commit 7646fe162d8421bf27d98a3861d26eeae984b6e1 Author: Paul Hitt Date: Mon Sep 28 14:55:00 2026 -0400 First public release Co-Authored-By: Claude Opus 5.5 diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..f15441a --- /dev/null +++ b/.editorconfig @@ -0,0 +1,12 @@ +root = true + +[*] +charset = utf-8 +end_of_line = lf +insert_final_newline = true +trim_trailing_whitespace = true +indent_style = space +indent_size = 2 + +[*.md] +trim_trailing_whitespace = false diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5fd8e1d --- /dev/null +++ b/.gitignore @@ -0,0 +1,8 @@ +node_modules/ +dist/ +*.log +.DS_Store +.env* +!.env.example +.npmrc +dist-cjs/ diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml new file mode 100644 index 0000000..e5a37d2 --- /dev/null +++ b/.gitlab-ci.yml @@ -0,0 +1,6 @@ +stages: [test] + +test: + stage: test + image: node:22-alpine + script: [npm ci, npm run build, npm test] diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 0000000..d1d983c --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,15 @@ +# Changelog + +## 0.2.1 - 2026-09-28 + +First public release under MIT. + +- `assertShape()` validates a payload with any zod-style parser and throws a + framework-independent `ContractDriftError`. Zod 4 symbol paths are handled. +- `expectFields()` and `assertFields()` check that requested fields actually + came back, treating `null` as present and `undefined` as absent. +- `coverage()` measures contract-check coverage against a floor and lists + the uncovered endpoints. +- `fieldReport()`, `coverageReport()`, `formatFields()` and + `formatCoverage()` produce `@extant2000/evidence-record` reports. An empty + surface is not assessed. diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000..281fa69 --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,22 @@ +# Contributing + +Issues and merge requests are welcome at +https://gitlab.com/extant2000/contract-check. + +## Ground rules + +- **A test that cannot fail proves nothing.** If you fix a bug, add a test + that fails without your fix, and check that it does fail before you submit. +- Measure, do not assume. Two modules with the same line count can be + different programs. +- Keep dependencies minimal. Every new dependency needs a reason. +- Explain why in comments, not what. + +## Before you open a merge request + +Run both of these and make sure they pass: + +``` +npm run build +npm test +``` diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..34e49b1 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2026 Extant 2000 LLC + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..d400bb1 --- /dev/null +++ b/README.md @@ -0,0 +1,100 @@ +# ContractCheck + +Catches interface drift between two systems: a response whose shape changed, +a requested field that never came back, and endpoints with no contract check. +It is used in Hitt Hosting products. + +## What it does and why + +**A response can be perfectly valid while the field you asked for is +missing.** Stripe removed `invoice.payment_intent` in its 2025-03-31 (Basil) +API version, and Stripe ignores an unknown `expand` path instead of rejecting +it. A stale expand keeps succeeding and returns a well-formed invoice without +the field. There is no error and no warning; the client secret is absent and +the payment form cannot mount, while typecheck, lint and the test suite all +pass. A schema validator cannot catch this, because the invoice is valid. The +only way to detect it is to check that what you requested actually came back. + +ContractCheck has three parts. + +- `assertShape()` validates a payload against any schema with a zod-style + `safeParse` and throws a `ContractDriftError` naming the context and the + offending paths. It fails loudly because the bug it targets is an endpoint + dropping a field the UI needs: nothing errors, the page renders, and the + number is just wrong. A 500 naming the path beats a plausible screen. The + error is a plain `Error`, not tied to a web framework, so you map it to your + own transport. +- `expectFields()` and `assertFields()` check that each requested dot path is + present in the response. An explicit `null` counts as present: `null` means + the provider answered "no value", while `undefined` means it never + acknowledged the request. A `why` note on each expectation is quoted in the + failure, so it says what breaks and not only what is missing. +- `coverage()` measures how much of an API surface is contract-checked, + against a floor you can raise over time so coverage cannot slip back. It + lists the uncovered endpoints, because a bare percentage tells you there is + a gap, not where it is. + +The `Parser` type accepts Zod 4 schemas, whose issue paths may include +symbols, and symbol path segments are rendered without crashing. + +## Reports + +`fieldReport()` and `formatFields()` make each requested path its own +finding, so "the response is a valid object" and "the field you asked for is +absent" never collapse into one verdict. If no fields were asserted, the +report is not assessed. + +`coverageReport()` and `formatCoverage()` report an empty surface as not +assessed, not 0%. "0% covered" for a surface with no endpoints describes a +failure that did not happen. Uncovered endpoints are listed one by one as not +assessed. Reports use the `@extant2000/evidence-record` format. + +## Usage + +```ts +import { assertShape, expectFields, assertFields, formatFields, coverage, formatCoverage } from '@extant2000/contract-check' +import { z } from 'zod' // or any parser with a zod-style safeParse + +// 1. Response shape +const payload: unknown = { id: 'm1', name: 'Survey' } // e.g. a parsed response body +const Mission = z.object({ id: z.string(), name: z.string() }) +const mission = assertShape(Mission, payload, 'GET /missions/:id') + +// 2. Requested fields actually returned +const subscription = { id: 'sub_1', latest_invoice: { id: 'in_1' } } // response from the provider +const expectations = [ + { path: 'latest_invoice.payment_intent', why: 'the client secret is needed to mount the payment form' }, + 'id', +] +const result = expectFields(subscription, expectations) +console.log(formatFields(result, { context: 'stripe.subscriptions.create', expectations })) +assertFields(subscription, expectations, 'stripe.subscriptions.create') // or throw + +// 3. Coverage against a floor +const c = coverage(['GET /a', 'GET /b', 'POST /c', 'GET /d'], ['GET /a', 'GET /b', 'POST /c'], 80) +console.log(formatCoverage(c, 80)) +``` + +For a subscription whose invoice lacks `payment_intent`, the field report +fails at critical severity on `latest_invoice.payment_intent`, quotes the +`why` note, and passes `id`. The coverage example prints: + +``` +✗ HIGH 3 of 4 endpoints contract-checked (75%) [NOT MET] + Below the ratchet floor of 80%. + evidence: Contract coverage = 75% (4 samples) +· MEDIUM GET /d has no contract check [NOT ASSESSED] +``` + +ContractCheck does not depend on zod. Any object with a compatible +`safeParse` works. + +## Install + +``` +npm install @extant2000/contract-check +``` + +## License + +MIT. See [LICENSE](LICENSE). diff --git a/SECURITY.md b/SECURITY.md new file mode 100644 index 0000000..b88987e --- /dev/null +++ b/SECURITY.md @@ -0,0 +1,6 @@ +# Security + +Please report vulnerabilities privately by email to security@extant2000.com. +Do not open a public issue for a security problem. + +We aim to acknowledge every report within 5 business days. diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..3b39b9c --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1504 @@ +{ + "name": "@extant2000/contract-check", + "version": "0.2.1", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "@extant2000/contract-check", + "version": "0.2.1", + "license": "MIT", + "dependencies": { + "@extant2000/evidence-record": "^0.1.2" + }, + "devDependencies": { + "typescript": "^5.6.0", + "vitest": "^2.1.0" + } + }, + "node_modules/@esbuild/aix-ppc64": { + "version": "0.21.5", + "resolved": 