20.1 Junit Exercise 1

import java.util.LinkedList;

import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

//default runner.
@RunWith(JUnit4.class)
public class LinkedListTest {

    private LinkedList<String> testSubject;

//TODO 1: Write a public void method (you can choose the name but setup is a 
//nice one) and annotate it with @Before. In that method instantiate your 
//LinkedList<String> and store the reference in the field called testSubject.

    @Before
    public void setup() {
        testSubject = new LinkedList<String>();
    }

//TODO 2: Test that when you call the method testSubject.add("one") you 
//get the boolean true returned.

    @Test
    public void testAddOne() {
        boolean expected = true;
        boolean actual = testSubject.add("one");
        assertEquals(expected, actual);
    }
//After doing TODO 2, save the document and go back to the manual to get 
//directions to run the test. You will see if what you have so far works. 
//Small steps are always better!

//TODO 3(bonus): Test that when you call testSubject.add("one"), 
//testSubject.add("two"), testSubject.add("three") and then call 
//testSubject.getLast(), you get the third string that was added.

    @Test
    public void testAddThreeStringsAndCallGetLast() {
        String expected = "three";
        testSubject.add("one");
        testSubject.add("two");
        testSubject.add("three");

        String actual = testSubject.getLast();
        assertTrue(actual == expected);

        actual = testSubject.getFirst();
        assertTrue(actual == "one");
    }

//TODO 4(bonus): Test that when you call testSubject.add("one"), 
//testSubject.add("two"), and then call testSubject.add(1, "three"), 
//if you call testSubject.get(1) you get "three".

    @Test
    public void testAddWithTwoParameters() {
        String expected = "three";
        testSubject.add("one");
        testSubject.add("two");
        testSubject.add(1, "three");

        String actual = testSubject.get(1);
        assertEquals(expected, actual);
    }

//TODO 5(bonus): Test that when you call testSubject.add(index, myString) 
//and index is a negative integer you get an IndexOutOfBoundsException.

    @Test(expected = IndexOutOfBoundsException.class)
    public void testAddWithNegativeIndex() {
        testSubject.add(-1, "one");
    }

//TODO 6: Test that when you call testSubject.add(index, "myString") and index
//is an integer larger than testSubject.size() you get an IndexOutOfBoundsException.

    @Test(expected = IndexOutOfBoundsException.class)
    public void testAddWithLargerThanMaxIndex() {
        testSubject.add("one");
        testSubject.add("two");
        testSubject.add(testSubject.size() + 1, "three");
    }
}