Add and fix tests

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/views/error_view.ex

@@ -25,7 +25,10 @@ defmodule MobilizonWeb.ErrorView do
 
   # In case no render clause matches or no
   # template is found, let's render it as 500
-  def template_not_found(_template, assigns) do
+  def template_not_found(template, assigns) do
+    require Logger
+    Logger.error("Template not found")
+    Logger.error(inspect(template))
     render("500.html", assigns)
   end
 end