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"0.2.1", + "private": false, + "description": "Catches interface drift between two systems before deployment.", + "license": "MIT", + "type": "module", + "main": "dist/index.js", + "files": [ + "dist", + "src", + "README.md", + "LICENSE" + ], + "repository": { + "type": "git", + "url": "https://gitlab.com/extant2000/contract-check.git" + }, + "types": "dist/index.d.ts", + "exports": { + ".": { + "types": "./dist/index.d.ts", + "import": "./dist/index.js" + } + }, + "scripts": { + "build": "tsc", + "test": "vitest run", + "prepublishOnly": "npm run build" + }, + "devDependencies": { + "typescript": "^5.6.0", + "vitest": "^2.1.0" + }, + "dependencies": { + "@extant2000/evidence-record": "^0.1.2" + }, + "author": "Extant 2000 LLC", + "homepage": "https://gitlab.com/extant2000/contract-check", + "bugs": { + "url": "https://gitlab.com/extant2000/contract-check/-/issues" + } +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..1b15817 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,161 @@ +/** + * Detect when two subsystems' interface assumptions drift. + * + * Two design points: + * + * 1. **Framework-agnostic.** A helper that throws a framework-specific HTTP + * error ties itself to that framework. This throws a plain + * `ContractDriftError` the caller maps to its own transport. + * 2. **Request contracts, not just response shapes.** A shape validator + * checks what came back. It cannot catch a provider that SILENTLY IGNORES + * part of the request — see `expectFields` below. + */ + +/** Anything with a zod-style `safeParse`. Avoids depending on zod itself. */ +export interface Parser { + safeParse: (data: unknown) => { success: true, data: T } | { + success: false + error: { + /** + * Zod 4 widened issue paths to `PropertyKey[]`, which includes symbol. + * Narrowing to string|number here made a Zod 4 schema unassignable to + * this interface — and where typecheck gates a pipeline, that failure + * can block a deploy without anyone reading the log. + */ + issues: Array<{ path: ReadonlyArray, message: string }> + } + } +} + +export class ContractDriftError extends Error { + readonly context: string + readonly issues: string[] + constructor(context: string, issues: string[]) { + super(`Response shape drift in ${context} — ${issues.slice(0, 3).join('; ')}`) + this.name = 'ContractDriftError' + this.context = context + this.issues = issues + } +} + +/** + * Validate a payload against a schema, throwing on drift. + * + * Fails LOUDLY on purpose. The bug class this exists for is an endpoint + * silently dropping a column the UI needs: nothing errors, the page renders, + * and the number is just wrong. A 500 naming the offending path is strictly + * better than a plausible screen. + */ +export function assertShape(schema: Parser, data: unknown, context: string): T { + const result = schema.safeParse(data) + if (!result.success) { + // `.join()` throws on a symbol element, so map through String first — + // a symbol path renders as "Symbol(x)" rather than crashing the handler + // that was trying to report a validation error. + const issues = result.error.issues.map(i => `${i.path.map(String).join('.')}: ${i.message}`) + throw new ContractDriftError(context, issues) + } + return result.data +} + +export interface FieldExpectation { + /** Dot path, e.g. `latest_invoice.confirmation_secret`. */ + path: string + /** Human note on why this field was requested. */ + why?: string +} + +export interface FieldCheckResult { + ok: boolean + missing: string[] + present: string[] +} + +function readPath(obj: unknown, path: string): unknown { + return path.split('.').reduce( + (acc, k) => (acc == null || typeof acc !