JUnit Test Lab

You will be creating a JUnit Test Class for Gradebook.java, that has been provided for you.  

1. Add a getScoreSize() method to the Gradebook class which returns scoresSize;
2. Add a toString() method to the Gradebook class that returns a string with each score in scores separated by a space.

Create the Test Class GradebookTest.

1. Select the setUp and tearDown method.
2. Select all of the methods of Gradebook, except for the constructor to create tests for.
3. In the setUp method of GradebookTest, create at least two objects of Gradebook of size 5. Call the addScore method for each of the Gradebook classes at least twice (but no more than 5 times).
4. In the teardown method of GradebookTest, set the two objects of Gradebook to null;
5. Create test for the methods of Gradebook:
6. addScore
7. Use the toString method to compare the contents of what is in the scores array vs. what is expected to be in the scores array

assertTrue( . . .)

1. Compare the scoreSize to the expected number of scores entered.

assertEquals(. . .)

1. sum
2. Compare what is returned by sum() to the expected sum of the scores entered.
3. minimum
4. Compare what is returned by minimum() to the expected minimum of the scores entered.
5. finalScore
6. Compare what is returned by finalScore() to the expected finalscore of the scores entered.

The finalScore is the sum of the scores, with the lowest score dropped if there are at least two scores, or 0 if there are no scores.

Upload the following in a .zip file:

1. GradeBook.java
2. GradeBookTest.java

Example:

As a private member of GradeBookTest:

GradeBook g1;

In setup:

g1 = new GradeBook(5);

g1.addScore(50);

g1.addScore(75);

In teardown:

g1 = null;

in testSum():

assertEquals(125, g1.sum(), .0001);

in testMinimum():

assertEquals(50, g1.minimum(), .001);

in addScoreTest();

assertTrue(g1.toString().equals("50.0 75.0 ");

assertEquals(2,g1.getScoreSize());

gi.addScore(89);

assertTrue(g1.toString().equals("50.0 75.0 89.0 ");

assertEquals(3,g1.getScoreSize());

import java.util.ArrayList;

public class GradeBook
{
   private double[] scores;
   private int scoresSize;

   /**
      Constructs a gradebook with no scores and a given capacity.
      @capacity the maximum number of scores in this gradebook
   */
   public GradeBook(int capacity)
   {
      scores = new double[capacity];
      scoresSize = 0;
   }

   /**
      Adds a score to this gradebook.
      @param score the score to add
      @return true if the score was added, false if the gradebook is full
   */
   public boolean addScore(double score)
   {
      if (scoresSize < scores.length)
      {
         scores[scoresSize] = score;
         scoresSize++;
         return true;
      }
      else
         return false;      
   }

   /**
      Computes the sum of the scores in this gradebook.
      @return the sum of the scores
   */
   public double sum()
   {
      double total = 0;
      for (int i = 0; i < scoresSize; i++)
      {
         total = total + scores[i];
      }
      return total;
   }
      
   /**
      Gets the minimum score in this gradebook.
      @return the minimum score, or 0 if there are no scores.
   */
   public double minimum()
   {
      if (scoresSize == 0) return 0;
      double smallest = scores[0];
      for (int i = 1; i < scoresSize; i++)
      {
         if (scores[i] < smallest)
         {
            smallest = scores[i];
         }
      }
      return smallest;
   }

   /**
      Gets the final score for this gradebook.
      @return the sum of the scores, with the lowest score dropped if 
      there are at least two scores, or 0 if there are no scores.
   */
   public double finalScore() 
   {
      if (scoresSize == 0)
         return 0;
      else if (scoresSize == 1)
         return scores[0];
      else
         return sum() - minimum();
   }
}