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denoland-deno/cli/js/timers_test.ts
Kitson Kelly 9837d324a7 Update to TypeScript 3.7 (#3275)
and update to prettier 1.19

Also, update `assert()` and remove not null assertions where possibly
in `cli`.

Closes #3273
2019-11-13 13:42:34 -05:00

301 lines
7 KiB
TypeScript

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { test, assert, assertEquals, assertNotEquals } from "./test_util.ts";
function deferred(): {
promise: Promise<{}>;
resolve: (value?: {} | PromiseLike<{}>) => void;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
reject: (reason?: any) => void;
} {
let resolve;
let reject;
const promise = new Promise((res, rej): void => {
resolve = res;
reject = rej;
});
return {
promise,
resolve,
reject
};
}
async function waitForMs(ms): Promise<number> {
return new Promise((resolve): number => setTimeout(resolve, ms));
}
test(async function timeoutSuccess(): Promise<void> {
const { promise, resolve } = deferred();
let count = 0;
setTimeout((): void => {
count++;
resolve();
}, 500);
await promise;
// count should increment
assertEquals(count, 1);
});
test(async function timeoutArgs(): Promise<void> {
const { promise, resolve } = deferred();
const arg = 1;
setTimeout(
(a, b, c): void => {
assertEquals(a, arg);
assertEquals(b, arg.toString());
assertEquals(c, [arg]);
resolve();
},
10,
arg,
arg.toString(),
[arg]
);
await promise;
});
test(async function timeoutCancelSuccess(): Promise<void> {
let count = 0;
const id = setTimeout((): void => {
count++;
}, 1);
// Cancelled, count should not increment
clearTimeout(id);
await waitForMs(600);
assertEquals(count, 0);
});
test(async function timeoutCancelMultiple(): Promise<void> {
function uncalled(): never {
throw new Error("This function should not be called.");
}
// Set timers and cancel them in the same order.
const t1 = setTimeout(uncalled, 10);
const t2 = setTimeout(uncalled, 10);
const t3 = setTimeout(uncalled, 10);
clearTimeout(t1);
clearTimeout(t2);
clearTimeout(t3);
// Set timers and cancel them in reverse order.
const t4 = setTimeout(uncalled, 20);
const t5 = setTimeout(uncalled, 20);
const t6 = setTimeout(uncalled, 20);
clearTimeout(t6);
clearTimeout(t5);
clearTimeout(t4);
// Sleep until we're certain that the cancelled timers aren't gonna fire.
await waitForMs(50);
});
test(async function timeoutCancelInvalidSilentFail(): Promise<void> {
// Expect no panic
const { promise, resolve } = deferred();
let count = 0;
const id = setTimeout((): void => {
count++;
// Should have no effect
clearTimeout(id);
resolve();
}, 500);
await promise;
assertEquals(count, 1);
// Should silently fail (no panic)
clearTimeout(2147483647);
});
test(async function intervalSuccess(): Promise<void> {
const { promise, resolve } = deferred();
let count = 0;
const id = setInterval((): void => {
count++;
clearInterval(id);
resolve();
}, 100);
await promise;
// Clear interval
clearInterval(id);
// count should increment twice
assertEquals(count, 1);
});
test(async function intervalCancelSuccess(): Promise<void> {
let count = 0;
const id = setInterval((): void => {
count++;
}, 1);
clearInterval(id);
await waitForMs(500);
assertEquals(count, 0);
});
test(async function intervalOrdering(): Promise<void> {
const timers = [];
let timeouts = 0;
function onTimeout(): void {
++timeouts;
for (let i = 1; i < timers.length; i++) {
clearTimeout(timers[i]);
}
}
for (let i = 0; i < 10; i++) {
timers[i] = setTimeout(onTimeout, 1);
}
await waitForMs(500);
assertEquals(timeouts, 1);
});
test(async function intervalCancelInvalidSilentFail(): Promise<void> {
// Should silently fail (no panic)
clearInterval(2147483647);
});
test(async function fireCallbackImmediatelyWhenDelayOverMaxValue(): Promise<
void
> {
let count = 0;
setTimeout((): void => {
count++;
}, 2 ** 31);
await waitForMs(1);
assertEquals(count, 1);
});
test(async function timeoutCallbackThis(): Promise<void> {
const { promise, resolve } = deferred();
const obj = {
foo(): void {
assertEquals(this, window);
resolve();
}
};
setTimeout(obj.foo, 1);
await promise;
});
test(async function timeoutBindThis(): Promise<void> {
function noop(): void {}
const thisCheckPassed = [null, undefined, window, globalThis];
const thisCheckFailed = [
0,
"",
true,
false,
{},
[],
"foo",
(): void => {},
Object.prototype
];
thisCheckPassed.forEach(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(thisArg: any): void => {
let hasThrown = 0;
try {
setTimeout.call(thisArg, noop, 1);
hasThrown = 1;
} catch (err) {
if (err instanceof TypeError) {
hasThrown = 2;
} else {
hasThrown = 3;
}
}
assertEquals(hasThrown, 1);
}
);
thisCheckFailed.forEach(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(thisArg: any): void => {
let hasThrown = 0;
try {
setTimeout.call(thisArg, noop, 1);
hasThrown = 1;
} catch (err) {
if (err instanceof TypeError) {
hasThrown = 2;
} else {
hasThrown = 3;
}
}
assertEquals(hasThrown, 2);
}
);
});
test(async function clearTimeoutShouldConvertToNumber(): Promise<void> {
let called = false;
const obj = {
valueOf(): number {
called = true;
return 1;
}
};
clearTimeout((obj as unknown) as number);
assert(called);
});
test(function setTimeoutShouldThrowWithBigint(): void {
let hasThrown = 0;
try {
setTimeout((): void => {}, (1n as unknown) as number);
hasThrown = 1;
} catch (err) {
if (err instanceof TypeError) {
hasThrown = 2;
} else {
hasThrown = 3;
}
}
assertEquals(hasThrown, 2);
});
test(function clearTimeoutShouldThrowWithBigint(): void {
let hasThrown = 0;
try {
clearTimeout((1n as unknown) as number);
hasThrown = 1;
} catch (err) {
if (err instanceof TypeError) {
hasThrown = 2;
} else {
hasThrown = 3;
}
}
assertEquals(hasThrown, 2);
});
test(function testFunctionName(): void {
assertEquals(clearTimeout.name, "clearTimeout");
assertEquals(clearInterval.name, "clearInterval");
});
test(function testFunctionParamsLength(): void {
assertEquals(setTimeout.length, 1);
assertEquals(setInterval.length, 1);
assertEquals(clearTimeout.length, 0);
assertEquals(clearInterval.length, 0);
});
test(function clearTimeoutAndClearIntervalNotBeEquals(): void {
assertNotEquals(clearTimeout, clearInterval);
});
test(async function timerMaxCpuBug(): Promise<void> {
// There was a bug where clearing a timeout would cause Deno to use 100% CPU.
clearTimeout(setTimeout(() => {}, 1000));
// We can check this by counting how many ops have triggered in the interim.
// Certainly less than 10 ops should have been dispatched in next 100 ms.
const { opsDispatched } = Deno.metrics();
await waitForMs(100);
const opsDispatched_ = Deno.metrics().opsDispatched;
console.log("opsDispatched", opsDispatched, "opsDispatched_", opsDispatched_);
assert(opsDispatched_ - opsDispatched < 10);
});