test element update dispatcher

backend/tests/Unit/Element/ElementRepositoryContractTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Tests\Unit\Element;
+
+use App\Element\Element;
+use App\Element\ElementRepository;
+use ReflectionMethod;
+use Tests\TestCase;
+
+class ElementRepositoryContractTest extends TestCase
+{
+    public function testUpdateAcceptsOnlyElement(): void
+    {
+        $method = new ReflectionMethod(ElementRepository::class, 'update');
+        $parameters = $method->getParameters();
+
+        $this->assertCount(1, $parameters);
+        $this->assertSame('element', $parameters[0]->getName());
+        $this->assertSame(
+            Element::class,
+            $parameters[0]->getType()->getName(),
+        );
+    }
+}