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callbacks_test.ts
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callbacks_test.ts
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import { assertEquals, delay } from "./deps.ts";
import {
resolvesNext,
returnsArg,
returnsArgs,
returnsNext,
returnsThis,
} from "./callbacks.ts";
Deno.test("returnsThis", () => {
const callback = returnsThis();
const obj = { callback, x: 1, y: 2 };
const obj2 = { x: 2, y: 3 };
assertEquals(callback(), undefined);
assertEquals(obj.callback(), obj);
assertEquals(callback.apply(obj2, []), obj2);
});
Deno.test("returnsArg", () => {
let callback = returnsArg(0);
assertEquals(callback(), undefined);
assertEquals(callback("a"), "a");
assertEquals(callback("b", "c"), "b");
callback = returnsArg(1);
assertEquals(callback(), undefined);
assertEquals(callback("a"), undefined);
assertEquals(callback("b", "c"), "c");
assertEquals(callback("d", "e", "f"), "e");
});
Deno.test("returnsArgs", () => {
let callback = returnsArgs();
assertEquals(callback(), []);
assertEquals(callback("a"), ["a"]);
assertEquals(callback("b", "c"), ["b", "c"]);
callback = returnsArgs(1);
assertEquals(callback(), []);
assertEquals(callback("a"), []);
assertEquals(callback("b", "c"), ["c"]);
assertEquals(callback("d", "e", "f"), ["e", "f"]);
callback = returnsArgs(1, 3);
assertEquals(callback("a"), []);
assertEquals(callback("b", "c"), ["c"]);
assertEquals(callback("d", "e", "f"), ["e", "f"]);
assertEquals(callback("d", "e", "f", "g"), ["e", "f"]);
});
Deno.test("returnsNext with array", () => {
let results: number[] = [1, 2, 3];
let callback = returnsNext(results);
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
assertEquals(callback(), undefined);
results = [];
callback = returnsNext(results);
results.push(1, 2, 3);
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
results.push(4);
assertEquals(callback(), 4);
assertEquals(callback(), undefined);
results.push(5);
assertEquals(callback(), undefined);
});
Deno.test("returnsNext with iterator", () => {
let results: number[] = [1, 2, 3];
let callback = returnsNext(results.values());
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
assertEquals(callback(), undefined);
results = [];
callback = returnsNext(results.values());
results.push(1, 2, 3);
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
results.push(4);
assertEquals(callback(), 4);
assertEquals(callback(), undefined);
results.push(5);
assertEquals(callback(), undefined);
});
Deno.test("returnsNext with generator", () => {
let results: number[] = [1, 2, 3];
const generator = function* () {
yield* results;
};
let callback = returnsNext(generator());
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
assertEquals(callback(), undefined);
results = [];
callback = returnsNext(generator());
results.push(1, 2, 3);
assertEquals(callback(), 1);
assertEquals(callback(), 2);
assertEquals(callback(), 3);
results.push(4);
assertEquals(callback(), 4);
assertEquals(callback(), undefined);
results.push(5);
assertEquals(callback(), undefined);
});
Deno.test("resolvesNext with array", async () => {
let results: number[] = [1, 2, 3];
let callback = resolvesNext(results);
const value = callback();
assertEquals(Promise.resolve(value), value);
assertEquals(await value, 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
assertEquals(await callback(), undefined);
results = [];
callback = resolvesNext(results);
results.push(1, 2, 3);
assertEquals(await callback(), 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
results.push(4);
assertEquals(await callback(), 4);
assertEquals(await callback(), undefined);
results.push(5);
assertEquals(await callback(), undefined);
});
Deno.test("resolvesNext with iterator", async () => {
let results: number[] = [1, 2, 3];
let callback = resolvesNext(results.values());
const value = callback();
assertEquals(Promise.resolve(value), value);
assertEquals(await value, 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
assertEquals(await callback(), undefined);
results = [];
callback = resolvesNext(results.values());
results.push(1, 2, 3);
assertEquals(await callback(), 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
results.push(4);
assertEquals(await callback(), 4);
assertEquals(await callback(), undefined);
results.push(5);
assertEquals(await callback(), undefined);
});
Deno.test("resolvesNext with async generator", async () => {
let results: number[] = [1, 2, 3];
const asyncGenerator = async function* () {
await delay(0);
yield* results;
};
let callback = resolvesNext(asyncGenerator());
const value = callback();
assertEquals(Promise.resolve(value), value);
assertEquals(await value, 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
assertEquals(await callback(), undefined);
results = [];
callback = resolvesNext(asyncGenerator());
results.push(1, 2, 3);
assertEquals(await callback(), 1);
assertEquals(await callback(), 2);
assertEquals(await callback(), 3);
results.push(4);
assertEquals(await callback(), 4);
assertEquals(await callback(), undefined);
results.push(5);
assertEquals(await callback(), undefined);
});