✨ feat(App): add ErrorPage

src/App.tsx

@@ -1,11 +1,12 @@
 import { createBrowserRouter, RouterProvider } from 'react-router-dom'
 
-import { MainPage } from 'components/pages'
+import { ErrorPage, MainPage } from 'components/pages'
 
 const router = createBrowserRouter([
   {
     path: '/',
     element: <MainPage />,
+    errorElement: <ErrorPage />,
   },
 ])
 

src/components/pages/ErrorPage/ErrorPage.test.tsx

@@ -0,0 +1,28 @@
+import { describe, it, expect, afterEach } from 'vitest'
+import { screen, cleanup, render } from '@testing-library/react'
+import { RouterProvider, createMemoryRouter } from 'react-router-dom'
+
+import ErrorPage from './ErrorPage'
+
+// Tests
+describe('Renders ErrorPage correctly', async () => {
+  /**
+   * Resets all renders after each test
+   */
+  afterEach(() => {
+    cleanup()
+  })
+
+  /**
+   * Passes - shows title correctly
+   */
+  it('Should render the error page correctly', () => {
+    const router = createMemoryRouter([{ path: '/', element: <div />, errorElement: <ErrorPage /> }], { initialEntries: ['/some/bad/route'] })
+
+    render(<RouterProvider router={router} />)
+
+    expect(screen.getByText('Oops!')).toBeInTheDocument()
+    expect(screen.getByText('Sorry, an unexpected error has occurred.')).toBeInTheDocument()
+    expect(screen.getByText('404 Not Found')).toBeInTheDocument()
+  })
+})

src/components/pages/ErrorPage/ErrorPage.tsx

@@ -0,0 +1,22 @@
+import { isRouteErrorResponse, useRouteError } from 'react-router-dom'
+
+const ErrorPage: React.FC = () => {
+  const error: unknown = useRouteError()
+  if (isRouteErrorResponse(error)) {
+    return (
+      <div id="error-page" className="flex flex-col gap-8 justify-center items-center h-screen">
+        <h1 className="text-4xl font-bold">Oops!</h1>
+        <p>Sorry, an unexpected error has occurred.</p>
+        {isRouteErrorResponse(error) && (
+          <p className="text-slate-400">
+            <i>
+              {error.status} {error.statusText}
+            </i>
+          </p>
+        )}
+      </div>
+    )
+  }
+}
+
+export default ErrorPage

src/components/pages/ErrorPage/index.ts

@@ -0,0 +1 @@
+export { default } from './ErrorPage'

src/components/pages/index.ts

@@ -1 +1,3 @@
 export { default as MainPage } from './MainPage'
+
+export { default as ErrorPage } from './ErrorPage'