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Marc-André Bombeck
4ff3f3eb5d
fast-check properties with one shared configuration (tests/property/): a fixed seed on every pull request, a fresh one and more cases at night through FC_SEED and FC_NUM_RUNS, and a printed seed with the shrunk counterexample on failure. - Time zones: wall clocks agree with Intl in twenty awkward zones, a wall clock maps back to an instant showing it, a skipped hour resolves forward on the same day, every instant lies inside the window of the day it is filed under, and day keys shift and count as inverses. - Statistics: every median in the tree says the same number, medians and spreads obey order, shift and scale, a least-squares fit recovers an exact line and composes from stored sums exactly, and the segmented regression recovers a noiseless interrupted line. - Cadence and compliance: weekly and daily schedules expect exactly what a day-by-day oracle expects, in any zone and on transition days, and the rate stays within bounds and never falls when a missed dose is taken. - Encryption: every codec opens what it sealed under the key it names, rotation moves the key id and nothing else, and a tampered value never opens to anything but the sealed bytes. - Backups: randomly generated accounts come back from a disaster-recovery restore with an identical canonical dump of every generated table.
94 lines
2.8 KiB
TypeScript
94 lines
2.8 KiB
TypeScript
/**
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* One set of fast-check parameters for every property test.
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*
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* A pull request runs each property with a fixed seed, so the same inputs
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* are generated on every machine and a red run is a red run on the next
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* attempt too. The nightly workflow sets `FC_SEED` to a fresh value, which is
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* how new inputs get tried without making a pull request flaky; a failure
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* prints the seed and the shrunk counterexample, and
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* `FC_SEED=<seed> pnpm test <file>` replays it exactly.
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*
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* `FC_NUM_RUNS` scales the number of generated cases (the nightly run uses
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* more). The default keeps every property file well under a second or two.
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*/
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import fc from "fast-check";
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const DEFAULT_SEED = 20_261_022;
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function positiveInt(raw: string | undefined): number | null {
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if (!raw) return null;
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const value = Number.parseInt(raw, 10);
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return Number.isInteger(value) && value > 0 ? value : null;
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}
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export const PROPERTY_SEED = positiveInt(process.env.FC_SEED) ?? DEFAULT_SEED;
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const SCALE = positiveInt(process.env.FC_NUM_RUNS);
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/** Parameters for `fc.assert`; `numRuns` is the PR-run default per property. */
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export function propertyParameters<T>(
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numRuns = 100,
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overrides: fc.Parameters<T> = {},
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): fc.Parameters<T> {
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return {
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seed: PROPERTY_SEED,
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numRuns: SCALE ?? numRuns,
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...overrides,
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};
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}
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/** Run a property with the shared parameters. */
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export function assertProperty<T>(
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property: fc.IProperty<T>,
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numRuns?: number,
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): void {
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fc.assert(property, propertyParameters<T>(numRuns));
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}
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/** The async counterpart of {@link assertProperty}. */
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export async function assertAsyncProperty<T>(
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property: fc.IAsyncProperty<T>,
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numRuns?: number,
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): Promise<void> {
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await fc.assert(property, propertyParameters<T>(numRuns));
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}
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/**
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* IANA zones with the awkward cases in them: half- and quarter-hour offsets
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* (Kolkata, Kathmandu, Chatham, St John's), a 30-minute DST shift (Lord
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* Howe), southern-hemisphere DST (Santiago, Sydney, Auckland), a zone whose
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* DST starts at midnight (Santiago), the date line (Kiritimati, Apia), and a
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* zone with no DST at all (UTC, Kolkata).
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*/
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export const AWKWARD_ZONES = [
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"UTC",
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"Europe/Berlin",
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"Europe/London",
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"Europe/Dublin",
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"America/New_York",
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"America/Los_Angeles",
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"America/St_Johns",
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"America/Santiago",
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"America/Sao_Paulo",
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"Asia/Kolkata",
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"Asia/Kathmandu",
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"Asia/Tehran",
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"Australia/Lord_Howe",
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"Australia/Sydney",
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"Australia/Adelaide",
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"Pacific/Auckland",
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"Pacific/Chatham",
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"Pacific/Kiritimati",
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"Pacific/Apia",
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"Africa/Casablanca",
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] as const;
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export const zoneArb = fc.constantFrom(...AWKWARD_ZONES);
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/** Instants between 1995 and 2040, at millisecond resolution. */
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export const instantArb = fc.date({
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min: new Date("1995-01-01T00:00:00Z"),
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max: new Date("2040-12-31T23:59:59Z"),
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noInvalidDate: true,
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});
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