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index.test.js
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index.test.js
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const { describe, it, expect } = require("@jest/globals");
const {
removeItem,
addItem,
countCoins,
countNotes,
sumDrawer,
canMakeAmount,
transaction,
} = require("./index.js");
describe("removeItem", () => {
it("removes a penny", () => {
const exampleDrawer = [{ name: "penny", value: 1, quantity: 5 }];
const testDrawer = removeItem("penny", exampleDrawer);
const expectedDrawer = [{ name: "penny", value: 1, quantity: 4 }];
expect(testDrawer).toEqual(expectedDrawer);
});
});
describe("addItem", () => {
it("adds a penny", () => {
const exampleDrawer = [{ name: "penny", value: 1, quantity: 5 }];
const testDrawer = addItem("penny", exampleDrawer);
const expectedDrawer = [{ name: "penny", value: 1, quantity: 6 }];
expect(testDrawer).toEqual(expectedDrawer);
});
});
describe("countCoins", () => {
it("counts the number of coins", () => {
const drawer = [
{ name: "penny", value: 1, quantity: 72 },
{ name: "nickel", value: 5, quantity: 41 },
{ name: "dime", value: 10, quantity: 31 },
{ name: "quarter", value: 25, quantity: 17 },
{ name: "one", value: 100, quantity: 90 },
{ name: "five", value: 500, quantity: 11 },
{ name: "ten", value: 1_000, quantity: 2 },
{ name: "twenty", value: 2_000, quantity: 3 },
{ name: "hundred", value: 10_000, quantity: 1 },
];
expect(countCoins(drawer)).toBe(161);
});
});
describe("countNotes", () => {
it("counts the number of notes", () => {
const drawer = [
{ name: "penny", value: 1, quantity: 72 },
{ name: "nickel", value: 5, quantity: 41 },
{ name: "dime", value: 10, quantity: 31 },
{ name: "quarter", value: 25, quantity: 17 },
{ name: "one", value: 100, quantity: 90 },
{ name: "five", value: 500, quantity: 11 },
{ name: "ten", value: 1_000, quantity: 2 },
{ name: "twenty", value: 2_000, quantity: 3 },
{ name: "hundred", value: 10_000, quantity: 1 },
];
expect(countNotes(drawer)).toBe(107);
});
});
describe("sumDrawer", () => {
it("sums the drawer", () => {
const drawer = [
{ name: "penny", value: 1, quantity: 72 },
{ name: "nickel", value: 5, quantity: 41 },
{ name: "dime", value: 10, quantity: 31 },
{ name: "quarter", value: 25, quantity: 17 },
{ name: "one", value: 100, quantity: 90 },
{ name: "five", value: 500, quantity: 11 },
{ name: "ten", value: 1_000, quantity: 2 },
{ name: "twenty", value: 2_000, quantity: 3 },
{ name: "hundred", value: 10_000, quantity: 1 },
];
expect(sumDrawer(drawer)).toBe("$335.12");
});
});
describe("canMakeAmount", () => {
it("returns false when the amount cannot be made", () => {
const makeAmountDrawer = [
{ name: "penny", value: 1, quantity: 2 },
{ name: "nickel", value: 5, quantity: 0 },
{ name: "dime", value: 10, quantity: 0 },
{ name: "quarter", value: 25, quantity: 3 },
{ name: "one", value: 100, quantity: 2 },
{ name: "five", value: 500, quantity: 1 },
{ name: "ten", value: 1_000, quantity: 1 },
];
expect(canMakeAmount(613, makeAmountDrawer)).toBe(false);
});
it("returns true when the amount can be made", () => {
const exampleDrawer = [
{ name: "penny", value: 1, quantity: 2 },
{ name: "nickel", value: 5, quantity: 0 },
{ name: "dime", value: 10, quantity: 0 },
{ name: "quarter", value: 25, quantity: 3 },
{ name: "one", value: 100, quantity: 2 },
{ name: "five", value: 500, quantity: 1 },
{ name: "ten", value: 1_000, quantity: 1 },
];
expect(canMakeAmount(1651, exampleDrawer)).toBe(true);
});
});
describe("transaction", () => {
it("returns the drawer with the right adjustments", () => {
const cost = 450;
const paid = 1000;
const inputDrawer = [
{ name: "penny", value: 1, quantity: 2 },
{ name: "nickel", value: 5, quantity: 0 },
{ name: "dime", value: 10, quantity: 0 },
{ name: "quarter", value: 25, quantity: 3 },
{ name: "one", value: 100, quantity: 2 },
{ name: "five", value: 500, quantity: 1 },
{ name: "ten", value: 1_000, quantity: 1 },
];
const outputDrawer = [
{ name: "penny", value: 1, quantity: 2 },
{ name: "nickel", value: 5, quantity: 0 },
{ name: "dime", value: 10, quantity: 0 },
{ name: "quarter", value: 25, quantity: 1 },
{ name: "one", value: 100, quantity: 2 },
{ name: "five", value: 500, quantity: 0 },
{ name: "ten", value: 1_000, quantity: 2 },
];
const testDrawer = transaction(cost, paid, inputDrawer);
expect(testDrawer).toEqual(outputDrawer);
});
});