Catch a bug before the happy-path demo
Write tests that distinguish missing, invalid and valid input.
Start or resume with saved notes →Situation
The Builder · fictional example
The situation
The Builder's cost calculator shows 0 when the amount field is blank. The demo worked with 20, but a user now believes an empty quote is free.
Before you continue
What would you predict? Say it aloud or write a line on paper. Then compare your reasoning with the example.
Starting knowledge: Understand inputs and outputs; coding is optional.
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