/**
* @covers ::merge
* @dataProvider mergeDataProvider
*/
public function testMerge($data, $data_to_merge, $merged_data)
{
// Set initial data.
$this->config->setData($data);
// Data to merge.
$this->config->merge($data_to_merge);
// Check that data has merged correctly.
$this->assertEquals($merged_data, $this->config->getRawData());
}