diff --git a/composer.json b/composer.json
index 6c7c33a..bdd7d14 100644
--- a/composer.json
+++ b/composer.json
@@ -15,12 +15,13 @@
         "phpunit/phpunit": "^4.4",
         "php-http/discovery": "~0.2@dev",
         "php-http/httplug": "~1.0@dev",
+        "php-http/httplug-async": "~0.1@dev",
         "guzzlehttp/psr7": "^1.0",
         "th3n3rd/cartesian-product": "^0.3"
     },
     "autoload": {
         "psr-4": {
-            "Http\\Adapter\\Tests\\": "src/"
+            "Http\\Client\\Tests\\": "src/"
         }
     },
     "bin": [
diff --git a/fixture/server.php b/fixture/server.php
index 2ceb3f6..f45a65c 100644
--- a/fixture/server.php
+++ b/fixture/server.php
@@ -11,7 +11,7 @@
 
 require_once __DIR__.'/../src/PHPUnitUtility.php';
 
-use Http\Adapter\Tests\PHPUnitUtility;
+use Http\Client\Tests\PHPUnitUtility;
 
 $file = fopen(PHPUnitUtility::getFile(true, 'php-http-adapter.log'), 'c');
 flock($file, LOCK_EX);
diff --git a/src/HttpAsyncClientTest.php b/src/HttpAsyncClientTest.php
new file mode 100644
index 0000000..2daa27f
--- /dev/null
+++ b/src/HttpAsyncClientTest.php
@@ -0,0 +1,189 @@
+<?php
+
+namespace Http\Client\Tests;
+
+use Http\Client\HttpAsyncClient;
+
+abstract class HttpAsyncClientTest extends HttpBaseTest
+{
+    /**
+     * @var HttpAsyncClient
+     */
+    protected $httpAsyncClient;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp()
+    {
+        $this->httpAsyncClient = $this->createHttpAsyncClient();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function tearDown()
+    {
+        unset($this->httpAdapter);
+    }
+
+    /**
+     * @return HttpAsyncClient
+     */
+    abstract protected function createHttpAsyncClient();
+
+    public function testSuccessiveCallMustUseResponseInterface()
+    {
+        $request = self::$messageFactory->createRequest(
+            'GET',
+            $this->getUri(),
+            $this->defaultHeaders
+        );
+
+        $promise = $this->httpAsyncClient->sendAsyncRequest($request);
+        $this->assertInstanceOf('Http\Client\Promise', $promise);
+
+        $response = null;
+        $promise->then()->then()->then(function ($r) use(&$response) {
+            $response = $r;
+        });
+
+        $promise->wait();
+        $this->assertResponse(
+            $response,
+            [
+                'body' => 'Ok',
+            ]
+        );
+    }
+
+    public function testSuccessiveInvalidCallMustUseException()
+    {
+        $request = self::$messageFactory->createRequest(
+            'GET',
+            $this->getInvalidUri(),
+            $this->defaultHeaders
+        );
+
+        $promise = $this->httpAsyncClient->sendAsyncRequest($request);
+        $this->assertInstanceOf('Http\Client\Promise', $promise);
+
+        $exception = null;
+        $response  = null;
+        $promise->then()->then()->then(function ($r) use(&$response) {
+            $response = $r;
+        }, function ($e) use (&$exception) {
+            $exception = $e;
+        });
+
+        $promise->wait();
+
+        $this->assertNull($response);
+        $this->assertNotNull($exception);
+        $this->assertInstanceOf('\Http\Client\Exception', $exception);
+    }
+
+    /**
+     * @dataProvider requestProvider
+     * @group        integration
+     */
+    public function testAsyncSendRequest($method, $uri, array $headers, $body)
+    {
+        if ($body != null) {
+            $headers['Content-Length'] = (string)strlen($body);
+        }
+
+        $request = self::$messageFactory->createRequest(
+            $method,
+            $uri,
+            $headers,
+            $body
+        );
+
+        $promise = $this->httpAsyncClient->sendAsyncRequest($request);
+        $this->assertInstanceOf('Http\Client\Promise', $promise);
+
+        $response = null;
+        $promise->then(function ($r) use(&$response) {
+            $response = $r;
+        });
+
+        $promise->wait();
+        $this->assertResponse(
+            $response,
+            [
+                'body' => $method === 'HEAD' ? null : 'Ok',
+            ]
+        );
+        $this->assertRequest($method, $headers, $body, '1.1');
+    }
+
+    /**
+     * @group             integration
+     */
+    public function testSendAsyncWithInvalidUri()
+    {
+        $request = self::$messageFactory->createRequest(
+            'GET',
+            $this->getInvalidUri(),
+            $this->defaultHeaders
+        );
+
+        $exception = null;
+        $response  = null;
+        $promise   = $this->httpAsyncClient->sendAsyncRequest($request);
+        $this->assertInstanceOf('Http\Client\Promise', $promise);
+
+        $promise->then(function ($r) use(&$response) {
+            $response = $r;
+        }, function ($e) use (&$exception) {
+            $exception = $e;
+        });
+        $promise->wait();
+
+        $this->assertNull($response);
+        $this->assertNotNull($exception);
+        $this->assertInstanceOf('\Http\Client\Exception', $exception);
+    }
+
+    /**
+     * @dataProvider requestWithOutcomeProvider
+     * @group        integration
+     */
+    public function testSendAsyncRequestWithOutcome($uriAndOutcome, $protocolVersion, array $headers, $body)
+    {
+        if ($protocolVersion === '1.0') {
+            $body = null;
+        }
+
+        if ($body != null) {
+            $headers['Content-Length'] = (string)strlen($body);
+        }
+
+        $request = self::$messageFactory->createRequest(
+            $method = 'GET',
+            $uriAndOutcome[0],
+            $headers,
+            $body,
+            $protocolVersion
+        );
+
+        $outcome = $uriAndOutcome[1];
+        $outcome['protocolVersion'] = $protocolVersion;
+
+        $response = null;
+        $promise  = $this->httpAsyncClient->sendAsyncRequest($request);
+        $promise->then(function ($r) use(&$response) {
+            $response = $r;
+        });
+
+        $this->assertInstanceOf('Http\Client\Promise', $promise);
+        $promise->wait();
+        $this->assertResponse(
+            $response,
+            $outcome
+        );
+        $this->assertRequest($method, $headers, $body, $protocolVersion);
+    }
+}
+ 
\ No newline at end of file
diff --git a/src/HttpAdapterTest.php b/src/HttpBaseTest.php
similarity index 70%
rename from src/HttpAdapterTest.php
rename to src/HttpBaseTest.php
index d192869..55e5262 100644
--- a/src/HttpAdapterTest.php
+++ b/src/HttpBaseTest.php
@@ -9,21 +9,14 @@
  * file that was distributed with this source code.
  */
 
