public function testIsRequired()
{
$this->assertFalse($this->object->isRequired());
$this->assertInstanceOf('Gc\\Property\\Model', $this->object->isRequired(true));
$this->assertTrue($this->object->isRequired());
$this->assertInstanceOf('Gc\\Property\\Model', $this->object->isRequired(false));
$this->assertFalse($this->object->isRequired());
}