[FE] 테스트 오류 수정

frontend/jest.config.ts

@@ -171,9 +171,7 @@ const config: Config = {
   // ],
 
   // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
-  // testPathIgnorePatterns: [
-  //   "/node_modules/"
-  // ],
+  testPathIgnorePatterns: ['/node_modules/', '/.next/', '<rootDir>/tests/'],
 
   // The regexp pattern or array of patterns that Jest uses to detect test files
   // testRegex: [],

frontend/src/components/__tests__/landing/MeetingFormModal.test.tsx

@@ -37,6 +37,12 @@ jest.mock('@/components/common/Modal', () => {
   };
 });
 
+jest.mock('@/components/common/Portal', () => {
+  return function MockPortal({ children }: { children: React.ReactNode }) {
+    return <div id="mock-portal">{children}</div>;
+  };
+});
+
 describe('MeetingFormModal 컴포넌트 테스트', () => {
   const closeModal = jest.fn();
   const push = jest.fn();