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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125import { describe, expect, test } from "vitest";import { adjacentPosts, prevNextAround, sortPostsForPrevNext, type PrevNextCandidate,} from "src/utils/prevNextPosts";
const post = ( n: number, extra: Partial<Omit<PrevNextCandidate, "uri">> = {},): PrevNextCandidate & { uri: string } => ({ uri: `at://did:plc:x/pub.leaflet.document/${n}`, sort_date: `2026-01-0${n}T00:00:00Z`, title: `Post ${n}`, publishedAt: `2026-01-0${n}T00:00:00Z`, ...extra,});
describe("sortPostsForPrevNext", () => { test("orders oldest first and drops unpublished or untitled posts", () => { const sorted = sortPostsForPrevNext([ post(3), post(1), post(2, { title: null }), post(4, { publishedAt: null }), ]); expect(sorted.map((d) => d.uri)).toEqual([post(1).uri, post(3).uri]); });});
describe("prevNextAround", () => { const sorted = sortPostsForPrevNext([ post(1), post(2), post(3), post(4), post(5), ]);
test("neighbours, edges and two-hop preloads from the middle", () => { expect(prevNextAround(sorted, post(3).uri)).toMatchObject({ prev: { uri: post(2).uri }, next: { uri: post(4).uri }, first: { uri: post(1).uri }, last: { uri: post(5).uri }, prevPreload: { uri: post(1).uri }, nextPreload: { uri: post(5).uri }, }); });
test("a post at an edge doesn't point at itself", () => { expect(prevNextAround(sorted, post(1).uri)).toMatchObject({ prev: undefined, first: undefined, prevPreload: undefined, next: { uri: post(2).uri }, last: { uri: post(5).uri }, }); expect(prevNextAround(sorted, post(5).uri)).toMatchObject({ next: undefined, last: undefined, nextPreload: undefined, }); });
test("undefined for a post outside the run", () => { expect(prevNextAround(sorted, "at://elsewhere")).toBeUndefined(); });});
describe("adjacentPosts", () => { const sorted = sortPostsForPrevNext([post(1), post(2), post(3), post(4)]);
test("index neighbours for a post still in the run", () => { const { prev, next, atEdge } = adjacentPosts(sorted, post(2)); expect(prev?.uri).toBe(post(1).uri); expect(next?.uri).toBe(post(3).uri); expect(atEdge).toBe(false); });
test("edges have one neighbour and report atEdge", () => { expect(adjacentPosts(sorted, post(1))).toMatchObject({ prev: undefined, next: { uri: post(2).uri }, atEdge: true, }); expect(adjacentPosts(sorted, post(4))).toMatchObject({ prev: { uri: post(3).uri }, next: undefined, atEdge: true, }); });
test("a deleted post resolves to the posts that bracketed its sort_date", () => { const remaining = sortPostsForPrevNext([post(1), post(2), post(4)]); expect(adjacentPosts(remaining, post(3))).toMatchObject({ prev: { uri: post(2).uri }, next: { uri: post(4).uri }, atEdge: false, }); expect(adjacentPosts(remaining, post(5))).toMatchObject({ prev: { uri: post(4).uri }, next: undefined, atEdge: true, }); expect( adjacentPosts(remaining, { uri: "at://gone", sort_date: "2025-12-31T00:00:00Z", }), ).toMatchObject({ prev: undefined, next: { uri: post(1).uri }, atEdge: true, }); });
test("an unknown sort_date sorts to the start", () => { expect( adjacentPosts(sorted, { uri: "at://gone", sort_date: null }), ).toMatchObject({ prev: undefined, next: { uri: post(1).uri } }); });});