Question

You will be creating a JUnit Test Class for Gradebook.java, (listing 1.1) and you can download it from blackboard.

Gradebook has two attributes: an array of int called scores to hold scores and scoreSize that indicates how many scores are currently held in the array. This field is initially set to 0.

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

.
Task #2: Create the Test Class GradebookTester by right clicking on the GradeBook.java, select New, Junit Test Case.
Using the wizard:
Select the setUp and tearDown method check boxes and click Next.
Select all of the methods of Gradebook, except for the constructor to create tests for. Then click finish.

.
Task #3:
In the setUp method of GradebookTester, create at least two objects of Gradebook to hold 5 scores. Then call the addScore method for each of the Gradebook objects at least twice (but no more than 5 times) to add some random scores of your choice to the GradeBook objects
In the teardown method of GradebookTester, set the two objects of Gradebook to null.

Task #4: Create test for the methods of Gradebook:
addScore
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( . . .)
Compare the scoreSize to the expected number of scores entered, using assertEquals(. . .)
sum
Compare what is returned by sum() to the expected sum of the scores entered.
minimum
Compare what is returned by minimum() to the expected minimum of the scores entered.
finalScore
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.

Task #5: Upload both files to GitHub in a directory named CMSC203_Lab6.

Example:

As a private attribute (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 ”);

Listing 1.1 – GradeBook.java

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();
}
}

Answer 1

PLEASE GIVE IT A THUMBS UP, I SERIOUSLY NEED ONE, IF YOU NEED ANY MODIFICATION THEN LET ME KNOW, I WILL DO IT FOR YOU

GradeBook.java

//Import required header files

import java.util.ArrayList;

//Declare the class GradeBook

class GradeBook {
  //Declare the local variables

  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();
  }

  //Implement the method to return the scores size

  public int getScoreSize() {
    return scoresSize;
  }

  //Implement the method toString()

  public String toString() {
    String result = "";

    for (int i = 0; i < scoresSize; i++) {
      result += scores[i] + " ";
    }

    return result;
  }
}

GradeBookTester.java

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

//Define the testclass

class GradeBookTester {
  //Create ibject for the class

  GradeBook g1;

  @Before
  //Implement the steUp method

  public void setUp() throws Exception {
    g1 = new GradeBook(5);

    g1.addScore(50.0);

    g1.addScore(75.0);
  }

  //Implement the tearDown method

  @After
  public void tearDown() throws Exception {
    g1 = null;
  }

  //Implement the testAddScore Method

  @Test
  public void testAddScore() {
    assertEquals(2.0, g1.getScoreSize(), 0.01);

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

  //Implemenet the testSum method

  @Test
  public void testSum() {
    assertEquals(125, g1.sum(), .0001);
  }

  //Implement the testMinimum method

  @Test
  public void testMinimum() {
    assertEquals(50.0, g1.minimum(), .0001);
  }

  //Implement the testFinalScore method

  @Test
  public void testFinalScore() {
    assertEquals(75.0, g1.finalScore(), .0001);
  }
}