Start writing unit tests

tests/services_test.yml

@@ -0,0 +1,13 @@
+# This config is only here to stop a deprecation notice for Symfony 7
+framework:
+    http_method_override: false
+
+services:
+    pcm_icon.icon_extension:
+        alias: Pcm\IconBundle\Twig\Functions\IconExtension
+        public: true
+
+    Pcm\IconBundle\Twig\Functions\IconExtension:
+        arguments:
+            $directories:
+                - '%kernel.project_dir%/tests/icons'