Question

This is a program and my solution. How many times should I test, if I need full coverage of all possible program flows?  Why?

Write a program that prompts the user for a grade (0-100) and, whether the student is a graduate student (Y/N).

• If the student is a graduate student, their grade is reduced by 10%, because we have a higher expectation for a graduate students in an undergraduate class.
• The program then computes and prints the letter grade is based on the scale below.
  • 90-100 A
  • 80-89 B
  • 70-79 C
  • 60-69 D
  • 0-60 F
• The program also provides feedback based on the letter grade the student receive.
  • If the letter grade is an A, it will print “Excellent”
  • If the letter grade is a B, it will print “Good Job”
  • If the letter grade is a C, it will print “Good Try”
  • If the letter grade is a D, it will print “ Just Passed”
  • If the letter grade is an F, it will print “Seek Help”
  • Solution:
  • yourgrade = int(input("Enter your grade:"))

  • you=input("graduate student：")
    

    if you=="Y":
    yourgrade=yourgrade*0.9
    
    if yourgrade>89:
    print("You got a A")
    print("Excellent")
    
    elif yourgrade>79:
    print("You got a B")
    print("Good job")
    
    elif yourgrade>69:
    print("You got a C" )
    print("Good try")
    
    elif yourgrade>59:
    print("You got a D")
    print("Just passed")
    
    else:
    print("You got a F")
    print("Seek help")

Answer 1

Coverage: Coverage is the term used to determine which are the paths in the program that are checked in the test.

" To get the full coverage, we need to run at least 6 times for this program"

Reason:

There are 6 paths in your program. That is:

1. if you == 'Y':
2. yourgrade>89
3. yourgrade>79
4. yourgrade>69
5. yourgrade>59
6. else case

Hence, you need at least 6 tests, each for every path.

Example:

1. Graduate Student = 'Y' => checks path1
2. Yourgrade= 86 => checks path2
3. Yourgrade= 73 => checks path3
4. Yourgrade= 68 => checks path4
5. Yourgrade= 52 => checks path5
6. Yourgrade= 40 => checks path6