import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { FetchError } from '../dist/lib/errors.js';
import { fetchWithRedirects } from '../dist/lib/fetch.js';
describe('fetchWithRedirects', () => {
it('follows validated redirect targets', async (t) => {
let callCount = 0;
const responses: [Response, Response] = [
new Response(null, {
status: 302,
headers: { location: '/next' },
}),
new Response('ok', { status: 200 }),
];
const fetchMock = async (_url: RequestInfo | URL, _init?: RequestInit) =>
responses[callCount++];
t.mock.method(globalThis, 'fetch', fetchMock);
const result = await fetchWithRedirects('https://example.com/start', {}, 5);
assert.equal(result.url, 'https://example.com/next');
assert.equal(callCount, 2);
});
it('fails when a redirect response is missing a Location header', async (t) => {
const fetchMock = async (_url: RequestInfo | URL, _init?: RequestInit) =>
new Response(null, {
status: 302,
});
t.mock.method(globalThis, 'fetch', fetchMock);
await assert.rejects(
fetchWithRedirects('https://example.com/start', {}, 5),
(error) => {
assert.ok(error instanceof FetchError);
assert.equal(
error.message,
'Redirect response missing Location header'
);
return true;
}
);
});
it('fails when too many redirects occur', async (t) => {
const fetchMock = async (_url: RequestInfo | URL, _init?: RequestInit) =>
new Response(null, {
status: 302,
headers: { location: '/next' },
});
t.mock.method(globalThis, 'fetch', fetchMock);
await assert.rejects(
fetchWithRedirects('https://example.com/start', {}, 1),
(error) => {
assert.ok(error instanceof FetchError);
assert.equal(error.message, 'Too many redirects');
return true;
}
);
});
it('fails when redirect target validation rejects', async (t) => {
const fetchMock = async (_url: RequestInfo | URL, _init?: RequestInit) =>
new Response(null, {
status: 302,
headers: { location: 'http://blocked.local' },
});
t.mock.method(globalThis, 'fetch', fetchMock);
await assert.rejects(
fetchWithRedirects('https://example.com/start', {}, 5)
);
});
});
