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denoland-deno/tests/unit_node/stream_test.ts

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