// Initially null for non-zero id
        assertNull(item.getNewInputs());

        // Set new inputs
        String[] newInputs = { "new1", "new2" };
        item.setNewInputs(newInputs);
        assertNotNull(item.getNewInputs());
        assertEquals(2, item.getNewInputs().length);
        assertEquals("new1", item.getNewInputs()[0]);
        assertEquals("new2", item.getNewInputs()[1]);
    }

                        // update
                        writer.write(item.toLineString());
                        writer.write(Constants.LINE_SEPARATOR);
                        return new CharMappingItem(item.getId(), item.getNewInputs(), item.getNewOutput());
                    }
                    return null;
                } finally {
                    item.setNewInputs(null);
                    item.setNewOutput(null);

                        // update
                        writer.write(item.toLineString());
                        writer.write(Constants.LINE_SEPARATOR);
                        return new SynonymItem(item.getId(), item.getNewInputs(), item.getNewOutputs());
                    }
                    return null;
                } finally {
                    item.setNewInputs(null);
                    item.setNewOutputs(null);