Defect metrics in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks if the defect metrics calculation feature correctly counts and reports the number of defects found during testing. It verifies that the system accurately tracks defects by severity and status.

Test Code - unittest

Testing Fundamentals

import unittest

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

    def add_defect(self, defect):
        self.defects.append(defect)

    def count_defects(self, severity=None, status=None):
        return len([
            d for d in self.defects
            if (severity is None or d['severity'] == severity) and
               (status is None or d['status'] == status)
        ])

class TestDefectMetrics(unittest.TestCase):
    def setUp(self):
        self.metrics = DefectMetrics()
        self.metrics.add_defect({'id': 1, 'severity': 'High', 'status': 'Open'})
        self.metrics.add_defect({'id': 2, 'severity': 'Low', 'status': 'Closed'})
        self.metrics.add_defect({'id': 3, 'severity': 'Medium', 'status': 'Open'})

    def test_count_all_defects(self):
        total = self.metrics.count_defects()
        self.assertEqual(total, 3)

    def test_count_open_defects(self):
        open_defects = self.metrics.count_defects(status='Open')
        self.assertEqual(open_defects, 2)

    def test_count_high_severity_defects(self):
        high_severity = self.metrics.count_defects(severity='High')
        self.assertEqual(high_severity, 1)

if __name__ == '__main__':
    unittest.main()

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts - unittest framework initializes TestDefectMetrics	Test environment ready with DefectMetrics class and test data	-	PASS
2	setUp method runs - adds three defects with different severities and statuses	DefectMetrics instance contains 3 defects: High/Open, Low/Closed, Medium/Open	-	PASS
3	test_count_all_defects runs - counts all defects without filters	Counting defects in DefectMetrics	Assert total defects count equals 3	PASS
4	test_count_open_defects runs - counts defects with status 'Open'	Counting defects with status 'Open'	Assert open defects count equals 2	PASS
5	test_count_high_severity_defects runs - counts defects with severity 'High'	Counting defects with severity 'High'	Assert high severity defects count equals 1	PASS
6	All tests complete	All assertions passed, test suite finished successfully	-	PASS

Failure Scenario

Failing Condition: The count_defects method returns incorrect counts due to filtering logic error

Execution Trace Quiz - 3 Questions

What does the test_count_open_defects verify?

A It verifies the number of defects with status 'Open' is counted correctly

B It verifies the total number of defects regardless of status

C It verifies the number of defects with severity 'High'

D It verifies the defects are added to the list

Key Result

Always verify that your filtering logic in defect metrics calculations correctly matches the criteria to avoid incorrect defect counts.