Data validation rules in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks if the data entered into a form meets the required validation rules. It verifies that invalid data is rejected and valid data is accepted.

Test Code - PyTest

Testing Fundamentals

def validate_age(age):
    if not isinstance(age, int):
        return False
    if age < 0 or age > 120:
        return False
    return True


def test_validate_age():
    assert validate_age(25) == True
    assert validate_age(-1) == False
    assert validate_age(130) == False
    assert validate_age('twenty') == False
    assert validate_age(0) == True
    assert validate_age(120) == True

if __name__ == '__main__':
    test_validate_age()

Execution Trace - 14 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment ready, validate_age function loaded	-	PASS
2	Call validate_age(25)	Function receives integer 25	Check if 25 is valid age (0 <= 25 <= 120)	PASS
3	Assert validate_age(25) == True	Function returned True	Age 25 is valid	PASS
4	Call validate_age(-1)	Function receives integer -1	Check if -1 is valid age (0 <= -1 <= 120)	PASS
5	Assert validate_age(-1) == False	Function returned False	Age -1 is invalid	PASS
6	Call validate_age(130)	Function receives integer 130	Check if 130 is valid age (0 <= 130 <= 120)	PASS
7	Assert validate_age(130) == False	Function returned False	Age 130 is invalid	PASS
8	Call validate_age('twenty')	Function receives string 'twenty'	Check if input is integer	PASS
9	Assert validate_age('twenty') == False	Function returned False	Non-integer input is invalid	PASS
10	Call validate_age(0)	Function receives integer 0	Check if 0 is valid age (0 <= 0 <= 120)	PASS
11	Assert validate_age(0) == True	Function returned True	Age 0 is valid	PASS
12	Call validate_age(120)	Function receives integer 120	Check if 120 is valid age (0 <= 120 <= 120)	PASS
13	Assert validate_age(120) == True	Function returned True	Age 120 is valid	PASS
14	Test ends	All assertions passed	-	PASS

Failure Scenario

Failing Condition: Function returns True for invalid age like -1 or string input

Execution Trace Quiz - 3 Questions

What does the test check when calling validate_age(-1)?

A That the function accepts strings

B That negative ages are valid

C That negative ages are invalid

D That age 0 is invalid

Key Result

Always test boundary values and invalid data types to ensure data validation rules work correctly.