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merge.test.ts
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merge.test.ts
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// deno-lint-ignore-file no-explicit-any
import { chan, merge } from "./csp.ts";
import { assertEquals } from "https://deno.land/std@0.176.0/testing/asserts.ts";
Deno.test("close merged channel", async () => {
const c1 = chan<void>();
const c2 = chan<void>();
let failed = false;
(async () => {
await c1.put();
failed = true;
})();
(async () => {
await c2.put();
failed = true; // if successfully reach this line, fail the test
})();
const merged = merge<void>(c1, c2);
await merged.close();
assertEquals(failed, false);
});
Deno.test("consume 2 elements from 3 sources", async () => {
const c1 = chan<string>();
const c2 = chan<string>();
const c3 = chan<string>();
let failed = false;
(async () => {
await c1.put("1a");
})();
(async () => {
await c2.put("2a");
})();
(async () => {
let res = await c3.put("3a");
assertEquals(await c3.pop(), "3a"); // element is put back by merge because it was closed.
})();
const merged = merge<string>(c1, c2, c3);
assertEquals(await merged.pop(), "1a");
assertEquals(await merged.pop(), "2a");
await merged.close();
});