diff --git a/test/common.ts b/test/common.ts
index af10198c0..3a38b69b0 100644
--- a/test/common.ts
+++ b/test/common.ts
@@ -1,4 +1,3 @@
-import { Stats, FileType, type BigIntStats } from '../src/stats';
 import { fs } from '../src/index';
 import * as path from 'path';
 import { statSync, readFileSync, readdirSync } from 'fs';
@@ -25,7 +24,3 @@ function copy(_p: string) {
 copy(fixturesDir);
 
 export { fs };
-
-export function createMockStats(mode: number | bigint): Stats | BigIntStats {
-	return new Stats(FileType.FILE, -1, mode);
-}
diff --git a/test/tests/chmod.test.ts b/test/tests/chmod.test.ts
index 525568067..461ab0cda 100644
--- a/test/tests/chmod.test.ts
+++ b/test/tests/chmod.test.ts
@@ -1,104 +1,47 @@
-import { fs, createMockStats } from '../common';
-import * as path from 'path';
-import { jest } from '@jest/globals';
+import { fs } from '../common';
 
-const isWindows = process.platform === 'win32';
 const asyncMode = 0o777;
-const modeSync = 0o644;
+const syncMode = 0o644;
 
 describe('chmod tests', () => {
-	it('should change file mode using chmod', async () => {
+	test('chmod', async () => {
 		const file1 = 'a.js';
 
-		jest.spyOn(fs, 'chmod').mockImplementation(async (path, mode) => {
-			expect(path).toBe(file1);
-			expect(mode).toBe(asyncMode.toString(8));
-		});
+		await fs.promises.chmod(file1, asyncMode.toString(8));
 
-		jest.spyOn(fs, 'chmodSync').mockImplementation((path, mode) => {
-			expect(path).toBe(file1);
-			expect(mode).toBe(modeSync);
-		});
+		const stats = await fs.promises.stat(file1);
+		expect(stats.mode & 0o777).toBe(asyncMode);
 
-		jest.spyOn(fs, 'statSync').mockReturnValue(createMockStats(isWindows ? asyncMode & 0o777 : asyncMode));
-
-		await changeFileMode(file1);
+		fs.chmodSync(file1, syncMode);
+		expect(fs.statSync(file1).mode & 0o777).toBe(syncMode);
 	});
 
-	it('should change file mode using fchmod', async () => {
+	test('fchmod', async () => {
 		const file2 = 'a1.js';
 
-		jest.spyOn(fs, 'open').mockImplementation(async (path, flags, mode) => {
-			expect(path).toBe(file2);
-			expect(flags).toBe('a');
-			return 123;
-		});
-
-		jest.spyOn(fs, 'fchmod').mockImplementation(async (fd, mode) => {
-			expect(fd).toBe(123);
-			expect(mode).toBe(asyncMode.toString(8));
-		});
+		const handle = await fs.promises.open(file2, 'a', 0o644);
 
-		jest.spyOn(fs, 'fchmodSync').mockImplementation((fd, mode) => {
-			expect(fd).toBe(123);
-			expect(mode).toBe(modeSync);
-		});
+		await handle.chmod(asyncMode);
+		const stats = await handle.stat();
 
-		jest.spyOn(fs, 'fstatSync').mockReturnValue(createMockStats(isWindows ? asyncMode & 0o777 : asyncMode));
+		expect(stats.mode & 0o777).toBe(asyncMode);
 
-		await changeFileMode(file2);
+		fs.fchmodSync(handle.fd, syncMode);
+		expect(fs.statSync(file2).mode & 0o777).toBe(syncMode);
 	});
 
-	it('should change symbolic link mode using lchmod', async () => {
-		const link = path.join('symbolic-link');
-		const file2 = 'a1.js';
-
-		jest.spyOn(fs, 'unlinkSync').mockImplementation(path => {
-			expect(path).toBe(link);
-		});
+	test('lchmod', async () => {
+		const link = 'symbolic-link';
+		const target = 'a1.js';
 
-		jest.spyOn(fs, 'symlinkSync').mockImplementation((target, path) => {
-			expect(target).toBe(file2);
-			expect(path).toBe(link);
-		});
+		await fs.promises.unlink(link);
+		await fs.promises.symlink(target, link);
+		await fs.promises.lchmod(link, asyncMode);
 
-		jest.spyOn(fs, 'lchmod').mockImplementation(async (path, mode) => {
-			expect(path).toBe(link);
-			expect(mode).toBe(asyncMode);
-		});
+		const stats = await fs.promises.lstat(link);
+		expect(stats.mode & 0o777).toBe(asyncMode);
 
