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pytest for the error route

tests/test_error.py

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+# utility functions for testing
+def register_for_test(client, data):
+    # Register
+    response = client.post('/register', data={
+        'email': data['email'],
+        'password': data['password'],
+        'name': data['name']
+    }, follow_redirects=True)
+    assert response.status_code == 200
+
+
+def test_500_page(client):
+    response = client.get('/trigger-500')
+    assert response.status_code == 500
+    assert b"500 - Internal Server Error" in response.data
+
+
+def test_404_page(client):
+    response = client.get('/nonexistent')
+    assert response.status_code == 404
+    assert b"Page Not Found" in response.data
+
+
+def test_403_page(client):
+    # Register as an admin
+    register_for_test(client, data={
+        'email': '[email protected]',
+        'password': 'admin',
+        'name': 'Super Admin'
+    })
+
+    logout_response = client.get('/logout')
+    assert logout_response.status_code == 302
+
+    # Register as a test user
+    register_for_test(client, data={
+        'email': '[email protected]',
+        'password': 'test',
+        'name': 'Test User'
+    })
+
+    # Log in as test user
+    response = client.post('/login', data={
+        'email': '[email protected]',
+        'password': 'test'
+    }, follow_redirects=True)
+
+    # Ensure the login was successful
+    assert response.status_code == 200
+
+    # Move to /useful_info route, only allowed by admin
+    response = client.get('/useful_info')
+
+    # Check that the status code is 403 (forbidden) for non-admin users
+    assert response.status_code == 403
+    assert b"Forbidden" in response.data
+