import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import java.util.NoSuchElementException;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

public class SimpleLinkedListTest {

    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    @Test
    public void aNewListIsEmpty() {
        SimpleLinkedList<Integer> list = new SimpleLinkedList<>();
        assertThat(list.size(), is(0));
    }

    @Ignore("Remove to run test")
    @Test
    public void canCreateFromArray() {
        Character[] values = new Character[]{'1', '2', '3'};
        SimpleLinkedList<Character> list = new SimpleLinkedList<Character>(values);
        assertThat(list.size(), is(3));
    }

    @Ignore("Remove to run test")
    @Test
    public void popOnEmptyListWillThrow() {
        expectedException.expect(NoSuchElementException.class);
        SimpleLinkedList<String> list = new SimpleLinkedList<String>();
        list.pop();
    }

    @Ignore("Remove to run test")
    @Test
    public void popReturnsLastAddedElement() {
        SimpleLinkedList<Integer> list = new SimpleLinkedList<Integer>();
        list.push(9);
        list.push(8);
        assertThat(list.size(), is(2));
        assertThat(list.pop(), is(8));
        assertThat(list.pop(), is(9));
        assertThat(list.size(), is(0));
    }

    @Ignore("Remove to run test")
    @Test
    public void reverseReversesList() {
        SimpleLinkedList<String> list = new SimpleLinkedList<String>();
        list.push("9");
        list.push("8");
        list.push("7");
        list.push("6");
        list.push("5");
        list.reverse();
        assertThat(list.pop(), is("9"));
        assertThat(list.pop(), is("8"));
        assertThat(list.pop(), is("7"));
        assertThat(list.pop(), is("6"));
        assertThat(list.pop(), is("5"));
    }

    @Ignore("Remove to run test")
    @Test
    public void canReturnListAsArray() {
        SimpleLinkedList<Character> list = new SimpleLinkedList<Character>();
        list.push('9');
        list.push('8');
        list.push('7');
        list.push('6');
        list.push('5');
        Character[] expected = {'5', '6', '7', '8', '9'};
        assertArrayEquals(expected, list.asArray(Character.class));
    }

    @Ignore("Remove to run test")
    @Test
    public void canReturnEmptyListAsEmptyArray() {
        SimpleLinkedList<Object> list = new SimpleLinkedList<Object>();
        Object[] expected = {};
        assertArrayEquals(expected, list.asArray(Object.class));
    }

}