@Autowired
	@Override
	public void setDataSource(@Qualifier("dataSource") DataSource dataSource) {
		super.setDataSource(dataSource);
	}
This class is used as base class for test case,and it will initialize the DB
related config, like datasource, and it will start a transaction for every
test function, and rollback after the execution.
ngrinder-controller/src/test/java/org/ngrinder/AbstractNGrinderTransactionalTest.java