gerbeur/api/test/middleware/error.test.ts

import { BASE_URL } from "../helpers.ts";
import { assertEquals } from "@std/assert";
import { Application } from "@oak/oak";
import { errorMiddleware } from "../../middleware/error.ts";
import { APIErrorCode } from "../../../shared/api.ts";
import { APIException } from "../../lib/api-exception.ts";

async function handle(
  app: Application,
  path: string,
  headers: HeadersInit = {},
) {
  const res = await app.handle(new Request(`${BASE_URL}${path}`, { headers }));
  if (!res) throw new Error("no response");
  return { res, text: await res.text() };
}

Deno.test("errorMiddleware: APIExceptions keep their status, anything else is a bare 500", async () => {
  const app = new Application();
  app.use(errorMiddleware);
  app.use((ctx) => {
    if (ctx.request.url.pathname === "/api-error") {
      throw new APIException(APIErrorCode.NOT_FOUND, 404, "Nope");
    }
    throw new Error("secret internals");
  });
  const known = await handle(app, "/api-error");
  assertEquals(known.res.status, 404);
  assertEquals(JSON.parse(known.text), {
    success: false,
    error: { code: "NOT_FOUND", message: "Nope" },
  });
  const unknown = await handle(app, "/boom");
  assertEquals(unknown.res.status, 500);
  assertEquals(JSON.parse(unknown.text).error, {
    code: "SERVER_ERROR",
    message: "Unexpected server error",
  });
});