denoland-deno/std/signal/test.ts

const { test } = Deno;
import { assertEquals, assertThrows } from "../testing/asserts.ts";
import { delay } from "../util/async.ts";
import { signal } from "./mod.ts";

if (Deno.build.os !== "win") {
  test("signal() throws when called with empty signals", (): void => {
    assertThrows(
      () => {
        // @ts-ignore
        signal();
      },
      Error,
      "No signals are given. You need to specify at least one signal to create a signal stream."
    );
  });

  test("signal() iterates for multiple signals", async (): Promise<void> => {
    // This prevents the program from exiting.
    const t = setInterval(() => {}, 1000);

    let c = 0;
    const sig = signal(
      Deno.Signal.SIGUSR1,
      Deno.Signal.SIGUSR2,
      Deno.Signal.SIGINT
    );

    setTimeout(async () => {
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGINT);
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGUSR2);
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGUSR1);
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGUSR2);
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGUSR1);
      await delay(20);
      Deno.kill(Deno.pid, Deno.Signal.SIGINT);
      await delay(20);
      sig.dispose();
    });

    for await (const _ of sig) {
      c += 1;
    }

    assertEquals(c, 6);

    clearTimeout(t);
  });
}