-		jest.spyOn(fs, 'lchmodSync').mockImplementation((path, mode) => {
-			expect(path).toBe(link);
-			expect(mode).toBe(modeSync);
-		});
-
-		jest.spyOn(fs, 'lstatSync').mockReturnValue(createMockStats(isWindows ? asyncMode & 0o777 : asyncMode));
-
-		await changeSymbolicLinkMode(link, file2);
+		fs.lchmodSync(link, syncMode);
+		expect(fs.lstatSync(link).mode & 0o777).toBe(syncMode);
 	});
 });
-
-async function changeFileMode(file: string): Promise<void> {
-	await fs.promises.chmod(file, asyncMode.toString(8));
-
-	const statResult = await fs.promises.stat(file);
-	expect(statResult.mode & 0o777).toBe(isWindows ? asyncMode & 0o777 : asyncMode);
-
-	fs.chmodSync(file, modeSync);
-	const statSyncResult = fs.statSync(file);
-	expect(statSyncResult.mode & 0o777).toBe(isWindows ? modeSync & 0o777 : modeSync);
-}
-
-async function changeSymbolicLinkMode(link: string, target: string): Promise<void> {
-	await fs.promises.unlink(link);
-	await fs.promises.symlink(target, link);
-
-	await fs.promises.lchmod(link, asyncMode);
-
-	const lstatResult = await fs.promises.lstat(link);
-	expect(lstatResult.mode & 0o777).toBe(isWindows ? asyncMode & 0o777 : asyncMode);
-
-	fs.lchmodSync(link, modeSync);
-	const lstatSyncResult = fs.lstatSync(link);
-	expect(lstatSyncResult.mode & 0o777).toBe(isWindows ? modeSync & 0o777 : modeSync);
-}
diff --git a/test/tests/writeFile.test.ts b/test/tests/writeFile.test.ts
index ec797f218..637094d27 100644
--- a/test/tests/writeFile.test.ts
+++ b/test/tests/writeFile.test.ts
@@ -1,15 +1,10 @@
 import { fs } from '../common';
-
-import { jest } from '@jest/globals';
 import { decode } from '../../src';
 
 const s =
 	'南越国是前203年至前111年存在于岭南地区的一个国家，国都位于番禺，疆域包括今天中国的广东、广西两省区的大部份地区，福建省、湖南、贵州、云南的一小部份地区和越南的北部。南越国是秦朝灭亡后，由南海郡尉赵佗于前203年起兵兼并桂林郡和象郡后建立。前196年和前179年，南越国曾先后两次名义上臣属于西汉，成为西汉的“外臣”。前112年，南越国末代君主赵建德与西汉发生战争，被汉武帝于前111年所灭。南越国共存在93年，历经五代君主。南越国是岭南地区的第一个有记载的政权国家，采用封建制和郡县制并存的制度，它的建立保证了秦末乱世岭南地区社会秩序的稳定，有效的改善了岭南地区落后的政治、经济现状。\n';
 
 describe('fs.writeFile', () => {
-	afterEach(() => {
-		jest.restoreAllMocks();
-	});
 
 	it('should write and read file with specified content', async () => {
 		const filename = 'test.txt';
@@ -27,8 +22,7 @@ describe('fs.writeFile', () => {
 		const buf = Buffer.from(s, 'utf8');
 
 		await fs.promises.writeFile(filename, buf);
-		const buffer = await fs.promises.readFile;
-		filename;
+		const buffer = await fs.promises.readFile(filename);
 		expect(buf.length).toBe(buffer.length);
 
 		await fs.promises.unlink(filename);
diff --git a/test/tests/writeFileSync.test.ts b/test/tests/writeFileSync.test.ts
index 7179ef8f9..263777901 100644
--- a/test/tests/writeFileSync.test.ts
+++ b/test/tests/writeFileSync.test.ts
@@ -1,23 +1,11 @@
 import { fs } from '../common';
-import { jest } from '@jest/globals';
 
 describe('File Writing with Custom Mode', () => {
-	afterEach(() => {
-		jest.restoreAllMocks();
-	});
 
 	it('should write file synchronously with custom mode', async () => {
 		const file = 'testWriteFileSync.txt';
 		const mode = 0o755;
 
-		jest.spyOn(fs, 'openSync').mockImplementation((...args) => {
-			return fs.openSync.apply(fs, args);
-		});
-
-		jest.spyOn(fs, 'closeSync').mockImplementation((...args) => {
-			return fs.closeSync.apply(fs, args);
-		});
-
 		fs.writeFileSync(file, '123', { mode: mode });
 
 		const content = fs.readFileSync(file, { encoding: 'utf8' });
@@ -33,14 +21,6 @@ describe('File Writing with Custom Mode', () => {
 		const file = 'testAppendFileSync.txt';
 		const mode = 0o755;
 
-		jest.spyOn(fs, 'openSync').mockImplementation((...args) => {
-			return fs.openSync.apply(fs, args);
-		});
-
-		jest.spyOn(fs, 'closeSync').mockImplementation((...args) => {
-			return fs.closeSync.apply(fs, args);
-		});
-
 		fs.appendFileSync(file, 'abc', { mode: mode });
 
 		const content = fs.readFileSync(file, { encoding: 'utf8' });