EDIT

        assertEquals("incorrect number of single reads", 0, dnaSample.getAmplificationResults().iterator().next().getSingleReads().size());

        assertEquals("incorrect number of single reads", 0, consensusSequence.getSingleReads().size());

        deleteResult = occurrenceService.deleteDerivateHierarchy(consensusSequence, config);

        assertTrue(deleteResult.toString(), deleteResult.isOk());

        assertEquals("number of sequences incorrect", 0, dnaSample.getSequences().size());