updateItem1.setNewInputs(new String[] { "m", "n" });
        updateItem1.setNewOutput("o");

        // Create another update for the same item
        CharMappingItem updateItem2 = new CharMappingItem(1L, new String[] { "x", "y" }, "z");
        updateItem2.setNewInputs(new String[] { "p", "q" });
        updateItem2.setNewOutput("r");

        // First update should succeed
        charMappingFile.update(updateItem1);

        // Set new output
        item.setNewOutput("newOutput");
        assertEquals("newOutput", item.getNewOutput());
    }

    @Test
    public void test_setNewOutput_withNewline() {
        String[] inputs = { "input" };
        CharMappingItem item = new CharMappingItem(1L, inputs, "output");

        // Test newline replacement in setNewOutput
        item.setNewOutput("line1\nline2\nline3");