Big Idea 1 · Topic 1.4 · Exercise 2
Boundary Patrol
25 minutes - 4 patrols - LO CRD-2.J
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The same cases as your handout, in the same order.
Scenario 1 · Foundational
A gradebook accepts quiz scores as whole numbers from 0 to 100 and prints a letter grade. The developer tested 85, 92, and 74 - all three produced correct grades - and wants to ship this afternoon.
Extremes named (the minimum and maximum the requirements define, and what is measured):
Test set + expected outcome for each input (at and just beyond the extremes):
Enrichment - the subtler second boundary this scenario hides:
Scenario 2 · Core
A review site lets users rate films from 1 to 5 stars, and the average rating shows on every film's page. The rating box is free-type - users can enter any number. The lead developer says the star range 'is obvious, so nobody will type anything else.'
Extremes named (the minimum and maximum the requirements define, and what is measured):
Test set + expected outcome for each input (at and just beyond the extremes):
Enrichment - the subtler second boundary this scenario hides:
Scenario 3 · Core
A sign-up page requires passwords of 8 to 16 characters. The intern tested 'sunshine12' - ten characters, accepted, works - and marked the story done.
Extremes named (the minimum and maximum the requirements define, and what is measured):
Test set + expected outcome for each input (at and just beyond the extremes):
Enrichment - the subtler second boundary this scenario hides:
Scenario 4 · Challenge
A wellness app logs nightly sleep in whole minutes, from 0 to 1440 (a full day). It stores each night AND a running lifetime total in the same size of numeric storage, and a school pilot will run it for a full semester. The developer tested 420 and 480 minutes - a good night's sleep either way - and both worked.
Extremes named (the minimum and maximum the requirements define, and what is measured):
Test set + expected outcome for each input (at and just beyond the extremes):
Enrichment - the subtler second boundary this scenario hides:
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