== 'object' ? undefined : (acc as Record)[k]), + obj, + ) +} + +/** + * Assert a response actually contains the fields the request asked for. + * + * THE FAILURE THIS EXISTS FOR: Stripe removed `invoice.payment_intent` in the + * 2025-03-31 (Basil) API version, and Stripe **silently ignores an unknown + * `expand` path** rather than rejecting it. So a stale expand keeps succeeding + * and simply returns an invoice without the field. No error, no warning — the + * client secret is absent and the payment form cannot mount, while typecheck, + * lint and a full test suite all pass. + * + * A response-shape validator cannot catch this: the response is a perfectly + * valid invoice. The only way to detect it is to assert that what you ASKED FOR + * actually came back. + */ +export function expectFields( + data: unknown, + expectations: Array, +): FieldCheckResult { + const missing: string[] = [] + const present: string[] = [] + for (const e of expectations) { + const path = typeof e === 'string' ? e : e.path + if (readPath(data, path) === undefined) missing.push(path) + else present.push(path) + } + return { ok: missing.length === 0, missing, present } +} + +/** + * Throwing form of `expectFields`. + * + * Use at an integration boundary where a silently-ignored request parameter + * would otherwise surface as a confusing downstream failure far from its cause. + */ +export function assertFields( + data: unknown, + expectations: Array, + context: string, +): void { + const r = expectFields(data, expectations) + if (r.ok) return + const notes = expectations + .filter((e): e is FieldExpectation => typeof e !== 'string' && !!e.why) + .filter(e => r.missing.includes(e.path)) + .map(e => `${e.path} (${e.why})`) + throw new ContractDriftError( + context, + notes.length ? notes : r.missing.map(m => `${m}: requested but absent from the response`), + ) +} + +export interface CoverageReport { + total: number + covered: number + /** 0–100, one decimal. */ + pct: number + uncovered: string[] + /** True when below the floor — the caller decides whether that fails a build. */ + belowFloor: boolean +} + +/** + * Measure how much of a surface is contract-checked, against a ratchet floor. + * + * Raise the floor over time (a ratchet) so coverage cannot silently regress. Reporting `uncovered` rather than just a percentage is deliberate: a + * bare number tells you there is a gap, not where it is. + */ +export function coverage( + all: string[], + checked: Iterable, + floorPct = 0, +): CoverageReport { + const set = new Set(checked) + const uncovered = all.filter(x => !set.has(x)) + const covered = all.length - uncovered.length + const pct = all.length === 0 ? 0 : Math.round((covered / all.length) * 1000) / 10 + return { total: all.length, covered, pct, uncovered, belowFloor: pct < floorPct } +} + +export { fieldReport, coverageReport, formatFields, formatCoverage } from './report.js' +export type { FieldReportOptions } from './report.js' diff --git a/src/report.ts b/src/report.ts new file mode 100644 index 0000000..b52d3c2 --- /dev/null +++ b/src/report.ts @@ -0,0 +1,115 @@ +import { + type CapabilityReport, + type Finding, + type FormatOptions, + evidence, + formatReport as renderReport, +} from '@extant2000/evidence-record' +import type { CoverageReport, FieldCheckResult, FieldExpectation } from './index.js' + +export interface FieldReportOptions { + /** The call being checked, e.g. "stripe.subscriptions.create". */ + context?: string + /** The expectations, so a finding can quote why a field was requested. */ + expectations?: Array +} + +const why = (path: string, exps: Array = []): string | undefined => { + const e = exps.find(x => typeof x !== 'string' && x.path === path) + return typeof e === 'object' ? e.why : undefined +} + +/** + * Report a field-presence check. + * + * The distinction this library exists for survives into the vocabulary: a + * response can be a perfectly valid object (schema PASSES) while the field + * you asked for is absent (assertion FAILS), because the provider silently + * ignored part of the request. Each requested path is its own finding so the + * two cannot be collapsed into one verdict. + */ +export function fieldReport(r: FieldCheckResult, opts: FieldReportOptions = {}): CapabilityReport { + const context = opts.context ?? 