benjivers/notes Public Public: anyone can read this; nobody can change it.

/**

 * The API's description is the routes' own, committed: emitting it twice

 * says the same bytes, the file in git is what the table says now, and the

 * app serves exactly that file.

 */

import { afterAll, expect, test } from "bun:test";

import { mkdtempSync, readFileSync } from "node:fs";

import { tmpdir } from "node:os";

import { join } from "node:path";

import { emit, openapi } from "./openapi.ts";

import { routes } from "./routes.ts";

import { serve } from "./server.ts";

const committed = readFileSync(

  new URL("../contract/openapi.json", import.meta.url),

  "utf8",

);

test("emission is stable", () => {

  expect(emit()).toBe(emit());

});

test("contract/openapi.json is what the routes say now (else: bun run contract:emit)", () => {

  const now = JSON.parse(emit());

  const stale = !Bun.deepEquals(JSON.parse(committed), now);

  if (stale)

    console.error(

      "contract/openapi.json is stale: run `bun run contract:emit` and commit it",

    );

  expect(stale).toBe(false);

});

test("every API route is described, and every door names its cell of the table", () => {

  const doc = openapi() as {

    paths: Record<

      string,

      Record<

        string,

        { "x-contract"?: { resource: string; verb: string; least: string } }

      >

    >;

  };

  for (const route of routes.filter((r) => r.path.startsWith("/api/"))) {

    const op =

      doc.paths[route.path.replace(/:(\w+)/g, "{$1}")]?.[

        route.method.toLowerCase()

      ];

    expect([route.method, route.path, op !== undefined]).toEqual([

      route.method,

      route.path,

      true,

    ]);

    expect(typeof op?.["x-contract"]?.least).toBe("string");

  }

  expect(doc.paths["/api/audit"]?.get?.["x-contract"]).toEqual({

    resource: "audit",

    verb: "list",

    least: "admin",

  });

});

test("GET /openapi.json serves the committed file", async () => {

  const server = serve({

    port: 0,

    dataDir: mkdtempSync(join(tmpdir(), "app-openapi-")),

    identityKey: "k",

  });

  afterAll(() => server.stop(true));

  const response = await fetch(

    `http://${server.hostname}:${server.port}/openapi.json`,

  );

  expect(response.status).toBe(200);

  expect(response.headers.get("content-type")).toContain("application/json");

  expect(await response.text()).toBe(committed);

});