Let AI write the tests, then make them prove something.
BookNook is live. Sam's book club actually uses it, which changes how a bug feels. Last week the wishlist button quietly broke, and she only found out when her sister texted. Tonight the agent offers something new: "Want me to write tests for the wishlist code?" Ten minutes later: ten tests, all passing. A wall of green ticks. Sam feels bulletproof.
Should she? Quick gut check, with an old friend:
Check your intuition
The AI writes ten passing tests for addTip, the tip calculator from your very first lesson. Every single one is green. Is the function now proven correct?
A test is just code that checks code: given this input, expect this output.expect(addTip(100, 10)).toBe(110) is a promise, run the suite and it either holds or fails loudly.
That's why tests upgrade Sam's loop. Reading catches what code says. Running catches what it does tonight. Tests catch what it does every night after, automatically, in seconds, on every future change. The loop just grew a gate.
This lesson is part of the full course
The free lessons are just the opening chapter. Unlock the rest of Code with AI to keep going.
AcademyLv 1 · 0