'response' + const findings: Finding[] = [ + ...r.missing.map((p): Finding => ({ + id: `missing:${p}`, + summary: `${p} was requested but is absent from the response`, + determination: 'fail', + severity: 'critical', + detail: why(p, opts.expectations) + ?? 'The provider may be silently ignoring this request parameter. A schema check cannot catch this: the response is a valid object.', + evidence: [evidence.document(context, p, undefined, 'requested, not returned')], + })), + ...r.present.map((p): Finding => ({ + id: `present:${p}`, + summary: `${p} present`, + determination: 'pass', + severity: 'info', + evidence: [evidence.document(context, p, undefined, 'requested and returned')], + })), + ] + + const total = r.missing.length + r.present.length + return { + capability: 'ContractCheck', + scope: `${total} requested field(s) on ${context}`, + examined: total, + findings, + notes: total === 0 + ? ['No fields were asserted, so nothing was checked. A response that is never inspected cannot be said to conform.'] + : [], + } +} + +/** + * Report contract coverage against a ratchet floor. + * + * An empty surface is `not-assessed`, not 0%. `coverage([], …)` correctly + * returns zero, but rendering "0% covered" for a surface with no endpoints + * describes a failure that did not happen — the same error as reporting 100% + * uptime from zero samples, inverted. + */ +export function coverageReport(c: CoverageReport, floorPct = 0): CapabilityReport { + if (c.total === 0) { + return { + capability: 'ContractCheck', + scope: 'no surface supplied', + examined: 0, + findings: [], + notes: ['No endpoints were supplied, so coverage could not be computed. This is not 0% coverage — nothing was measured.'], + } + } + + return { + capability: 'ContractCheck', + scope: `${c.total} endpoint(s)`, + examined: c.total, + findings: [ + { + id: 'coverage', + summary: `${c.covered} of ${c.total} endpoints contract-checked (${c.pct}%)`, + determination: c.belowFloor ? 'fail' : 'pass', + severity: c.belowFloor ? 'high' : 'info', + detail: c.belowFloor ? `Below the ratchet floor of ${floorPct}%.` : undefined, + evidence: [evidence.measurement('Contract coverage', c.pct, c.total, { unit: '%' })], + }, + // Named individually rather than left as a percentage: a bare number + // tells you there is a gap, not where it is. + ...c.uncovered.map((path): Finding => ({ + id: `uncovered:${path}`, + summary: `${path} has no contract check`, + determination: 'not-assessed', + severity: 'medium', + evidence: [], + })), + ], + } +} + +export function formatFields(r: FieldCheckResult, opts: FieldReportOptions & FormatOptions = {}): string { + return renderReport(fieldReport(r, opts), opts) +} + +export function formatCoverage(c: CoverageReport, floorPct = 0, opts: FormatOptions = {}): string { + return renderReport(coverageReport(c, floorPct), opts) +} diff --git a/test/contract-check.test.ts b/test/contract-check.test.ts new file mode 100644 index 0000000..194158d --- /dev/null +++ b/test/contract-check.test.ts @@ -0,0 +1,232 @@ +import { describe, expect, it } from 'vitest' +import { overall, validateReport } from '@extant2000/evidence-record' +import { + ContractDriftError, + fieldReport, + coverageReport, + formatFields, + formatCoverage, + assertFields, + assertShape, + coverage, + expectFields, + type Parser, +} from '../src/index.js' + +/** Minimal zod-shaped parser so the library stays dependency-free. */ +function requireKeys(keys: string[]): Parser> { + return { + safeParse(data: unknown) { + if (data == null || typeof data !== 'object' || Array.isArray(data)) { + return { success: false as const, error: { issues: [{ path: [], message: 'expected an object' }] } } + } + const obj = data as Record + const issues = keys.filter(k => !