public function testResolveId()
 {
     $this->rawLayoutBuilder->add('root', null, 'root')->addAlias('root_alias1', 'root')->addAlias('root_alias2', 'root_alias1');
     $this->assertEquals('root', $this->rawLayoutBuilder->resolveId('root'));
     $this->assertEquals('root', $this->rawLayoutBuilder->resolveId('root_alias1'));
     $this->assertEquals('root', $this->rawLayoutBuilder->resolveId('root_alias2'));
 }