/**
  * @param string $unit
  * @param mixed $value
  * @return AbstractBonus
  */
 public function toBonus($unit, $value)
 {
     /** @var \Mockery\MockInterface|MeasurementWithBonus $measurement */
     $measurement = \Mockery::mock(MeasurementWithBonus::class);
     $measurement->shouldReceive('getUnit')->andReturn($unit);
     $measurement->shouldReceive('getValue')->andReturn($value);
     return parent::measurementToBonus($measurement);
 }