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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import * as path from "@std/path";
import { Buffer } from "node:buffer";
import * as fs from "node:fs/promises";
import { assert, assertEquals } from "@std/assert";
const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));
const testData = path.resolve(moduleDir, "testdata", "hello.txt");
const decoder = new TextDecoder();
Deno.test("readFileSuccess", async function () {
const fileHandle = await fs.open(testData);
const data = await fileHandle.readFile();
assert(data instanceof Uint8Array);
assertEquals(decoder.decode(data as Uint8Array), "hello world");
await fileHandle.close();
});
Deno.test("read", async function () {
const fileHandle = await fs.open(testData);
const byteLength = "hello world".length;
const buf = new Buffer(byteLength);
await fileHandle.read(buf, 0, byteLength, 0);
assertEquals(decoder.decode(buf as Uint8Array), "hello world");
await fileHandle.close();
});
Deno.test("read specify opt", async function () {
const fileHandle = await fs.open(testData);
const byteLength = "hello world".length;
const opt = {
buffer: new Buffer(byteLength),
offset: 6,
length: 5,
position: 6,
};
let res = await fileHandle.read(opt);
assertEquals(res.bytesRead, 5);
assertEquals(
new TextDecoder().decode(res.buffer.subarray(6) as Uint8Array),
"world",
);
const opt2 = {
buffer: new Buffer(byteLength),
length: 5,
position: 0,
};
res = await fileHandle.read(opt2);
assertEquals(res.bytesRead, 5);
assertEquals(
decoder.decode(res.buffer.subarray(0, 5) as Uint8Array),
"hello",
);
await fileHandle.close();
});
Deno.test("[node/fs filehandle.write] Write from Buffer", async function () {
const tempFile: string = await Deno.makeTempFile();
const fileHandle = await fs.open(tempFile, "a+");
const buffer = Buffer.from("hello world");
const res = await fileHandle.write(buffer, 0, 5, 0);
const data = Deno.readFileSync(tempFile);
await Deno.remove(tempFile);
await fileHandle.close();
assertEquals(res.bytesWritten, 5);
assertEquals(decoder.decode(data), "hello");
});
Deno.test("[node/fs filehandle.write] Write from string", async function () {
const tempFile: string = await Deno.makeTempFile();
const fileHandle = await fs.open(tempFile, "a+");
const str = "hello world";
const res = await fileHandle.write(str);
const data = Deno.readFileSync(tempFile);
await Deno.remove(tempFile);
await fileHandle.close();
assertEquals(res.bytesWritten, 11);
assertEquals(decoder.decode(data), "hello world");
});
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