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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assert, fail } from "../../../test_util/std/testing/asserts.ts";
import { fromFileUrl, relative } from "../../../test_util/std/path/mod.ts";
import { pipeline } from "node:stream/promises";
import { Writable } from "node:stream";
import { createReadStream, createWriteStream } from "node:fs";
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
}
});
// TODO(kt3k): Remove this test case when the node compat test suite is
// updated to version 18.16.0 or above.
// The last case in parallel/test-stream2-transform.js covers this case.
// See https://github.com/nodejs/node/pull/46818
Deno.test("stream.Writable does not change the order of items", async () => {
async function test() {
const chunks: Uint8Array[] = [];
const writable = new Writable({
construct(cb) {
setTimeout(cb, 10);
},
write(chunk, _, cb) {
chunks.push(chunk);
cb();
},
});
for (const i of Array(20).keys()) {
writable.write(Uint8Array.from([i]));
await new Promise((resolve) => setTimeout(resolve, 1));
}
if (chunks[0][0] !== 0) {
// The first chunk is swapped with the later chunk.
fail("The first chunk is swapped");
}
}
for (const _ of Array(10)) {
// Run it multiple times to avoid flaky false negative.
await test();
}
});
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