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{
  "scripts": {
    "test": ""
  }
}

// welcome.js
function welcome() {
  // Write Your Code Here
}

module.exports = welcome;

// tests/welcome.test.js

// Import The Function And Write Your Test Here

// get-total.js

// Write Function Code Here

// Expected Results
// getTotal() => 0
// getTotal(50) => 50
// getTotal(50, 3) => 150
// getTotal(50, 0) => 0

// join-words.js

// Write Function Code Here

// Expected Results
// joinWords() => ""
// joinWords("Hello") => "Hello"
// joinWords("Hello", "Jest") => "Hello Jest"
// joinWords("I", "Love", "Unit", "Testing") => "I Love Unit Testing"

// number-type.js

function numberType(number = 0) {
  if (number > 0) {
    return "Positive";
  }

  if (number < 0) {
    return "Negative";
  }

  return "Zero";
}

module.exports = numberType;

// tests/format-username.test.js

const formatUsername = require("../format-username");

describe("Format The Username", () => {
  test("Return Unknown If No Username Is Passed", () => {
    expect(formatUsername()).toBe("Unknown");
  });

  test("Remove Spaces From Both Ends", () => {
    expect(formatUsername(" Osama ")).toBe("Osama");
  });

  test("Remove The Leading At Sign", () => {
    expect(formatUsername("@Ahmed")).toBe("Ahmed");
  });

  test("Keep Only The First Eight Characters", () => {
    expect(formatUsername("JavaScript")).toBe("JavaScri");
  });

  test("Keep A Valid Username Unchanged", () => {
    expect(formatUsername("Sayed")).toBe("Sayed");
  });

  test("Clean The Username Before Limiting Its Length", () => {
    expect(formatUsername(" @JavaScript ")).toBe("JavaScri");
  });
});

function double(number = 0) {
  return number * 2;
}

module.exports = double;

const double = require("../double");

test("Double A Positive Number", () => {
  expect(double(5)).toBe(10);
});

test("Double A Negative Number", () => {
  expect(double(-5)).toBe(-10);
});

test("Return Zero If No Number Is Passed", () => {
  expect(double()).toBe(0);
});

// tests/numbers.test.js

let numbers = [];

// Write Your Code Here