public function testInterfaceMethods()
 {
     $instance = new NullCallbackLoader();
     $this->assertNull($instance->load('Foo'));
     $this->assertNull($instance->singleton('Foo'));
     $this->assertNull($instance->registerExpectedReturnType('Foo', 'bar'));
     $this->assertNull($instance->registerCallback('Foo', function () {
     }));
 }
 public function testInterfaceMethods()
 {
     $instance = new NullCallbackLoader();
     $this->assertNull($instance->load('Foo'));
     $this->assertNull($instance->create('Foo'));
     $this->assertNull($instance->singleton('Foo'));
     $this->assertNull($instance->registerExpectedReturnType('Foo', 'bar'));
     $this->assertNull($instance->registerCallback('Foo', function () {
     }));
     $callbackContainer = $this->getMockBuilder('\\Onoi\\CallbackContainer\\CallbackContainer')->disableOriginalConstructor()->getMock();
     $this->assertNull($instance->registerCallbackContainer($callbackContainer));
 }