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debounce_test.ts
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debounce_test.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertStrictEquals } from "../testing/asserts.ts";
import { debounce, DebouncedFunction } from "./debounce.ts";
import { delay } from "./delay.ts";
Deno.test("[async] debounce: called", async function () {
let called = 0;
const d = debounce(() => called++, 100);
d();
d();
d();
assertEquals(called, 0);
assertEquals(d.pending, true);
await delay(200);
assertEquals(called, 1);
assertEquals(d.pending, false);
});
Deno.test("[async] debounce: canceled", async function () {
let called = 0;
const d = debounce(() => called++, 100);
d();
d();
d();
assertEquals(called, 0);
assertEquals(d.pending, true);
d.clear();
await delay(200);
assertEquals(called, 0);
assertEquals(d.pending, false);
});
Deno.test("[async] debounce: flushed", function () {
let called = 0;
const d = debounce(() => called++, 100);
d();
d();
d();
assertEquals(called, 0);
assertEquals(d.pending, true);
d.flush();
assertEquals(called, 1);
assertEquals(d.pending, false);
});
Deno.test("[async] debounce: with params & context", async function () {
const params: Array<string | number> = [];
const d = debounce(function (param1: string, param2: number) {
assertEquals(d.pending, false);
params.push(param1);
params.push(param2);
assertStrictEquals(d, this);
}, 100);
// @ts-expect-error Argument of type 'number' is not assignable to parameter of type 'string'.
d(1, 1);
d("foo", 1);
d("bar", 1);
d("baz", 1);
assertEquals(params.length, 0);
assertEquals(d.pending, true);
await delay(200);
assertEquals(params, ["baz", 1]);
assertEquals(d.pending, false);
});
Deno.test("[async] debounce: with types", async function () {
const params: Array<string> = [];
const fn = (param: string) => params.push(param);
const d: DebouncedFunction<[string]> = debounce(fn, 100);
// @ts-expect-error Argument of type 'number' is not assignable to parameter of type 'string'.
d(1);
d("foo");
assertEquals(params.length, 0);
assertEquals(d.pending, true);
await delay(200);
assertEquals(params, ["foo"]);
assertEquals(d.pending, false);
});