recover.test.ts

import test from "node:test";
import { ok, equal } from "node:assert/strict";

import Future from "./index.js";

test("recover function should transform an error of the Future into a resolved value", async () => {
  const a = Future.recover(Future.fail(1), (n) => n + 1);

  return a.then((n) => equal(n, 2));
});

test("recover function will unwrap a FutureLike returned by a callback", async (context) => {
  await context.test("resolved", async () => {
    const a = Future.recover(Future.fail(1), (n) => Future.of(n + 1));

    return a.then((n) => equal(n, 2));
  });

  await context.test("rejected", async () => {
    const a = Future.recover(Future.fail(1), (n) => Future.fail(n + 1));

    return a.catch((n) => equal(n, 2));
  });
});

test("recover function can accept the Future later and apply callback on it", async () => {
  const a = Future.recover((n: number) => n + 1);

  ok(!Future.is(a));
  ok(typeof a === "function");

  return a(Future.fail(1)).then((n) => equal(n, 2));
});