Add callable test case

src/json-rpc/tests/RpcServiceClientTest.php

@@ -142,6 +142,29 @@ class RpcServiceClientTest extends TestCase
         $this->assertEquals($uniqid, $ret);
     }
 
+    public function testProxyCallableParameterAndReturnArray()
+    {
+        $container = $this->createContainer();
+        /** @var MockInterface $transporter */
+        $transporter = $container->get(JsonRpcTransporter::class);
+        $transporter->shouldReceive('setLoadBalancer')
+            ->andReturnSelf();
+        $transporter->shouldReceive('send')
+            ->andReturnUsing(function ($data)  {
+                $data = json_decode($data, true);
+                return json_encode([
+                    'id' => $data['id'],
+                    'result' => $data['params'],
+                ]);
+            });
+        $factory = new ProxyFactory();
+        $proxyClass = $factory->createProxy(CalculatorServiceInterface::class);
+        /** @var CalculatorServiceInterface $service */
+        $service = new $proxyClass($container, CalculatorServiceInterface::class, 'jsonrpc');
+        $ret = $service->callable(function () {}, null);
+        $this->assertEquals([[], null], $ret);
+    }
+
     public function testProxyFactoryWithErrorId()
     {
         $container = $this->createContainer();

src/json-rpc/tests/Stub/CalculatorProxyServiceClient.php

@@ -45,4 +45,9 @@ class CalculatorProxyServiceClient extends AbstractProxyService implements Calcu
     {
         return $this->client->__call(__FUNCTION__, func_get_args());
     }
+
+    public function callable(callable $a, ?callable $b): array
+    {
+        return $this->client->__call(__FUNCTION__, func_get_args());
+    }
 }

src/json-rpc/tests/Stub/CalculatorServiceInterface.php

@@ -25,4 +25,6 @@ interface CalculatorServiceInterface
     public function error();
 
     public function getString(): ?string;
+
+    public function callable(callable $a, ?callable $b): array ;
 }