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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { write, writeSync } from "node:fs";
import { assertEquals } from "@std/assert";
import { Buffer } from "node:buffer";
const decoder = new TextDecoder("utf-8");
Deno.test({
name: "Data is written to the file with the correct length",
async fn() {
const tempFile: string = await Deno.makeTempFile();
using file = await Deno.open(tempFile, {
create: true,
write: true,
read: true,
});
const buffer = Buffer.from("hello world");
const bytesWrite = await new Promise((resolve, reject) => {
write(file.rid, buffer, 0, 5, (err: unknown, nwritten: number) => {
if (err) return reject(err);
resolve(nwritten);
});
});
const data = await Deno.readFile(tempFile);
await Deno.remove(tempFile);
assertEquals(bytesWrite, 5);
assertEquals(decoder.decode(data), "hello");
},
});
Deno.test({
name: "Data is written synchronously to the file with the correct length",
fn() {
const tempFile: string = Deno.makeTempFileSync();
using file = Deno.openSync(tempFile, {
create: true,
write: true,
read: true,
});
const buffer = Buffer.from("hello world");
const bytesWrite = writeSync(file.rid, buffer, 0, 5);
const data = Deno.readFileSync(tempFile);
Deno.removeSync(tempFile);
assertEquals(bytesWrite, 5);
assertEquals(decoder.decode(data), "hello");
},
});
Deno.test({
name: "Data is padded if position > length",
async fn() {
const tempFile: string = Deno.makeTempFileSync();
using file = await Deno.open(tempFile, {
create: true,
write: true,
read: true,
});
const str = "hello world";
const buffer = Buffer.from(str);
const bytesWritten = writeSync(file.rid, buffer, 0, str.length, 4);
const data = Deno.readFileSync(tempFile);
Deno.removeSync(tempFile);
assertEquals(bytesWritten, str.length);
// Check if result is padded
assertEquals(decoder.decode(data), "\x00\x00\x00\x00hello world");
},
});
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