change test

__tests__/render_home_page.test.js

@@ -2,12 +2,20 @@ import { render, screen, fireEvent, waitFor } from '@testing-library/react';
 import '@testing-library/jest-dom';
 import Home from "../src/app/page";
 import { customLog, customLogClear } from '../src/app/scripts';
+import { useRouter } from 'next/router';
+
 
 jest.mock('../src/app/scripts', () => ({
     customLog: jest.fn(),
     customLogClear: jest.fn(),
 }));
 
+jest.mock('next/router', () => ({
+    useRouter: jest.fn().mockReturnValue({
+        push: jest.fn(), 
+    }),
+}));
+
 jest.mock('../src/solver/glpk.min.js', () => ({
     LPF_ECOND: 2,
 }));

src/app/glp/page.tsx

@@ -216,7 +216,7 @@ const GlpPage = () => {
 
         } catch (err) {
             setIsLoading(false);
-            //addMessage("<div class='alert alert-danger'>" + err.toString() + "</div>");
+            addMessage("<div class='alert alert-danger'>" + (err as Error).toString() + "</div>");
             console.log(err);
         }
     };