Why defect tracking improves quality in Testing Fundamentals - Test Execution Impact

Test Overview

This test simulates a defect tracking process in a software project. It verifies that defects are logged correctly, assigned, fixed, and retested, ensuring quality improvement through systematic tracking.

Test Code - unittest

Testing Fundamentals

class DefectTracker:
    def __init__(self):
        self.defects = []

    def log_defect(self, defect):
        self.defects.append({'defect': defect, 'status': 'open', 'assigned_to': None})

    def assign_defect(self, index, developer):
        self.defects[index]['assigned_to'] = developer

    def fix_defect(self, index):
        if self.defects[index]['status'] == 'open':
            self.defects[index]['status'] = 'fixed'

    def retest_defect(self, index):
        if self.defects[index]['status'] == 'fixed':
            self.defects[index]['status'] = 'closed'

import unittest

class TestDefectTracking(unittest.TestCase):
    def test_defect_lifecycle(self):
        tracker = DefectTracker()
        tracker.log_defect('Login button not working')
        self.assertEqual(len(tracker.defects), 1)
        self.assertEqual(tracker.defects[0]['status'], 'open')

        tracker.assign_defect(0, 'Alice')
        self.assertEqual(tracker.defects[0]['assigned_to'], 'Alice')

        tracker.fix_defect(0)
        self.assertEqual(tracker.defects[0]['status'], 'fixed')

        tracker.retest_defect(0)
        self.assertEqual(tracker.defects[0]['status'], 'closed')

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Create DefectTracker instance	Empty defect list	defects list length is 0	PASS
2	Log a new defect 'Login button not working'	defects list has 1 defect with status 'open' and no assignee	defects list length is 1 and status is 'open'	PASS
3	Assign defect to developer 'Alice'	defect assigned to Alice	assigned_to is 'Alice'	PASS
4	Fix the defect	defect status changed to 'fixed'	status is 'fixed'	PASS
5	Retest the defect	defect status changed to 'closed'	status is 'closed'	PASS

Failure Scenario

Failing Condition: Defect status does not update correctly after fix or retest

Execution Trace Quiz - 3 Questions

What is the first status of a newly logged defect?

A closed

B fixed

C open

D assigned

Key Result

Tracking defects through clear statuses helps teams know what needs fixing and what is done, improving software quality by making the process visible and manageable.