diff --git a/tests/AttributableTest.php b/tests/AttributableTest.php
index 0d1603d..d2eb04c 100644
--- a/tests/AttributableTest.php
+++ b/tests/AttributableTest.php
@@ -40,4 +40,13 @@ public function testCall()
         $mock->foo('bar');
         $this->assertEquals('bar', $mock->get('foo'));
     }
+
+    public function testUnset()
+    {
+        $mock = new Mock();
+        $mock['foo'] = 'bar';
+
+        unset($mock['foo']);
+        $this->assertFalse($mock->offsetExists('foo'));
+    }
 }
diff --git a/tests/stubs/Mock.php b/tests/stubs/Mock.php
index 0e9935a..104aa84 100644
--- a/tests/stubs/Mock.php
+++ b/tests/stubs/Mock.php
@@ -1,6 +1,6 @@
 <?php
 
-class Mock {
+class Mock implements ArrayAccess, JsonSerializable {
 
     use rkgrep\Attributable;