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denoland-deno/tests/unit_node/timers_test.ts

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assert, fail } from "@std/assert";
import * as timers from "node:timers";
import * as timersPromises from "node:timers/promises";
import { assertEquals } from "@std/assert";
Deno.test("[node/timers setTimeout]", () => {
{
const { clearTimeout, setTimeout } = timers;
const id = setTimeout(() => {});
clearTimeout(id);
}
{
const id = timers.setTimeout(() => {});
timers.clearTimeout(id);
}
});
Deno.test("[node/timers setInterval]", () => {
{
const { clearInterval, setInterval } = timers;
const id = setInterval(() => {});
clearInterval(id);
}
{
const id = timers.setInterval(() => {});
timers.clearInterval(id);
}
});
Deno.test("[node/timers setImmediate]", async () => {
{
const { clearImmediate, setImmediate } = timers;
const imm = setImmediate(() => {});
clearImmediate(imm);
}
{
const imm = timers.setImmediate(() => {});
timers.clearImmediate(imm);
}
{
const deffered = Promise.withResolvers<void>();
const imm = timers.setImmediate(
(a, b) => {
assert(a === 1);
assert(b === 2);
deffered.resolve();
},
1,
2,
);
await deffered;
timers.clearImmediate(imm);
}
});
Deno.test("[node/timers/promises setTimeout]", () => {
const { setTimeout } = timersPromises;
const p = setTimeout(0);
assert(p instanceof Promise);
return p;
});
Deno.test("[node/timers/promises scheduler.wait]", async () => {
const { scheduler } = timersPromises;
let resolved = false;
timers.setTimeout(() => (resolved = true), 20);
const p = scheduler.wait(20);
assert(p instanceof Promise);
await p;
assert(resolved);
});
Deno.test("[node/timers/promises scheduler.yield]", async () => {
const { scheduler } = timersPromises;
let resolved = false;
timers.setImmediate(() => resolved = true);
const p = scheduler.yield();
assert(p instanceof Promise);
await p;
assert(resolved);
});
// Regression test for https://github.com/denoland/deno/issues/17981
Deno.test("[node/timers refresh cancelled timer]", () => {
const { setTimeout, clearTimeout } = timers;
const p = setTimeout(() => {
fail();
}, 1);
clearTimeout(p);
p.refresh();
});
Deno.test("[node/timers setImmediate returns Immediate object]", () => {
const { clearImmediate, setImmediate } = timers;
const imm = setImmediate(() => {});
imm.unref();
imm.ref();
imm.hasRef();
clearImmediate(imm);
});
Deno.test({
name: "setInterval yields correct values at expected intervals",
async fn() {
// Test configuration
const CONFIG = {
expectedValue: 42,
intervalMs: 100,
iterations: 3,
tolerancePercent: Deno.env.get("CI") != null ? 75 : 50,
};
const { setInterval } = timersPromises;
const results: Array<{ value: number; timestamp: number }> = [];
const startTime = Date.now();
const iterator = setInterval(CONFIG.intervalMs, CONFIG.expectedValue);
for await (const value of iterator) {
results.push({
value,
timestamp: Date.now(),
});
if (results.length === CONFIG.iterations) {
break;
}
}
const values = results.map((r) => r.value);
assertEquals(
values,
Array(CONFIG.iterations).fill(CONFIG.expectedValue),
`Each iteration should yield ${CONFIG.expectedValue}`,
);
const intervals = results.slice(1).map((result, index) => ({
interval: result.timestamp - results[index].timestamp,
iterationNumber: index + 1,
}));
const toleranceMs = (CONFIG.tolerancePercent / 100) * CONFIG.intervalMs;
const expectedRange = {
min: CONFIG.intervalMs - toleranceMs,
max: CONFIG.intervalMs + toleranceMs,
};
intervals.forEach(({ interval, iterationNumber }) => {
const isWithinTolerance = interval >= expectedRange.min &&
interval <= expectedRange.max;
assertEquals(
isWithinTolerance,
true,
`Iteration ${iterationNumber}: Interval ${interval}ms should be within ` +
`${expectedRange.min}ms and ${expectedRange.max}ms ` +
`(${CONFIG.tolerancePercent}% tolerance of ${CONFIG.intervalMs}ms)`,
);
});
const totalDuration = results[results.length - 1].timestamp - startTime;
const expectedDuration = CONFIG.intervalMs * CONFIG.iterations;
const isDurationReasonable =
totalDuration >= (expectedDuration - toleranceMs) &&
totalDuration <= (expectedDuration + toleranceMs);
assertEquals(
isDurationReasonable,
true,
`Total duration ${totalDuration}ms should be close to ${expectedDuration}ms ` +
`(within ${toleranceMs}ms tolerance)`,
);
const timestamps = results.map((r) => r.timestamp);
const areTimestampsOrdered = timestamps.every((timestamp, i) =>
i === 0 || timestamp > timestamps[i - 1]
);
assertEquals(
areTimestampsOrdered,
true,
"Timestamps should be strictly increasing",
);
},
});
Deno.test({
name: "setInterval with AbortSignal stops after expected duration",
async fn() {
const INTERVAL_MS = 500;
const TOTAL_DURATION_MS = 3000;
const TOLERANCE_MS = 500;
const DELTA_TOLERANCE_MS = Deno.env.get("CI") != null ? 100 : 50;
const abortController = new AbortController();
const { setInterval } = timersPromises;
// Set up abort after specified duration
const abortTimeout = timers.setTimeout(() => {
abortController.abort();
}, TOTAL_DURATION_MS);
// Track iterations and timing
const startTime = Date.now();
const iterations: number[] = [];
try {
for await (
const _timestamp of setInterval(INTERVAL_MS, undefined, {
signal: abortController.signal,
})
) {
iterations.push(Date.now() - startTime);
}
} catch (error) {
if (error instanceof Error && error.name !== "AbortError") {
throw error;
}
} finally {
timers.clearTimeout(abortTimeout);
}
// Validate timing
const totalDuration = iterations[iterations.length - 1];
const isWithinTolerance =
totalDuration >= (TOTAL_DURATION_MS - TOLERANCE_MS) &&
totalDuration <= (TOTAL_DURATION_MS + TOLERANCE_MS);
assertEquals(
isWithinTolerance,
true,
`Total duration ${totalDuration}ms should be within ±${TOLERANCE_MS}ms of ${TOTAL_DURATION_MS}ms`,
);
// Validate interval consistency
const intervalDeltas = iterations.slice(1).map((time, i) =>
time - iterations[i]
);
intervalDeltas.forEach((delta, i) => {
const isIntervalValid = delta >= (INTERVAL_MS - DELTA_TOLERANCE_MS) &&
delta <= (INTERVAL_MS + DELTA_TOLERANCE_MS);
assertEquals(
isIntervalValid,
true,
`Interval ${
i + 1
} duration (${delta}ms) should be within ±${DELTA_TOLERANCE_MS}ms of ${INTERVAL_MS}ms`,
);
});
},
});