assertEquals(1, item.getInputs().length);
        assertEquals("input", item.getInputs()[0]);
        assertEquals("output", item.getOutput());
    }

    @Test
    public void test_defensiveCopy_inputs() {
        // Test that getInputs() returns defensive copy
        String[] originalInputs = { "a", "b", "c" };
        CharMappingItem item = new CharMappingItem(1L, originalInputs, "output");