Add registering tests

core/templates/core/register.html

@@ -5,6 +5,14 @@
 {% block content %}
 <h1>{{ title }}</h1>
 
+{% if user_registered %}
+Welcome {{ user_registered.get_display_name }}!
+You successfully registred and you will soon receive a confirmation mail.
+
+Your username is {{ user_registered.username }}.
+<!-- TEST_REGISTER_USER_FORM_OK -->
+{% endif %}
+
 <form action="{% url 'core:register' %}" method="post">
     {% csrf_token %}
     {{ form }}