Plum\Plum\Converter\MappingConverter::addMapping PHP Метод

    public function addMapping($from, $to, $remove = true)
    {
        $this->mappings[] = ['from' => $from, 'to' => $to, 'remove' => $remove];
        return $this;
    }

 /**
  * @test
  * @covers Plum\Plum\Converter\MappingConverter::convert()
  */
 public function convertReturnsItemIfFromAndToAreEmpty()
 {
     $this->converter->addMapping('', '');
     $this->assertSame('foobar', $this->converter->convert('foobar'));
 }