/**
  * @param null|bool|string $format
  * @param string           $output
  * @dataProvider dateFilterFormatProvider
  */
 public function testDateFilterFormat($format, $output)
 {
     // Since model is instantiated in setup, if I use it directly in the dataProvider, it will be null.
     // I use this value to indicate the model is to be used for output
     if (self::MODEL == $output) {
         $output = $this->_model;
     }
     if (is_null($format)) {
         $this->_localeMock->expects($this->once())->method('getDateFormat')->with($this->equalTo(\Magento\Framework\Stdlib\DateTime\TimezoneInterface::FORMAT_TYPE_SHORT))->will($this->returnValue($output));
     }
     $actual = $this->_model->dateFilterFormat($format);
     $this->assertEquals($output, $actual);
 }