Testing

Before a program is released to a customer, a programmer needs to make sure that it runs correctly. How should this be done? Currently, your technique is to run your program once of twice and make sure it doesn't crash. If you had thousand lines of code, then there is no way that you could claim that the program is perfect after you run it 1 or 2 times. Instead you would need a more _____________ testing technique.

The purpose of testing is to produce a _________________ and ____________________ _______________________. In industry testing is done by _______________________ than those that write the program. It is hard to find errors in your own work.

A good, simple, systematic way to find lots of bugs in your programs is to do _________ and __________________ testing. We test _____________ at a time and make sure each one works before moving on.

Black Box Testing

-          look only at the pre and post conditions and not at the code

-          make sure that your test data doesn't break the _______________

-          the test is passed if it meets the ________________.

Test the method by sending in the following kinds of parameters:

Test Type	Description
	normal values that we would use often.
	values that are much larger than usual.
	values that are much smaller than usual. negative number and decimal numbers work well here.
	strange values that people don't normally consider. Some common examples: -1, 0, 1 work well for integers. Numbers at the edge of the pre conditions. The year 2000. Sending all the same values to a function that finds the minimum.

White Box Testing

-          look at the code

-          make sure that you run every line of code at least once

-          test is passed if the _________________

To Test loops:

-          _______________________________

-          _______________________________

-          _______________________________

To Test ifs:

-          __________________________

Create a Test Plan for the Following Program

import java.io.*;import java.math.*;

public class fred

{

public static void main (String args[])

{System.out.println ("The max of 1, 2, and 3 is " + maxof3(1,2,3));

 printstar(9);

 printmultiple(5);

 System.out.println("The cube of 3 is " + cube(3));

 if (greater5(6)) System.out.println ("6 is greater than 5");

 else System.out.println("6 is less than 5");

}

public static int maxof3 (int a, int b, int c)

{ //Pre: none

  //Post: returns the largest of a,

  //      b or c

  if (a>b && a>c)

    return a;

  else if (b>c && b>a)

    return b;

  else

    return c;

}

public static void printstar (int a)

{ //Pre: a is 0 or larger

  //Post: prints out a number of stars

  while (a>0)

  { System.out.println("*");

    a--;

  }

}

public static void printmultiple (int a)

{ //Pre: none

  //Post: prints out result of a X 1,

  //     a X 2, ... a X 10

  int b = 1;

  while (b < 11)

  { System.out.println(a + " X " + b

       + " = " + (a*b));

    b++;

  }

}

public static double cube (double a)

{ //Pre: none

  //Post: returns a*a*a

  return a*a*a;

}

public static boolean greater5 (int a)

{ //Pre: none

  //Post: returns false if a is less

  //  than 5, true otherwise

  if (a>5)

    return true;

  else

    return false;

}

}

Black Box Test Cases

Function	Type	Value of Parameters	Result	Passed?
Maxof3	Average
Maxof3	Large
Maxof3	Small
Maxof3	Boundary
PrintStar	Average
PrintStar	Large
PrintStar	Small
PrintStar	Boundary
PrintMultiple	Average
PrintMultiple	Large
PrintMultiple	Small
PrintMultiple	Boundary
Cube	Average
Cube	Large
Cube	Small
Cube	Boundary
Greater5	Average
Greater5	Large
Greater5	Small
Greater5	Boundary

White Box Test Cases

Maxof3 (If, so test every line)

Line Tested	Parameters	Result	Passed?

PrintStar (Loop)

Loop Test	Parameters	Result	Passed?
Avoid Loop
Loop once
Many times

PrintMultiple (Loop)

Loop Test	Parameters	Result	Passed?
Avoid Loop
Loop once
Many times

Cube (no loop, no if, so just run every line)

Line Tested	Parameters	Result	Passed?

Greater5 (if, so test every line)

Line Tested	Parameters	Result	Passed?