Array.isArray(a) || !Array.isArray(b))
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return assert(false);
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assert(a.length === b.length);
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a.forEach((value, idx) => {
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assert(b[idx] === value);
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});
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}
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// load more elaborate version of assert if available
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try { std.loadScript("test_assert.js"); } catch(e) {}
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function test_types() {
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assert_throws(TypeError, () => queueMicrotask(), "no argument");
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assert_throws(TypeError, () => queueMicrotask(undefined), "undefined");
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assert_throws(TypeError, () => queueMicrotask(null), "null");
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assert_throws(TypeError, () => queueMicrotask(0), "0");
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assert_throws(TypeError, () => queueMicrotask({ handleEvent() { } }), "an event handler object");
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assert_throws(TypeError, () => queueMicrotask("window.x = 5;"), "a string");
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}
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function test_async() {
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let called = false;
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queueMicrotask(() => {
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called = true;
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});
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assert(!called);
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}
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function test_arguments() {
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queueMicrotask(function () { // note: intentionally not an arrow function
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assert(arguments.length === 0);
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}, "x", "y");
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};
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function test_async_order() {
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const happenings = [];
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Promise.resolve().then(() => happenings.push("a"));
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queueMicrotask(() => happenings.push("b"));
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Promise.reject().catch(() => happenings.push("c"));
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queueMicrotask(() => {
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assert_array_equals(happenings, ["a", "b", "c"]);
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});
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}
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test_types();
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test_async();
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test_arguments();
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test_async_order();
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