import { test } from "node:test";
import assert from "node:assert/strict";
import { calculateTotalProductPrice } from "../../src/checkout/pricing.ts";

// Characterization: what calculateTotalProductPrice returns today.

test("adds up the cover, pages and ruling prices", () => {
	assert.equal(calculateTotalProductPrice({ cover: { price: 14.9 }, pages: { price: 3 }, ruling: { price: 0.5 } }), 18.4);
});

test("prices a standalone product from its cover alone", () => {
	assert.equal(calculateTotalProductPrice({ cover: { price: 9.5 } }), 9.5);
});

test("counts a missing component or price as 0", () => {
	assert.equal(calculateTotalProductPrice({ cover: null, pages: { price: null }, ruling: undefined }), 0);
});

test("returns 0 for a missing product instead of throwing", () => {
	assert.equal(calculateTotalProductPrice(null), 0);
	assert.equal(calculateTotalProductPrice(undefined), 0);
});

test("does not round the sum", () => {
	assert.equal(calculateTotalProductPrice({ cover: { price: 0.1 }, pages: { price: 0.2 } }), 0.30000000000000004);
});