public class IterativeLinkListTest {

    private static final String FRENCH_POSTMALONE = "Zed Yun Pavarotti";
    private static final String WHITE_THUG = "47ter";
    private static final String SAD_RAPPER = "Tsew the Kid";
    private IterativeLinkedList<String> rapperToListen;

    @Before
    public void setUp() {
        this.rapperToListen = new IterativeLinkedList<String>(SAD_RAPPER,
                new IterativeLinkedList<String>(WHITE_THUG,
                        new IterativeLinkedList<String>(FRENCH_POSTMALONE)));
    }

    @Test
    public void onConstruct_nextValue_shouldBeNull() throws Exception {
        IterativeLinkedList<String> nextIsNull = new IterativeLinkedList<String>("alone");
        assertNull(nextIsNull.getNext());
    }

    @Test
    public void onConstruct_nextValue_shouldExist() throws Exception {
        assertNotNull(rapperToListen.getNext());
    }

    @Test
    public void gettingFirstValue_shouldBeEqualsTo_beginningOfList() throws Exception {
        assertEquals(SAD_RAPPER, rapperToListen.first());
    }

    @Test
    public void gettingSecondValue_shouldBeEqualsTo_nextOfList() throws Exception {
        assertEquals(WHITE_THUG, rapperToListen.second());
    }

    @Test
    public void listLenghth_shouldBeEqualsTo_numberOfAllElements() throws Exception {
        assertEquals(3, rapperToListen.size());
    }

    @Test
    public void lastElement_shouldBe_lastAddElementInList() throws Exception {
        assertEquals(FRENCH_POSTMALONE, rapperToListen.last());
    }

    @Test
    public void getArbitraryElement_shouldReturn_valueForIndexInList() throws Exception {
        assertEquals(WHITE_THUG, rapperToListen.get(1));
    }

    @Test
    public void insertElementAtStart_shouldChange_valueForFirstIndex() throws Exception {
        rapperToListen.insertFirst("Dinos");
        assertEquals("Dinos", rapperToListen.first());
        assertEquals(4, rapperToListen.size());
    }

    @Test
    public void insertElementAtEnd_shouldChange_valueForLastIndex() throws Exception {
        rapperToListen.insertLast("Fianso");
        assertEquals("Fianso", rapperToListen.last());
        assertEquals(4, rapperToListen.size());
    }

    @Test
    public void insertElementAtArbitraryIndex_shouldChange_valueForChoosenIndex() throws Exception {
        rapperToListen.insert("Columbine", 1);
        assertEquals("Columbine", rapperToListen.second());
        assertEquals(4, rapperToListen.size());
    }

    @Test
    public void deleteElementByValue_shouldRemove_listElementAtCorrectIndex() throws Exception {
        rapperToListen.delete(SAD_RAPPER);
        assertEquals(WHITE_THUG, rapperToListen.first());
        assertEquals(2, rapperToListen.size());
    }

    @Test
    public void deleteElementByIndex_shouldRemove_listElementAtCorrectIndex() throws Exception {
        rapperToListen.delete(2);
        assertEquals(WHITE_THUG, rapperToListen.last());
        assertEquals(2, rapperToListen.size());
    }
}