Lucas WintherandClaude Fable 5.2
edd57f0148
Audit pass: - Frame rule counts frames since the last move, so every step lasts exactly movesEvery(score) frames, also right after a speed-up - clampTime + MAX_GAP_MS: a hidden tab no longer replays the whole gap - Pong Restart keeps held keys - Fact corrections (mulberry32 output coverage, Haskell IO, uniform) - New fixture cases from a mutation analysis Extensions (all three tracks, shared fixtures, course text): - Turn queue (Exercise 10.6), persisted high score (10.7), replay viewer (10.8), play() end-to-end helper (9.5) - Optional State (4.7) and optional Module 7b, stack-safe IO - Module 12, property-based testing with generators, shrinking, invariants and a model-based oracle - Module 13, Conway's Life with a Click event - JS type checking via jsconfig, JSDoc and types.d.ts - Maintainer tools: scripts/mutate.mjs, scripts/typecheck-js.sh, Playwright end-to-end suite (e2e/, scripts/e2e.sh) Docs: docs/contract.md is the canonical contract; specs and build log under docs/superpowers. Verified: JS 728, Scala 689, F# 691 unit tests; stubs and progression M01-M13 and M07b; 176 end-to-end tests on Chromium and WebKit. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
33 lines
1.7 KiB
JavaScript
33 lines
1.7 KiB
JavaScript
// Technique 1: a fixed seed.
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// Every track's glue asks the browser for its seed the same way: it makes a Uint32Array of length 1 and hands it to
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// crypto.getRandomValues (JS: `new Uint32Array(1)`; Scala: `new Uint32Array(1)`; F#: `Array.zeroCreate<uint32> 1`,
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// which Fable compiles to a Uint32Array). This init script replaces `getRandomValues` before any page script runs,
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// writes the seed into such an array, and logs every call so a test can prove the page asked exactly once, in exactly
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// that shape. Any other request (none of the pages makes one) falls through to the real generator and is logged too.
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/** The seed every test uses unless it says otherwise. Above 2^31 on purpose: a track that read the seed as a signed
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* 32-bit number would start a different game and every comparison with the model would fail. */
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export const SEED = 0xdeadbeef
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/** Runs in the page (Playwright serialises it), so it may use only its argument. */
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const seedScript = (seed) => {
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const real = Crypto.prototype.getRandomValues
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const calls = []
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Object.defineProperty(window, '__e2eSeedCalls', { value: calls })
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Crypto.prototype.getRandomValues = function (array) {
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const type = array?.constructor?.name
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calls.push({ type, length: array?.length })
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if (type === 'Uint32Array' && array.length === 1) {
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array[0] = seed
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return array
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}
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return real.call(this, array)
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}
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}
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/** Install the fixed seed for every document the page loads from now on. */
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export const fixSeed = (page, seed = SEED) => page.addInitScript(seedScript, seed)
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/** The calls the current document made to crypto.getRandomValues: [{type, length}]. */
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export const seedCalls = (page) => page.evaluate(() => window.__e2eSeedCalls ?? null)
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