assertTrue(str.contains("output=output"));
        assertTrue(str.contains("newInputs=[x, y]"));
        assertTrue(str.contains("newOutput=newOutput"));
    }

    public void test_toLineString_withoutUpdates() {
        String[] inputs = { "a", "b", "c" };
        CharMappingItem item = new CharMappingItem(1L, inputs, "output");

        assertEquals("a,b,c=>output", item.toLineString());
    }