protected function createQuestionnaire()
 {
     $person = new Person();
     $person->setSignedUp(true)->getAddress()->setPostcode('11AA 2BB');
     $questionnaire = (new Questionnaire($person))->setCompletedDate(new \DateTime());
     return $questionnaire;
 }
 public function testGetSetSignedUp()
 {
     $this->assertFalse($this->instance->isSignedUp());
     $this->assertInstanceOf(Person::class, $this->instance->setSignedUp(true));
     $this->assertTrue($this->instance->isSignedUp());
 }