@Test
void rollbackShouldDelegate()
{

    UnmanagedTransaction tx = mock( UnmanagedTransaction.class );
    when( tx.rollbackAsync() ).thenReturn( Futures.completedWithNull() );
    InternalRxTransaction rxTx = new InternalRxTransaction( tx );
    Publisher<Void> publisher = rxTx.rollback();
    StepVerifier.create( publisher ).verifyComplete();
    verify( tx ).rollbackAsync();
}