Serialization unit tests

ItemTest.java

public class ItemTest {

    private static ObjectMapper MAPPER = new ObjectMapperFactory().build();
    private Item item = Item.create("AB123_S", "038678561125", false, true, 0, 1);

    @Test
    public void testJsonSerialization() throws IOException {
        String json = MAPPER.writeValueAsString(item);
        assertEquals(jsonFixture("fixtures/Item.json"), json);
    }

    @Test
    public void testJsonDeserialization() throws IOException {
        Item item2 = MAPPER.readValue(
                jsonFixture("fixtures/Item.json"), Item.class);
        assertEquals(item, item2);
    }
}