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37 lines
1.2 KiB
TypeScript
37 lines
1.2 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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import { assert, assertEquals } from "@std/assert";
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import { fromFileUrl, relative } from "@std/path";
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import { pipeline } from "node:stream/promises";
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import { getDefaultHighWaterMark, Stream } from "node:stream";
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import { createReadStream, createWriteStream } from "node:fs";
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import { EventEmitter } from "node:events";
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Deno.test("stream/promises pipeline", async () => {
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const filePath = relative(
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Deno.cwd(),
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fromFileUrl(new URL("./testdata/lorem_ipsum.txt", import.meta.url)),
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);
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const input = createReadStream(filePath);
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const output = createWriteStream("lorem_ipsum.txt.copy");
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await pipeline(input, output);
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const content = Deno.readTextFileSync("lorem_ipsum.txt.copy");
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assert(content.startsWith("Lorem ipsum dolor sit amet"));
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try {
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Deno.removeSync("lorem_ipsum.txt.copy");
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} catch {
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// pass
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}
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});
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Deno.test("stream getDefaultHighWaterMark", () => {
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assertEquals(getDefaultHighWaterMark(false), 16 * 1024);
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assertEquals(getDefaultHighWaterMark(true), 16);
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});
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Deno.test("stream is an instance of EventEmitter", () => {
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const stream = new Stream();
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assert(stream instanceof EventEmitter);
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});
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