1 files changed, 88 insertions, 0 deletions
diff --git a/tests/unit_node/_fs/_fs_handle_test.ts b/tests/unit_node/_fs/_fs_handle_test.ts
new file mode 100644
index 000000000..151d4d752
--- /dev/null
+++ b/tests/unit_node/_fs/_fs_handle_test.ts
@@ -0,0 +1,88 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import * as path from "@test_util/std/path/mod.ts";
+import { Buffer } from "node:buffer";
+import * as fs from "node:fs/promises";
+import { assert, assertEquals } from "@test_util/std/assert/mod.ts";
+
+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,
+  };
+  let res = await fileHandle.read(opt);
+
+  assertEquals(res.bytesRead, byteLength);
+  assertEquals(new TextDecoder().decode(res.buffer as Uint8Array), "world");
+
+  const opt2 = {
+    buffer: new Buffer(byteLength),
+    length: 5,
+    position: 0,
+  };
+  res = await fileHandle.read(opt2);
+
+  assertEquals(res.bytesRead, byteLength);
+  assertEquals(decoder.decode(res.buffer 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");
+});