Avoid mocking several interfaces

It is a code smell, but I am not sure it makes sense to introduce a
public interface for this.

Tests/RegistryTest.php

@@ -13,6 +13,10 @@
 use ProxyManager\Proxy\ProxyInterface;
 use stdClass;
 
+interface LazyLoadingEntityManagerInterface extends LazyLoadingInterface, EntityManagerInterface
+{
+}
+
 class RegistryTest extends TestCase
 {
     public function testGetDefaultConnectionName() : void
@@ -139,7 +143,7 @@ public function testReset() : void
         $noProxyManager->expects($this->once())
             ->method('clear');
 
-        $proxyManager = $this->getMockBuilder([LazyLoadingInterface::class, EntityManagerInterface::class])->getMock();
+        $proxyManager = $this->createMock(LazyLoadingEntityManagerInterface::class);
         $proxyManager->expects($this->once())
             ->method('setProxyInitializer')
             ->with($this->isInstanceOf(Closure::class));