Fix the Mock strategy to work for async clients too

Author: Jean85

spec/Strategy/MockClientStrategySpec.php

@@ -2,6 +2,7 @@
 
 namespace spec\Http\Discovery\Strategy;
 
+use Http\Client\HttpAsyncClient;
 use Http\Client\HttpClient;
 use Http\Discovery\ClassDiscovery;
 use Http\Discovery\Strategy\DiscoveryStrategy;
@@ -22,4 +23,11 @@ function it_should_return_the_mock_client(DiscoveryStrategy $strategy)
         $candidates->shouldBeArray();
         $candidates->shouldHaveCount(1);
     }
+
+    function it_should_return_the_mock_client_as_async(DiscoveryStrategy $strategy)
+    {
+        $candidates = $this->getCandidates(HttpAsyncClient::class);
+        $candidates->shouldBeArray();
+        $candidates->shouldHaveCount(1);
+    }
 }

src/Strategy/MockClientStrategy.php

@@ -2,6 +2,7 @@
 
 namespace Http\Discovery\Strategy;
 
+use Http\Client\HttpAsyncClient;
 use Http\Client\HttpClient;
 use Http\Mock\Client as Mock;
 
@@ -17,8 +18,11 @@ final class MockClientStrategy implements DiscoveryStrategy
      */
     public static function getCandidates($type)
     {
-        return (HttpClient::class === $type)
-            ? [['class' => Mock::class, 'condition' => Mock::class]]
-            : [];
+        switch ($type) {
+            case HttpClient::class:
+            case HttpAsyncClient::class:
+                return [['class' => Mock::class, 'condition' => Mock::class]];
+            default:
+                return [];
     }
 }