Represent boolean values.
Inheritance: extends eZ\Publish\Core\FieldType\FieldType
 /**
  * Returns the field type under test.
  *
  * This method is used by all test cases to retrieve the field type under
  * test. Just create the FieldType instance using mocks from the provided
  * get*Mock() methods and/or custom get*Mock() implementations. You MUST
  * NOT take care for test case wide caching of the field type, just return
  * a new instance from this method!
  *
  * @return \eZ\Publish\SPI\FieldType\FieldType
  */
 protected function createFieldTypeUnderTest()
 {
     $fieldType = new Checkbox();
     $fieldType->setTransformationProcessor($this->getTransformationProcessorMock());
     return $fieldType;
 }
 /**
  * Get handler with required custom field types registered
  *
  * @return Handler
  */
 public function getCustomHandler()
 {
     $fieldType = new FieldType\Checkbox\Type();
     $fieldType->setTransformationProcessor($this->getTransformationProcessor());
     return $this->getHandler('ezboolean', $fieldType, new Legacy\Content\FieldValue\Converter\Checkbox(), new FieldType\NullStorage());
 }