This is the Java code that I have:

package edu.wit.cs.comp1000;

import java.util.Scanner;

public class PA5b {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

String ch = "";

do {

double avg = getAverage(sc);

System.out.printf("The average is: %.2f%n" , avg);

System.out.println("Do you want to compute another average (y/n)? ");

sc.nextLine();

ch=sc.nextLine();

} while (!ch.equalsIgnoreCase("N"));

}

private static double getAverage(Scanner aSc) {

double sum = 0.00;

double count = 0, num = 0.00;

System.out.println("Enter a stream of non negative numbers (negative number when finished): ");

while (true) {

num = aSc.nextDouble();

if (num < 0)

break;

sum += num;

count++;

}

Float avg = (float) sum / (float) count;

if (count == 0)

return 0.00;

else

return avg;

}

But the JUnit test is all red, here is the JUnit Test code:

package edu.wit.cs.comp1000.tests;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.PrintStream;

import java.security.Permission;

import edu.wit.cs.comp1000.PA5b;

import junit.framework.TestCase;

public class PA5bTestCase extends TestCase {

@SuppressWarnings("serial")

private static class ExitException extends SecurityException {}

private static class NoExitSecurityManager extends SecurityManager

{

@Override

public void checkPermission(Permission perm) {}

@Override

public void checkPermission(Permission perm, Object context) {}

@Override

public void checkExit(int status) { super.checkExit(status); throw new ExitException(); }

}

@Override

protected void setUp() throws Exception

{

super.setUp();

System.setSecurityManager(new NoExitSecurityManager());

}

@Override

protected void tearDown() throws Exception

{

System.setSecurityManager(null);

super.tearDown();

}

private static final String S_NUMS = "Enter a stream of non-negative numbers (negative when finished): ";

private static final String S_AGAIN = "Do you want to compute another average (y/n)? ";

private static final String S_AVG = "The average is: %s%n";

private void _test(String[] values, String[] prompts, String[] results) {

final String input = String.join(" ", values);

final String output = TestSuite.stringOutput(new String[] {

String.join("", prompts) }, (Object[]) results);

final ByteArrayOutputStream outContent = new ByteArrayOutputStream();

System.setIn(new ByteArrayInputStream(input.getBytes()));

System.setOut(new PrintStream(outContent));

try {

PA5b.main(new String[] { "foo" });

} catch (ExitException e) {}

assertEquals(output, outContent.toString());

System.setIn(null);

System.setOut(null);

}

public void testStop() {

_test(new String[] {"-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00"});

_test(new String[] {"-1", "N"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00"});

_test(new String[] {"-1", "y", "-2", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN, S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00", "0.00"});

_test(new String[] {"-1", "y", "-2", "N"}, new String[] {S_NUMS, S_AVG, S_AGAIN, S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00", "0.00"});

_test(new String[] {"-1", "Y", "-2", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN, S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00", "0.00"});

_test(new String[] {"-1", "Y", "-2", "N"}, new String[] {S_NUMS, S_AVG, S_AGAIN, S_NUMS, S_AVG, S_AGAIN}, new String[] {"0.00", "0.00"});

}

public void testIntOne() {

_test(new String[] {"1", "2", "3", "-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"2.00"});

_test(new String[] {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"5.50"});

_test(new String[] {"1", "1", "3", "-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"1.67"});

}

public void testDecOne() {

_test(new String[] {"1.1", "1.9", "3", "-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"2.00"});

_test(new String[] {"1.1", "2.2", "3.3", "-1", "n"}, new String[] {S_NUMS, S_AVG, S_AGAIN}, new String[] {"2.20"});

}

}