Neos\Flow\Mvc\Controller\Argument::setRequired PHP Method

    public function setRequired($required)
    {
        $this->isRequired = (bool) $required;
        return $this;
    }

 /**
  * @test
  */
 public function setRequiredShouldProvideFluentInterfaceAndReallySetRequiredState()
 {
     $returnedArgument = $this->simpleValueArgument->setRequired(true);
     $this->assertSame($this->simpleValueArgument, $returnedArgument, 'The returned argument is not the original argument.');
     $this->assertTrue($this->simpleValueArgument->isRequired());
 }