// verifying/SimpleJUnit.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Simple use of JUnit to test ArrayList
package verifying;
import java.util.*;
import org.junit.*;
import static org.junit.Assert.*;

// Keeps track of list objects as they are
// created and cleaned up:
class CountedList extends ArrayList<String> {
  private static int counter = 0;
  private int id = counter++;
  public CountedList() {
    System.out.println("CountedList #" + id);
  }
  public int getId() { return id; }
}

public class SimpleJUnit {
  private CountedList list;
  @Before
  public void initialize() {
    list = new CountedList();
    System.out.println("Set up for " + list.getId());
    for(int i = 0; i < 3; i++)
      list.add(Integer.toString(i));
  }
  @After
  public void cleanup() {
    System.out.println("Cleaning up " + list.getId());
  }
  // All tests are marked with the @Test annotation:
  @Test
  public void insert() {
    System.out.println("Running testInsert()");
    assertEquals(list.size(), 3);
    list.add(1, "Insert");
    assertEquals(list.size(), 4);
    assertEquals(list.get(1), "Insert");
  }
  @Test
  public void replace() {
    System.out.println("Running testReplace()");
    assertEquals(list.size(), 3);
    list.set(1, "Replace");
    assertEquals(list.size(), 3);
    assertEquals(list.get(1), "Replace");
  }
  // A helper method to reduce code duplication. As long
  // as it isn't annotated with @Test, it will not
  // be automatically executed by JUnit.
  private
  void compare(ArrayList<String> lst, String[] strs) {
    String[] array = (String[])lst.toArray();
    assertTrue("Arrays not the same length",
      array.length == strs.length);
    for(int i = 0; i < array.length; i++)
      assertEquals(strs[i], array[i]);
  }
  @Test
  public void order() {
    System.out.println("Running testOrder()");
    compare(list, new String[] { "0", "1", "2" });
  }
  @Test
  public void remove() {
    System.out.println("Running testRemove()");
    assertEquals(list.size(), 3);
    list.remove(1);
    assertEquals(list.size(), 2);
    compare(list, new String[] { "0", "2" });
  }
  @Test
  public void addAll() {
    System.out.println("Running testAddAll()");
    list.addAll(Arrays.asList(new String[] {
      "An", "African", "Swallow"}));
    assertEquals(list.size(), 6);
    compare(list, new String[] { "0", "1", "2",
       "An", "African", "Swallow" });
  }
/*  public static void main(String[] args) {
    // Invoke JUnit on the class:
    org.junit.runner.JUnitCore.runClasses(
      SimpleJUnit.class);
  } */
}
/* Output:
CountedList #0
Running testAddAll()
CountedList #1
Running testInsert()
CountedList #2
Running testRemove()
CountedList #3
Running testOrder()
CountedList #4
Running testReplace()
*/