Allow injection of Guzzle ClientInterface (#118)

* Allow injection of GuzzleClient so that a configured instance (e.g., with verify=false) can be used.

* Apply suggestions from code review

Works for me. :) Thanks.

Co-authored-by: Frederik Schmitt <[email protected]>

---------

Co-authored-by: Frederik Schmitt <[email protected]>

src/Keycloak.php

@@ -20,6 +20,7 @@
 use Fschmtt\Keycloak\Resource\Users;
 use Fschmtt\Keycloak\Serializer\Factory as SerializerFactory;
 use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\ClientInterface;
 
 class Keycloak
 {
@@ -34,8 +35,9 @@ public function __construct(
         private readonly string $username,
         private readonly string $password,
         private readonly TokenStorageInterface $tokenStorage = new InMemory(),
+        ?ClientInterface $guzzleClient = new GuzzleClient(),
     ) {
-        $this->client = new Client($this, new GuzzleClient(), $this->tokenStorage);
+        $this->client = new Client($this, $guzzleClient, $this->tokenStorage);
         $this->propertyFilter = new PropertyFilter($this->version);
         $this->commandExecutor = new CommandExecutor($this->client, $this->propertyFilter);
         $this->queryExecutor = new QueryExecutor($this->client, (new SerializerFactory())->create());