Fixing failing tests and code style issues.

Author: mxr576

src/Client.php

@@ -51,7 +51,7 @@ public static function createWithConfig(array $config)
      */
     public function sendRequest(RequestInterface $request)
     {
-        $promise = $this->sendAsyncRequest($request);
+        $promise = $this->sendAsyncRequest($request)->wait();
 
         return $promise->wait();
     }

src/Promise.php

@@ -97,7 +97,7 @@ public function wait($unwrap = true)
         $this->promise->wait(false);
 
         if ($unwrap) {
-            if ($this->getState() == self::REJECTED) {
+            if (self::REJECTED == $this->getState()) {
                 return rejection_for($this->exception);
             }
 

tests/PromiseTest.php

@@ -21,6 +21,6 @@ public function testNonDomainExceptionIsHandled()
 
         $guzzlePromise = new Promise($promise, $request->reveal());
 
-        $guzzlePromise->wait();
+        $guzzlePromise->wait()->wait();
     }
 }