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denoland-deno/std/async/mux_async_iterator_test.ts
2020-06-15 12:03:07 -04:00

53 lines
1.3 KiB
TypeScript

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrowsAsync } from "../testing/asserts.ts";
import { MuxAsyncIterator } from "./mux_async_iterator.ts";
// eslint-disable-next-line require-await
async function* gen123(): AsyncIterableIterator<number> {
yield 1;
yield 2;
yield 3;
}
// eslint-disable-next-line require-await
async function* gen456(): AsyncIterableIterator<number> {
yield 4;
yield 5;
yield 6;
}
// eslint-disable-next-line require-await
async function* genThrows(): AsyncIterableIterator<number> {
yield 7;
throw new Error("something went wrong");
}
Deno.test("[async] MuxAsyncIterator", async function (): Promise<void> {
const mux = new MuxAsyncIterator<number>();
mux.add(gen123());
mux.add(gen456());
const results = new Set();
for await (const value of mux) {
results.add(value);
}
assertEquals(results.size, 6);
});
Deno.test({
name: "[async] MuxAsyncIterator throws",
async fn() {
const mux = new MuxAsyncIterator<number>();
mux.add(gen123());
mux.add(genThrows());
const results = new Set();
await assertThrowsAsync(
async () => {
for await (const value of mux) {
results.add(value);
}
},
Error,
"something went wrong"
);
},
});