private function setMockFieldsService()
{
$mockFieldsService = $this->getMockBuilder(FieldsService::class)->disableOriginalConstructor()->getMock();
$mockFieldsService->expects($this->any())->method('getLayoutById')->with($this->isType('integer'))->willReturn($this->getMockFieldLayout());
$this->setComponent(Craft::app(), 'fields', $mockFieldsService);
return $mockFieldsService;
}