(k in obj)).map(k => ({ path: [k], message: 'required' })) + return issues.length + ? { success: false as const, error: { issues } } + : { success: true as const, data: obj } + }, + } +} + +describe('assertShape', () => { + it('returns the parsed data when the shape holds', () => { + expect(assertShape(requireKeys(['id']), { id: 1 }, 'GET /x')).toEqual({ id: 1 }) + }) + + it('throws naming the context and the offending path', () => { + try { + assertShape(requireKeys(['id', 'name']), { id: 1 }, 'GET /missions') + expect.unreachable('should have thrown') + } catch (e) { + expect(e).toBeInstanceOf(ContractDriftError) + const err = e as ContractDriftError + expect(err.context).toBe('GET /missions') + expect(err.message).toContain('name: required') + } + }) + + it('catches null where a list was expected — the empty-table failure', () => { + expect(() => assertShape(requireKeys([]), null, 'GET /rows')).toThrow(ContractDriftError) + }) + + it('is NOT a framework HTTP error', () => { + // A framework-specific HTTP error would tie the library to one framework. + try { + assertShape(requireKeys(['a']), {}, 'ctx') + } catch (e) { + expect(e).toBeInstanceOf(Error) + expect((e as { statusCode?: number }).statusCode).toBeUndefined() + } + }) +}) + +describe('expectFields — the silently-ignored request parameter', () => { + // The motivating case: Stripe ignores an unknown `expand` path + // rather than rejecting it, so a stale expand returns a VALID invoice that + // simply lacks the field. A response-shape validator passes this. + const basilInvoice = { + id: 'in_1', + latest_invoice: { id: 'inv_1', confirmation_secret: { client_secret: 'cs_x' } }, + } + const preBasilInvoice = { + id: 'in_1', + latest_invoice: { id: 'inv_1', payment_intent: { client_secret: 'pi_x' } }, + } + + it('detects the field that was requested but never came back', () => { + const r = expectFields(basilInvoice, ['latest_invoice.payment_intent']) + expect(r.ok).toBe(false) + expect(r.missing).toEqual(['latest_invoice.payment_intent']) + }) + + it('passes when the requested field is present', () => { + expect(expectFields(preBasilInvoice, ['latest_invoice.payment_intent']).ok).toBe(true) + }) + + it('a schema validator would NOT catch this — the object is valid', () => { + // Both shapes are perfectly well-formed invoices. Only asking "did what I + // requested come back" distinguishes them. + expect(assertShape(requireKeys(['id', 'latest_invoice']), basilInvoice, 'stripe')).toBeTruthy() + expect(expectFields(basilInvoice, ['latest_invoice.payment_intent']).ok).toBe(false) + }) + + it('handles a missing intermediate segment without throwing', () => { + expect(expectFields({}, ['a.b.c']).missing).toEqual(['a.b.c']) + }) + + it('treats an explicit null as PRESENT — absent and null are different', () => { + // null means the provider answered "no value"; undefined means it never + // acknowledged the request. Conflating them hides the bug this catches. + expect(expectFields({ a: null }, ['a']).ok).toBe(true) + }) + + it('reports partial results, not just a boolean', () => { + const r = expectFields(basilInvoice, [ + 'latest_invoice.confirmation_secret', + 'latest_invoice.payment_intent', + ]) + expect(r.present).toEqual(['latest_invoice.confirmation_secret']) + expect(r.missing).toEqual(['latest_invoice.payment_intent']) + }) +}) + +describe('assertFields', () => { + it('surfaces the why-note so the failure explains itself', () => { + try { + assertFields({}, [{ path: 'latest_invoice.payment_intent', why: 'needed to mount Elements' }], 'stripe.subscriptions.create') + expect.unreachable('should have thrown') + } catch (e) { + expect((e as ContractDriftError).message).toContain('needed to mount Elements') + } + }) + + it('does not throw when everything requested came back', () => { + expect(() => assertFields({ a: 1 }, ['a'], 'ctx')).not.toThrow() + }) +}) + +describe('coverage', () => { + it('reports which items are uncovered, not just a percentage', () => { + const r = coverage(['a', 'b', 'c', 'd'], ['a', 'b'], 