Merge gmpl main2 (#37)

* addPage for gmpl

* implement gmpl full_functional

* final

* del unused variable

* change type of variable

* change test

* code fix

* code fix

* fixing var error (var -> let)

---------

Co-authored-by: SinusFox <61253950+SinusFox@users.noreply.github.com>

__tests__/render_home_page.test.js

@@ -1,22 +1,31 @@
-import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { render, screen } from '@testing-library/react';
 import '@testing-library/jest-dom';
-import Home from "../src/app/page";
+import Home from '../src/app/page';
 import { customLog, customLogClear } from '../src/app/scripts';
 
+// Mock customLog and customLogClear
 jest.mock('../src/app/scripts', () => ({
     customLog: jest.fn(),
     customLogClear: jest.fn(),
 }));
 
+// Mock next/navigation instead of next/router
+jest.mock('next/navigation', () => ({
+    useRouter: jest.fn().mockReturnValue({
+        push: jest.fn(),
+    }),
+}));
+
+// Mock GLPKAPI to avoid issues with undefined LPF_ECOND
 jest.mock('../src/solver/glpk.min.js', () => ({
     LPF_ECOND: 2,
 }));
 
 test('render home page', () => {
-    // render website
+    // Render Home component
     render(<Home />);
 
-    // check if text is in document
-    const headingElement = screen.getByText(/OR-Tool/i);  // text search in document
+    // Check if the heading text "OR-Tool" is present in the document
+    const headingElement = screen.getByText(/OR-Tool/i);  // Match text that contains "OR-Tool"
     expect(headingElement).toBeInTheDocument();
 });

__tests__/scripts.test.js

@@ -20,6 +20,13 @@ jest.mock('../src/solver/glpk.min.js', () => ({
 // Mocking console.log
 const consoleLogMock = jest.spyOn(console, 'log').mockImplementation(() => {});
 
+// Mock useRouter to avoid invariant error
+jest.mock('next/navigation', () => ({
+  useRouter: jest.fn(() => ({
+    push: jest.fn(), // Mock the 'push' function
+  })),
+}));
+
 beforeEach(() => {
     document.body.innerHTML = `
       <div>
@@ -90,7 +97,7 @@ test('calculate_click should display "Calculating" in the output box', () => {
     document.getElementById('bounds').value = 'x <= 5';
     document.getElementById('vars').value = 'x\ny';
 
-    // Simuliere den Button-Klick, der die Berechnung startet
+    // Simulate the button click to trigger calculation
     fireEvent.click(screen.getByText('Calculate'));
 
     // Check the contents of out box
@@ -101,4 +108,3 @@ test('calculate_click should display "Calculating" in the output box', () => {
     mockClear.mockRestore();
     mockLog.mockRestore();
 });
-