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Testing in Python: Unit Tests

Flow graph analysis (CFG)

Check User Input Graph

CheckUserInput

Add Graph

Add

Subtract Graph

Subtract

Multiply Graph

Multiply

Divide Graph

Divide

Calculate Graph

Calculate

isExit Graph

isExit

The Independent Paths

Check User Input Paths

Independent Paths Inputs Output Visibility Type
Start => input == "" ? True => print("input cant be empty" ) => raise valueError => End input = '' ValueError Visible
Start => input == "" ? False => try => val = int(input) => return val => End input = '1' 1 Visible
Start => input == "" ? False => try => catch ValueError => try => val = float(input) => return val => End input = '1.1' 1.1 Visible
Start => input == "" ? False => try => catch ValueError => try => Catch ValueError => print(input is not number) => raise ValueError => End input = 'x' ValueError Visible

Add Paths

Independent Paths Inputs Output Visibility Type
Start => result = x + y => return result => End x = 1 , y = 2 result = 3 Visible

Subtract Paths

Independent Paths Inputs Output Visibility Type
Start => result = x - y => return result => End x = 3 , y = 2 result = 1 Visible

Multiply Paths

Independent Paths Inputs Output Visibility Type
Start => result = x * y => return result => End x = 3 , y = 2 result = 6 Visible

Divide Paths

Independent Paths Inputs Output Visibility Type
Start => y == 0 ? True => print("you can't divide by zero!") => raise ZeroDivisionError => End x = 1 , y = 0 ZeroDivisionError Visible
Start => y == 0 ? False => x == 0 ? True => return 0 => End x = 0 , y = 1 0 Visible
Start => y == 0 ? False => x == 0 ? False => result = x/y => return result => End x = 6 , y = 2 result = 3 Visible

Calculate Paths

Independent Paths Inputs Output Visibility Type
Start => not num1 or not num2 ? True => print("inputs can not be null") => raise ValueError => End num1 = None, num2 = None, choice = 1 ValueError Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) False => raise exception => End num1 = 1, num2 = 1, choice = 5 Exception Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? True => result = add(num1,num2) => return result => End num1 = 1, num2 = 2, choice = 1 result = 3 Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? False => choice =="2" ? True => result = subtract(num1,num2) => return result => End num1 = 3, num2 = 2, choice = 2 result = 1 Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? False => choice =="2" ? False => choice =="3" ? True => result = muliply(num1,num2) => return result => End num1 = 2, num2 = 3, choice = 3 result = 6 Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? False => choice =="2" ? False => choice =="3" ? False=> choice =="4" ? True => num2==0 ? False => result = divide(num1,num2) => return result => End num1 = 6, num2 = 2, choice = 4 result = 3 Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? False => choice =="2" ? False => choice =="3" ? False=> choice =="4" ? True => num2==0 ? True => print ("You can't divide by zero!") => raise ZeroDivisionError => End num1 = 1, num2 = '0', choice = 4 ZeroDivisionError Visible
Start => not num1 or not num2 ? False => num1= check_user_input(num1) => num2 = check_user_input(num2) => result = "" => choice in (1,2,3,4) True => choice =="1" ? False => choice =="2" ? False => choice =="3" ? False=> choice =="4" ? True => num2==0 ? True => print ("You can't divide by zero!") => raise ZeroDivisionError => End num1 = 1, num2 = 0, choice = 4 ZeroDivisionError Invisible

isExit Paths

Independent Paths Inputs Output Visibility Type
Start => next_calculation == "no" ? True => return true => End next_calculation = "no" True Visible
Start => next_calculation == "no" ? False => next_calculation == "yes" ? True => return false => End next_calculation = "yes" False Visible
Start => next_calculation == "no" ? False => next_calculation == "yes" ? False => raise ValueError => End next_calculation = "Yes" ValueError Visible

The minimal number of paths that achieve 100% code statement coverage is 20

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