public function testFix()
{
$data = "<?php\n\nnamespace 'App';";
$header = '';
$fixedDataExpected = "<?php\n\nnamespace 'App';";
$headerFixer = new HeaderFixer($header);
$fixedData = $headerFixer->fix($data);
$fixedData = $headerFixer->fix($fixedData);
$this->assertEquals($fixedDataExpected, $fixedData);
}