52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
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import { describe, it, expect } from 'vitest';
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import { journalNeighbours } from '@/lib/journalNav';
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const entry = (slug: string, title = slug.toUpperCase()) => ({ slug, title });
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const three = [entry('a'), entry('b'), entry('c')];
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describe('journalNeighbours', () => {
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it('offers both neighbours in the middle of a list', () => {
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expect(journalNeighbours(three, 'b')).toEqual({
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prev: { href: '/journal/a', title: 'A' },
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next: { href: '/journal/c', title: 'C' },
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});
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});
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it('omits the previous link on the first entry', () => {
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expect(journalNeighbours(three, 'a')).toEqual({ next: { href: '/journal/b', title: 'B' } });
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});
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it('omits the next link on the last entry — no wrap-around', () => {
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expect(journalNeighbours(three, 'c')).toEqual({ prev: { href: '/journal/b', title: 'B' } });
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});
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it('returns nothing for a single-entry list', () => {
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expect(journalNeighbours([entry('a')], 'a')).toEqual({});
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});
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it('returns nothing for an empty list', () => {
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expect(journalNeighbours([], 'a')).toEqual({});
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});
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it('returns nothing when the entry is not in the list', () => {
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expect(journalNeighbours(three, 'zzz')).toEqual({});
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});
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it('follows list order, not slug or title order', () => {
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const shuffled = [entry('c'), entry('a'), entry('b')];
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expect(journalNeighbours(shuffled, 'a')).toEqual({
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prev: { href: '/journal/c', title: 'C' },
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next: { href: '/journal/b', title: 'B' },
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});
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});
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it('falls back to whatever title is passed in, unchanged', () => {
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const list = [entry('untitled-entry', 'untitled-entry'), entry('b')];
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expect(journalNeighbours(list, 'b').prev).toEqual({
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href: '/journal/untitled-entry',
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title: 'untitled-entry',
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});
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});
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});
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