@RunWith(SpringRunner.class)
@JdbcTest
@AutoConfigureTestDatabase(replace= AutoConfigureTestDatabase.Replace.NONE)
@Sql( ... schema creation, sample data, etc  )
@ContextConfiguration(classes = ... dao and service classes used in the test)

// <editor-fold name='connection leaking fix'
@Autowired
private DataSource dataSource;
private static HikariDataSource hikariDataSource;

@Before
public void saveDataSource() {
    this.hikariDataSource = (HikariDataSource)dataSource;
}

@AfterClass
public static void releaseDataSource() {
    if (hikariDataSource != null) {
        hikariDataSource.close();
    }
}
// </editor-fold>