4-tax.js

/*
  SALES TAX
  =========
  A business requires a program that calculates how much sales tax to charge
  Sales tax is 20% of the price of the product
*/

function calculateSalesTax() {}

/*
  CURRENCY FORMATTING
  ===================
  The business has informed you that prices must have 2 decimal places
  They must also start with the currency symbol
  Write a function that adds tax to a number, and then transforms the total into the format £0.00

  Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
*/

function addTaxAndFormatCurrency() {}

/* ======= TESTS - DO NOT MODIFY =====
There are some Tests in this file that will help you work out if your code is working.
To run these tests type `node 4-tax.js` into your terminal
*/

const util = require('util');

function test(test_name, actual, expected) {
    let status;
    if (actual === expected) {
        status = "PASSED";
    } else {
        status = `FAILED: expected: ${util.inspect(expected)} but your function returned: ${util.inspect(actual)}`;
    }

    console.log(`${test_name}: ${status}`);
}

test("calculateSalesTax function - case 1 works", calculateSalesTax(15), 18)
test("calculateSalesTax function - case 2 works", calculateSalesTax(17.5), 21)
test("calculateSalesTax function - case 3 works", calculateSalesTax(34), 40.8)

test("addTaxAndFormatCurrency function - case 1 works", addTaxAndFormatCurrency(15), "£18.00")
test("addTaxAndFormatCurrency function - case 2 works", addTaxAndFormatCurrency(17.5), "£21.00")
test("addTaxAndFormatCurrency function - case 3 works", addTaxAndFormatCurrency(34), "£40.80")