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accounted/lib/api/v1/__tests__/openapi-examples.test.ts
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TypeScript

/**
* The registry's worked `example` must reach the OpenAPI spec.
*
* `EndpointDefinition.example` has always been required, and every endpoint
* populates `example.response`, but `generateOpenApiSpec()` never emitted it.
* The examples therefore reached only the docs markdown builder
* (lib/docs/content/reference.ts); the spec carried none, so spec consumers
* (skills/accounted-api, client generators, any agent reading
* /api/v1/openapi.json) saw schemas without a single concrete body.
*
* A condensed schema states the shape of a field. An example states the
* conventions the shape cannot express, which is the half agents get wrong.
*/
import { describe, expect, it } from 'vitest'
import { generateOpenApiSpec, listEndpoints } from '../registry'
// Side-effect import: populates the ENDPOINTS registry from every route file.
import '../load-routes'
type MediaType = { schema?: unknown; example?: unknown }
type OperationObject = {
requestBody?: { content: Record<string, MediaType> }
responses: Record<string, { content?: Record<string, MediaType> }>
}
const spec = generateOpenApiSpec('https://unit.test')
function operation(path: string, method: string): OperationObject {
const op = (spec.paths[path] as Record<string, OperationObject> | undefined)?.[method]
expect(op, `${method.toUpperCase()} ${path} missing from spec`).toBeDefined()
return op as OperationObject
}
describe('generateOpenApiSpec examples', () => {
it('attaches the registry response example to the JSON success media type', () => {
const op = operation('/api/v1/companies/{companyId}/customers', 'post')
const example = op.responses['200']?.content?.['application/json']?.example as
| { data?: unknown }
| undefined
expect(example).toBeDefined()
expect(example).toHaveProperty('data')
})
it('attaches the registry request example to the JSON request body', () => {
const op = operation('/api/v1/companies/{companyId}/customers', 'post')
const example = op.requestBody?.content['application/json']?.example as
| Record<string, unknown>
| undefined
expect(example).toBeDefined()
expect(example).toHaveProperty('name')
})
it('emits a response example on every JSON success response', () => {
const missing: string[] = []
for (const [path, item] of Object.entries(spec.paths)) {
for (const [method, op] of Object.entries(item as Record<string, OperationObject>)) {
const json = op.responses['200']?.content?.['application/json']
// 204 endpoints and binary (application/pdf) responses carry no JSON body.
if (!json) continue
if (json.example === undefined) missing.push(`${method.toUpperCase()} ${path}`)
}
}
expect(missing).toEqual([])
})
it('emits a request example on every JSON request body', () => {
// `example.request` is optional on EndpointDefinition, but a registered
// JSON body with no worked example is the gap this test exists to hold
// shut: an agent reading the spec would get a shape and no conventions.
const missing: string[] = []
for (const [path, item] of Object.entries(spec.paths)) {
for (const [method, op] of Object.entries(item as Record<string, OperationObject>)) {
const json = op.requestBody?.content['application/json']
if (!json) continue
if (json.example === undefined) missing.push(`${method.toUpperCase()} ${path}`)
}
}
expect(missing).toEqual([])
})
it('does not attach a JSON example to a binary response', () => {
// A PDF endpoint's registry example describes the JSON envelope it does
// not send; attaching it to the binary media type would be a lie.
for (const [path, item] of Object.entries(spec.paths)) {
for (const [method, op] of Object.entries(item as Record<string, OperationObject>)) {
for (const [contentType, media] of Object.entries(op.responses['200']?.content ?? {})) {
if (contentType === 'application/json') continue
expect(media.example, `${method.toUpperCase()} ${path} ${contentType}`).toBeUndefined()
}
}
}
})
it('keeps every registered endpoint carrying a response example in the registry', () => {
const missing = listEndpoints()
.filter((def) => !def.example?.response)
.map((def) => def.operation)
expect(missing).toEqual([])
})
})