Add tests for unwrapping

Author: Márk Sági-Kazár

spec/FulfilledPromiseSpec.php

@@ -64,4 +64,9 @@ function it_has_a_response(ResponseInterface $response)
     {
         $this->wait()->shouldReturn($response);
     }
+
+    function it_does_not_unwrap_a_value(ResponseInterface $response)
+    {
+        $this->wait(false)->shouldNotReturn($response);
+    }
 }

spec/RejectedPromiseSpec.php

@@ -70,4 +70,9 @@ function it_returns_an_exception()
         $this->beConstructedWith($exception);
         $this->shouldThrow($exception)->duringWait();
     }
+
+    function it_does_not_unwrap_a_value(ResponseInterface $response)
+    {
+        $this->shouldNotThrow('Exception')->duringWait(false);
+    }
 }