-namespace Http\Adapter\Tests;
+namespace Http\Client\Tests;
 
-use Http\Client\HttpClient;
-use Http\Client\Exception\RequestException;
-use Http\Client\Exception\BatchException;
-use Http\Message\MessageFactory;
 use Http\Discovery\MessageFactoryDiscovery;
+use Http\Message\MessageFactory;
 use Nerd\CartesianProduct\CartesianProduct;
-use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 
-/**
- * @author GeLo <geloen.eric@gmail.com>
- */
-abstract class HttpAdapterTest extends \PHPUnit_Framework_TestCase
+abstract class HttpBaseTest extends \PHPUnit_Framework_TestCase
 {
     /**
      * @var string
@@ -35,11 +28,6 @@ abstract class HttpAdapterTest extends \PHPUnit_Framework_TestCase
      */
     protected static $messageFactory;
 
-    /**
-     * @var HttpClient
-     */
-    protected $httpAdapter;
-
     /**
      * @var array
      */
@@ -79,107 +67,6 @@ public static function tearDownAfterClass()
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    protected function setUp()
-    {
-        $this->httpAdapter = $this->createHttpAdapter();
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    protected function tearDown()
-    {
-        unset($this->httpAdapter);
-    }
-
-    /**
-     * @return HttpClient
-     */
-    abstract protected function createHttpAdapter();
-
-    /**
-     * @dataProvider requestProvider
-     * @group        integration
-     */
-    public function testSendRequest($method, $uri, array $headers, $body)
-    {
-        if ($body != null) {
-            $headers['Content-Length'] = (string)strlen($body);
-        }
-
-        $request = self::$messageFactory->createRequest(
-            $method,
-            $uri,
-            $headers,
-            $body,
-            '1.1'
-        );
-
-        $response = $this->httpAdapter->sendRequest($request);
-
-        $this->assertResponse(
-            $response,
-            [
-                'body' => $method === 'HEAD' ? null : 'Ok',
-            ]
-        );
-        $this->assertRequest($method, $headers, $body, '1.1');
-    }
-
-    /**
-     * @dataProvider requestWithOutcomeProvider
-     * @group        integration
-     */
-    public function testSendRequestWithOutcome($uriAndOutcome, $protocolVersion, array $headers, $body)
-    {
-        if ($protocolVersion === '1.0') {
-            $body = null;
-        }
-
-        if ($body != null) {
-            $headers['Content-Length'] = (string)strlen($body);
-        }
-
-        $request = self::$messageFactory->createRequest(
-            $method = 'GET',
-            $uriAndOutcome[0],
-            $headers,
-            $body,
-            $protocolVersion
-        );
-
-        $response = $this->httpAdapter->sendRequest($request);
-
-        $outcome = $uriAndOutcome[1];
-        $outcome['protocolVersion'] = $protocolVersion;
-
-        $this->assertResponse(
-            $response,
-            $outcome
-        );
-        $this->assertRequest($method, $headers, $body, $protocolVersion);
-    }
-
-    /**
-     * @expectedException \Http\Client\Exception
-     * @group             integration
-     */
-    public function testSendWithInvalidUri()
-    {
-        $request = self::$messageFactory->createRequest(
-            'GET',
-            $this->getInvalidUri(),
-            $this->defaultHeaders,
-            null,
-            '1.1'
-        );
-
-        $this->httpAdapter->sendRequest($request);
-    }
-
     /**
      * @return array
      */
@@ -235,7 +122,7 @@ private function getMethods()
      *
      * @return string|null
      */
-    private function getUri(array $query = [])
+    protected function getUri(array $query = [])
     {
         return !empty($query)
             ? PHPUnitUtility::getUri().'?'.http_build_query($query, null, '&')
