public function testPopulateDataExistingFile()
 {
     $path = __DIR__ . '/bar/';
     mkdir($path);
     $output = array('foo' => 2, 'bar' => 3);
     file_put_contents($path . 'foo.json', json_encode($output));
     $this->config->shouldReceive('getStoragePath')->once()->andReturn($path)->shouldReceive('getOption')->once()->andReturn('foo');
     $this->assertEquals($this->config->populateData(array('foo' => 'something', 'bar' => 'something')), $output);
     unlink($path . 'foo.json');
     rmdir($path);
 }