TRF Certest first commit

app/Presenters/Traits/Presentable.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Vanguard\Presenters\Traits;
+
+use Exception;
+use Vanguard\Presenters\Presenter;
+
+trait Presentable
+{
+    protected ?Presenter $presenterInstance = null;
+
+    /**
+     * @throws Exception
+     */
+    public function present(): Presenter
+    {
+        if (is_object($this->presenterInstance)) {
+            return $this->presenterInstance;
+        }
+
+        if (property_exists($this, 'presenter') and class_exists($this->presenter)) {
+            return $this->presenterInstance = new $this->presenter($this);
+        }
+
+        throw new Exception('Property $presenter was not set correctly in '.get_class($this));
+    }
+}