75) + expect(r.pct).toBe(50) + expect(r.uncovered).toEqual(['c', 'd']) + expect(r.belowFloor).toBe(true) + }) + + it('passes at exactly the floor', () => { + expect(coverage(['a', 'b'], ['a'], 50).belowFloor).toBe(false) + }) + + it('an empty surface is 0%, never a flattering 100', () => { + // Nothing to check is not full coverage. + const r = coverage([], [], 0) + expect(r.pct).toBe(0) + expect(r.covered).toBe(0) + }) + + it('ignores checked items that are not part of the surface', () => { + expect(coverage(['a'], ['a', 'ghost'], 100).pct).toBe(100) + }) +}) + +describe('report — schema pass and assertion fail are different verdicts', () => { + it('keeps a valid-object pass separate from a missing-field failure', () => { + // The Basil failure: a perfectly valid invoice missing the field that + // was asked for. One verdict cannot carry both facts. + const r = expectFields({ id: 'in_1', latest_invoice: {} }, [ + { path: 'latest_invoice.confirmation_secret', why: 'Elements cannot mount without it' }, + 'id', + ]) + expect(r.ok).toBe(false) + const rep = fieldReport(r, { context: 'stripe.subscriptions.create', expectations: [ + { path: 'latest_invoice.confirmation_secret', why: 'Elements cannot mount without it' }, + ] }) + expect(overall(rep)).toBe('fail') + const text = formatFields(r, { + context: 'stripe.subscriptions.create', + expectations: [{ path: 'latest_invoice.confirmation_secret', why: 'Elements cannot mount without it' }], + evidence: 'full', + }) + expect(text).toContain('latest_invoice.confirmation_secret') + expect(text).toContain('Elements cannot mount without it') + expect(text).toContain('stripe.subscriptions.create') + }) + + it('treats an empty surface as not-assessed, not as 0% coverage', () => { + const rep = coverageReport(coverage([], [])) + expect(overall(rep)).toBe('not-assessed') + expect(formatCoverage(coverage([], []))).toContain('This is not 0% coverage') + }) + + it('names the uncovered endpoints, not just the percentage', () => { + const c = coverage(['/a', '/b', '/c'], ['/a'], 80) + const text = formatCoverage(c, 80) + expect(text).toContain('/b') + expect(text).toContain('/c') + expect(text).toContain('Below the ratchet floor') + }) + + it('every conclusion carries a citation', () => { + const r = expectFields({ id: 'x' }, ['id', 'missing_one']) + expect(validateReport(fieldReport(r))).toEqual([]) + expect(validateReport(coverageReport(coverage(['/a'], ['/a'])))).toEqual([]) + }) +}) + +describe('Parser accepts a Zod 4 schema', () => { + it('accepts PropertyKey paths, including symbols', () => { + // Zod 4 types issue paths as PropertyKey[]. Narrowing to string|number + // made a Zod 4 schema unassignable, and where typecheck gates the + // pipeline that mismatch blocks a deploy. + const sym = Symbol('secret') + const schema = { + safeParse: () => ({ + success: false as const, + error: { issues: [{ path: ['a', 1, sym], message: 'bad' }] }, + }), + } + expect(() => assertShape(schema, {}, 'ctx')).toThrow(ContractDriftError) + try { + assertShape(schema, {}, 'ctx') + } catch (e) { + // `.join()` alone throws on a symbol; this must render, not crash. + expect((e as ContractDriftError).message).toContain('Symbol(secret)') + expect((e as ContractDriftError).message).toContain('a.1.') + } + }) + + it('still renders a plain string path unchanged', () => { + const schema = { + safeParse: () => ({ + success: false as const, + error: { issues: [{ path: ['latest_invoice', 'id'], message: 'required' }] }, + }), + } + try { + assertShape(schema, {}, 'ctx') + } catch (e) { + expect((e as ContractDriftError).message).toContain('latest_invoice.id: required') + } + }) +}) diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..9f56c30 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,8 @@ +{ + "compilerOptions": { + "target": "ES2022", "module": "ES2022", "moduleResolution": "bundler", + "declaration": true, "outDir": "dist", "rootDir": "src", + "strict": true, "skipLibCheck": true + }, + "include": ["src/**/*.ts"] +}