Waterfall testing model in Testing Fundamentals - Test Execution Trace

Test Overview

This test simulates the Waterfall testing model by verifying that each testing phase completes before the next begins. It checks that requirements are reviewed, design is validated, implementation is tested, and final acceptance is confirmed in order.

Test Code - unittest

Testing Fundamentals

class WaterfallTestingModel:
    def __init__(self):
        self.phases = ["Requirements Review", "Design Validation", "Implementation Testing", "Acceptance Testing"]
        self.current_phase_index = 0

    def complete_phase(self, phase_name):
        if self.current_phase_index < len(self.phases) and self.phases[self.current_phase_index] == phase_name:
            self.current_phase_index += 1
            return True
        else:
            return False

import unittest

class TestWaterfallModel(unittest.TestCase):
    def setUp(self):
        self.model = WaterfallTestingModel()

    def test_phases_in_order(self):
        self.assertTrue(self.model.complete_phase("Requirements Review"))
        self.assertTrue(self.model.complete_phase("Design Validation"))
        self.assertTrue(self.model.complete_phase("Implementation Testing"))
        self.assertTrue(self.model.complete_phase("Acceptance Testing"))

    def test_phases_out_of_order(self):
        self.assertFalse(self.model.complete_phase("Design Validation"))
        self.assertTrue(self.model.complete_phase("Requirements Review"))
        self.assertFalse(self.model.complete_phase("Acceptance Testing"))

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

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Test starts - unittest framework initializes test class and methods	Test environment ready with WaterfallTestingModel instance	-	PASS
2	Calls complete_phase with 'Requirements Review'	Current phase is 'Requirements Review'	Check if phase matches current phase	PASS
3	Calls complete_phase with 'Design Validation'	Current phase is 'Design Validation'	Check if phase matches current phase	PASS
4	Calls complete_phase with 'Implementation Testing'	Current phase is 'Implementation Testing'	Check if phase matches current phase	PASS
5	Calls complete_phase with 'Acceptance Testing'	Current phase is 'Acceptance Testing'	Check if phase matches current phase	PASS
6	Calls complete_phase with 'Design Validation' out of order	Current phase reset to 0 for new test, which is 'Requirements Review'	Check if phase matches current phase	FAIL
7	Calls complete_phase with 'Requirements Review'	Current phase is 'Requirements Review'	Check if phase matches current phase	PASS
8	Calls complete_phase with 'Acceptance Testing' out of order	Current phase is 'Design Validation'	Check if phase matches current phase	FAIL

Failure Scenario

Failing Condition: Trying to complete a testing phase out of the defined order

Execution Trace Quiz - 3 Questions

What does the test verify about the Waterfall testing model?

A Phases can be completed in any order

B Only the last phase is important

C Phases must be completed in order

D Phases can be skipped

Key Result

Always verify that testing phases follow the defined sequence in Waterfall to catch errors early and maintain process discipline.