Add method to get last request sent

spec/HttpMethodsClientSpec.php

@@ -85,6 +85,16 @@ function it_sends_request_with_underlying_client(HttpClient $client, MessageFact
         $this->beConstructedWith($client, $messageFactory);
         $this->sendRequest($request)->shouldReturn($response);
     }
+
+    function it_returns_last_request(HttpClient $client, MessageFactory $messageFactory, RequestInterface $request, ResponseInterface $response)
+    {
+        $client->sendRequest($request)->shouldBeCalled()->willReturn($response);
+
+        $this->beConstructedWith($client, $messageFactory);
+        $this->getLastRequest()->shouldReturn(null);
+        $this->sendRequest($request)->shouldReturn($response);
+        $this->getLastRequest()->shouldReturn($request);
+    }
 }
 
 class HttpMethodsClientStub extends HttpMethodsClient

src/HttpMethodsClient.php

@@ -36,6 +36,11 @@ class HttpMethodsClient implements HttpClient
      */
     private $messageFactory;
 
+    /**
+     * @var RequestInterface
+     */
+    private $lastRequest;
+
     /**
      * @param HttpClient     $httpClient     The client to send requests with.
      * @param MessageFactory $messageFactory The message factory to create requests.
@@ -200,6 +205,20 @@ public function send($method, $uri, array $headers = [], $body = null)
      */
     public function sendRequest(RequestInterface $request)
     {
+        $this->lastRequest = $request;
+
         return $this->httpClient->sendRequest($request);
     }
+
+    /**
+     * Get the last request that was sent via this client.
+     *
+     * Note that this will not return requests made directly through the underlying client's sendRequest method.
+     *
+     * @return RequestInterface|null
+     */
+    public function getLastRequest()
+    {
+        return $this->lastRequest;
+    }
 }