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index.style1.test.ts
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index.style1.test.ts
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import { processTotals } from ".";
/*
Style 1: Inline Inputs & Outputs
*/
describe("processTotals", () => {
it("can calculate total properties w/o tax & tip", () => {
const result = processTotals([
{
subTotal: 100.0,
category: `Gifts`,
date: "2021-12-01T01:02:03.456Z",
},
{
subTotal: 100.0,
tip: 10.0,
tax: 5.0,
category: `Lunch`,
date: "2021-12-02T01:02:03.456Z",
},
]);
expect(result[0].total).toBe(100.0);
expect(result[1].total).toBe(115.0);
});
it("can calculate total properties, w/ tip & tax override", () => {
const txs = [
{
subTotal: 100.0,
tax: 10.0,
tip: 20.0,
category: `Gifts`,
date: "2021-12-01T01:02:03.456Z",
},
{
subTotal: 100.0,
tax: 10.0,
tip: 30.0,
category: `Lunch`,
date: "2021-12-02T01:02:03.456Z",
},
];
const result = processTotals(txs);
// ✅ Stable, inline values
expect(result[0].total).toBe(130.0);
expect(result[1].total).toBe(140.0);
// 🟡 No mutations*, direct field mapping
expect(result.map(tx => tx.total)).toMatchObject([
130.0,
140.0,
]);
// 🔴 Repeated Calculations
expect(result[0].total).toBe((100.0 * 1.1) + 20.0);
expect(result[1].total).toBe((100.0 * 1.1) + 30.0);
});
});