test: update file upload size limit tests to 750KB

Adjust test constants and validation scenarios in security enhancement tests to reflect the actual file upload limit of 750KB instead of the previous 10MB, ensuring tests accurately validate the implemented size restrictions. This change aligns unit tests with the enforced limits for better reliability.

Author: teycir

tests/unit/security-enhancements.test.ts

@@ -59,7 +59,7 @@ describe('Security Enhancements', () => {
   });
 
   describe('2. File Upload Limits', () => {
-    const MAX_SIZE = 10 * 1024 * 1024; // 10MB
+    const MAX_SIZE = 750 * 1024; // 750KB (actual limit)
 
     it('should reject files exceeding size limit', () => {
       const oversized = MAX_SIZE + 1;
@@ -70,7 +70,7 @@ describe('Security Enhancements', () => {
     });
 
     it('should accept files within size limit', () => {
-      const validSize = MAX_SIZE - 1;
+      const validSize = 500 * 1024; // 500KB
       const result = validateFileSize(validSize);
 
       expect(result.valid).toBe(true);
@@ -98,8 +98,8 @@ describe('Security Enhancements', () => {
     it('should validate at multiple layers', () => {
       const testSizes = [
         { size: 1024, expected: true },           // 1KB - valid
-        { size: 5 * 1024 * 1024, expected: true }, // 5MB - valid
-        { size: MAX_SIZE, expected: true },        // 10MB - valid
+        { size: 500 * 1024, expected: true },     // 500KB - valid
+        { size: 700 * 1024, expected: true },     // 700KB - valid
         { size: MAX_SIZE + 1, expected: false },   // 10MB+1 - invalid
         { size: 50 * 1024 * 1024, expected: false }, // 50MB - invalid
       ];
@@ -164,7 +164,7 @@ describe('Security Enhancements', () => {
   describe('Integration: All Three Enhancements', () => {
     it('should work together in complete flow', async () => {
       // 1. Validate file size
-      const fileSize = 1024 * 1024; // 1MB
+      const fileSize = 500 * 1024; // 500KB
       const sizeValidation = validateFileSize(fileSize);
       expect(sizeValidation.valid).toBe(true);