Add the login page, add some comments to the test.

app/src/Bootstrap.php

@@ -124,7 +124,6 @@ class Bootstrap
          * @var Configuration
          */
         $config = $container->get('config');
-        $app->addErrorMiddleware(true, true, true);
 
         // Twig
         $templatePath = __DIR__ . "/../templates";
@@ -140,6 +139,9 @@ class Bootstrap
         $twig->getEnvironment()
              ->addGlobal('flash', $flash);
         $app->add(TwigMiddleware::create($app, $twig));
+
+        // Add the error handling middleware
+        $app->addErrorMiddleware(true, true, true);
     }
 
     /**

app/src/Controller/User/LoginUserPage.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Slovocast\Controller\User;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Slovocast\Controller\Controller;
+
+class LoginUserPage extends Controller
+{
+    public function respond(): Response
+    {
+        return $this->render('user/login');
+    }
+}

app/templates/user/login.twig

@@ -0,0 +1,19 @@
+{% extends 'layouts/skeleton.twig' %}
+
+{% block content %}
+<div>
+    <form action="/login" method="post">
+        <div>
+            <label for="email">Email<br>
+            <input name="email" type="text" required>
+        </div>
+        <div>
+            <label for="password">Password<br>
+            <input name="password" type="password" required>
+        </div>
+        <div>
+            <input type="submit" label="Submit">
+        </div>
+    </form>
+</div>
+{% endblock %}

app/tests/Controller/User/RegisterUserActionTest.php

@@ -93,8 +93,10 @@ class RegisterUserActionTest extends TestCase
         $this->assertEquals(400, $response->getStatusCode());
 
         $responseBody = $response->getBody();
+        // get the class of the flash on the rendered page
         $this->assertTrue((bool)preg_match('/flash error/', $responseBody));
-        $this->assertTrue((bool)preg_match('/Unable to register user/', $responseBody));
+        // get the text inside the flash
+        $this->assertTrue((bool)preg_match('/Unable to register user\./', $responseBody));
 
         /**
          * The Flash messages are already exhausted while rendering the