Adding tests for Invokable classes as event handlers

tests/Assets/InvokableEventHandler.php

@@ -0,0 +1,17 @@
+<?php
+namespace Affinity4\Magic\Tests\Assets;
+
+class InvokableEventHandler
+{
+    private $number = 0;
+
+    public function __construct(int $number)
+    {
+        $this->number = $number;
+    }
+
+    public function __invoke(string $save)
+    {
+        echo "$save {$this->number}\n";
+    }
+}

tests/MagicEventCallbacksTest.php

@@ -42,10 +42,9 @@ public function testAddingEventHandlersAndTriggeringEvent()
 
         ob_start();
         $MagicEvent->onSave('Save');
-        $output = ob_get_clean();
+        $output = ob_get_contents();
+        ob_end_clean();
 
         $this->assertEquals("Save 1\nSave 2\nSave 3\n", $output);
     }
-
-
 }

tests/MagicEventInvokableClassTest.php

@@ -0,0 +1,45 @@
+<?php
+namespace Affinity4\Magic\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Affinity4\Magic\Tests\Assert\Assertions;
+use Affinity4\Magic\Tests\Assets\MagicEvent;
+use Affinity4\Magic\Tests\Assets\InvokableEventHandler;
+use Affinity4\Magic\Magic;
+
+/**
+ * @group MagicEventTest
+ * @group MagicEventInvokableClassTest
+ */
+class MagicEventInvokableClassTest extends TestCase
+{
+    use Assertions;
+
+    public function testClassHasMagicTrait()
+    {
+        $ReflectionClass = new \ReflectionClass(MagicEvent::class);
+        $traits = $ReflectionClass->getTraits();
+
+        $this->assertArrayHasKey(Magic::class, $traits);
+    }
+
+    public function testOnSavePropertyExists()
+    {
+        $this->assertPropertyExists(MagicEvent::class, 'onSave');
+    }
+
+    public function testAddingEventHandlersAndTriggeringEvent()
+    {
+        $MagicEvent = new MagicEvent;
+        $MagicEvent->onSave[] = new InvokableEventHandler(1);
+        $MagicEvent->onSave[] = new InvokableEventHandler(2);
+        $MagicEvent->onSave[] = new InvokableEventHandler(3);
+
+        ob_start();
+        $MagicEvent->onSave('Save');
+        $output = ob_get_contents();
+        ob_end_clean();
+
+        $this->assertEquals("Save 1\nSave 2\nSave 3\n", $output);
+    }
+}