@@ -245,7 +132,7 @@ private function getUri(array $query = [])
     /**
      * @return string
      */
-    private function getInvalidUri()
+    protected function getInvalidUri()
     {
         return 'http://invalid.php-http.org';
     }
@@ -390,7 +277,7 @@ protected function assertRequest(
     /**
      * @return array
      */
-    private function getRequest()
+    protected function getRequest()
     {
         $file = fopen(self::$logPath, 'r');
         flock($file, LOCK_EX);
diff --git a/src/HttpClientTest.php b/src/HttpClientTest.php
new file mode 100644
index 0000000..c1d0e8b
--- /dev/null
+++ b/src/HttpClientTest.php
@@ -0,0 +1,123 @@
+<?php
+
+/*
+ * This file is part of the Http Adapter package.
+ *
+ * (c) Eric GELOEN <geloen.eric@gmail.com>
+ *
+ * For the full copyright and license information, please read the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Http\Client\Tests;
+
+use Http\Client\HttpClient;
+
+/**
+ * @author GeLo <geloen.eric@gmail.com>
+ */
+abstract class HttpClientTest extends HttpBaseTest
+{
+    /**
+     * @var HttpClient
+     */
+    protected $httpAdapter;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp()
+    {
+        $this->httpAdapter = $this->createHttpAdapter();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function tearDown()
+    {
+        unset($this->httpAdapter);
+    }
+
+    /**
+     * @return HttpClient
+     */
+    abstract protected function createHttpAdapter();
+
+    /**
+     * @dataProvider requestProvider
+     * @group        integration
+     */
+    public function testSendRequest($method, $uri, array $headers, $body)
+    {
+        if ($body != null) {
+            $headers['Content-Length'] = (string)strlen($body);
+        }
+
+        $request = self::$messageFactory->createRequest(
+            $method,
+            $uri,
+            $headers,
+            $body
+        );
+
+        $response = $this->httpAdapter->sendRequest($request);
+
+        $this->assertResponse(
+            $response,
+            [
+                'body' => $method === 'HEAD' ? null : 'Ok',
+            ]
+        );
+        $this->assertRequest($method, $headers, $body, '1.1');
+    }
+
+    /**
+     * @dataProvider requestWithOutcomeProvider
+     * @group        integration
+     */
+    public function testSendRequestWithOutcome($uriAndOutcome, $protocolVersion, array $headers, $body)
+    {
+        if ($protocolVersion === '1.0') {
+            $body = null;
+        }
+
+        if ($body != null) {
+            $headers['Content-Length'] = (string)strlen($body);
+        }
+
+        $request = self::$messageFactory->createRequest(
+            $method = 'GET',
+            $uriAndOutcome[0],
+            $headers,
+            $body,
+            $protocolVersion
+        );
+
+        $response = $this->httpAdapter->sendRequest($request);
+
+        $outcome = $uriAndOutcome[1];
+        $outcome['protocolVersion'] = $protocolVersion;
+
+        $this->assertResponse(
+            $response,
+            $outcome
+        );
+        $this->assertRequest($method, $headers, $body, $protocolVersion);
+    }
+
+    /**
+     * @expectedException \Http\Client\Exception
+     * @group             integration
+     */
+    public function testSendWithInvalidUri()
+    {
+        $request = self::$messageFactory->createRequest(
+            'GET',
+            $this->getInvalidUri(),
+            $this->defaultHeaders
+        );
+
+        $this->httpAdapter->sendRequest($request);
+    }
+}
diff --git a/src/PHPUnitUtility.php b/src/PHPUnitUtility.php
index 53fefce..2f12ef2 100644
--- a/src/PHPUnitUtility.php
+++ b/src/PHPUnitUtility.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Http\Adapter\Tests;
+namespace Http\Client\Tests;
 
 /**
  * PHPUnit utility.