diff --git a/tests/unit/utils/file.test.ts b/tests/unit/utils/file.test.ts
index 5091966..b4d0fca 100644
--- a/tests/unit/utils/file.test.ts
+++ b/tests/unit/utils/file.test.ts
@@ -3,34 +3,49 @@ import {
   getFileExtension,
   formatFileExtension,
 } from '../../../app/utils/file';
-import { expect, test } from 'vitest';
+import { expect, test, describe } from 'vitest';
 
 /**
  * 单元测试: formatFileSize
  */
-test('formatFileSize - format bytes correctly', () => {
-  expect(formatFileSize(500)).toBe('500.00 B');
-});
-test('formatFileSize - format kilobytes correctly', () => {
-  expect(formatFileSize(2048)).toBe('2.00 KB');
-});
-test('formatFileSize - format megabytes correctly', () => {
-  expect(formatFileSize(5 * 1024 * 1024)).toBe('5.00 MB');
+describe('formatFileSize', () => {
+  test('format bytes correctly', () => {
+    expect(formatFileSize(500)).toBe('500.00 B');
+  });
+  test('format kilobytes correctly', () => {
+    expect(formatFileSize(2048)).toBe('2.00 KB');
+  });
+  test('format megabytes correctly', () => {
+    expect(formatFileSize(5 * 1024 * 1024)).toBe('5.00 MB');
+  });
 });
 
 /**
- * 单元测试: getFileExtension, formatFileExtension
+ * 单元测试: getFileExtension
  */
-test('getFileExtension - extract extension from filename', () => {
-  expect(getFileExtension('document.pdf')).toBe('pdf');
-});
-test('getFileExtension - handle filenames without extension', () => {
-  expect(getFileExtension('README')).toBe('');
+describe('getFileExtension', () => {
+  test('extract extension from filename', () => {
+    expect(getFileExtension('document.pdf')).toBe('pdf');
+  });
+  test('handle filenames without extension', () => {
+    expect(getFileExtension('README')).toBe('');
+  });
+  test('handle multiple dots in filename', () => {
+    expect(getFileExtension('archive.tar.gz')).toBe('gz');
+  });
+  test('handle empty filename', () => {
+    expect(getFileExtension('')).toBe('');
+  });
 });
 
-test('formatFileExtension - format extension without dot', () => {
-  expect(formatFileExtension('txt')).toBe('TXT');
-});
-test('formatFileExtension - format extension with dot', () => {
-  expect(formatFileExtension('.jpg')).toBe('JPG');
+/**
+ * 单元测试: formatFileExtension
+ */
+describe('formatFileExtension', () => {
+  test('format extension without dot', () => {
+    expect(formatFileExtension('txt')).toBe('TXT');
+  });
+  test('format extension with dot', () => {
+    expect(formatFileExtension('.jpg')).toBe('JPG');
+  });
 });