60 lines
2 KiB
TypeScript
60 lines
2 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { parseVariants, unitPrice, validateLines, type ProductLike } from '@/lib/cart';
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const products: ProductLike[] = [
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{ id: 'p1', name: 'Tee', price: 2900, stock: 5, variants: [{ name: 'M', priceDelta: 0 }, { name: 'L', priceDelta: 200 }] },
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{ id: 'p2', name: 'Mug', price: 1800, stock: 1 },
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];
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describe('validateLines (cart totals)', () => {
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it('sums quantity × price and applies variant price deltas', () => {
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const result = validateLines(
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[
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{ productId: 'p1', variant: 'L', quantity: 2 },
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{ productId: 'p2', quantity: 1 },
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],
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products,
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);
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expect(result.ok).toBe(true);
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if (result.ok) {
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// (2900 + 200) * 2 + 1800 = 8000
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expect(result.total).toBe(8000);
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expect(result.items).toHaveLength(2);
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}
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});
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it('rejects an empty cart', () => {
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expect(validateLines([], products)).toEqual({ ok: false, error: 'Your cart is empty.' });
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});
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it('rejects an unknown product', () => {
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const r = validateLines([{ productId: 'nope', quantity: 1 }], products);
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expect(r.ok).toBe(false);
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});
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it('rejects an unknown variant', () => {
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const r = validateLines([{ productId: 'p1', variant: 'XXL', quantity: 1 }], products);
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expect(r.ok).toBe(false);
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if (!r.ok) expect(r.error).toContain('XXL');
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});
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it('rejects a quantity above stock', () => {
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const r = validateLines([{ productId: 'p2', quantity: 99 }], products);
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expect(r.ok).toBe(false);
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if (!r.ok) expect(r.error).toContain('Only 1 left');
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});
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});
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describe('unitPrice / parseVariants', () => {
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it('adds the variant delta to the base price', () => {
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expect(unitPrice(products[0], 'M')).toBe(2900);
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expect(unitPrice(products[0], 'L')).toBe(3100);
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expect(unitPrice(products[0])).toBe(2900);
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});
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it('ignores malformed variant data', () => {
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expect(parseVariants('nope')).toEqual([]);
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expect(parseVariants([{ name: 'S' }, { nope: true }])).toEqual([{ name: 'S', priceDelta: 0 }]);
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});
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});
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