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std/node/_fs/_fs_watch_test.ts

Deno standard library
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import { watch } from "./_fs_watch.ts";import { assertEquals, fail } from "../../testing/asserts.ts";
function wait(time: number) { return new Promise((resolve) => { setTimeout(resolve, time); });}
Deno.test({ name: "watching a file", async fn() { const file = Deno.makeTempFileSync(); const result: Array<[string, string]> = []; await new Promise((resolve) => { const watcher = watch( file, (eventType, filename) => result.push([eventType, filename]), ); wait(100) .then(() => Deno.writeTextFileSync(file, "something")) .then(() => wait(100)) .then(() => watcher.close()) .then(() => wait(100)) .then(resolve); }) .then(() => { assertEquals(result.length >= 1, true); }) .catch(() => fail()); },});