main.test.js

/* eslint-disable no-undef */
const {
  getBiggest,
  greeting,
  isTenOrFive,
  isInRange,
  isInteger,
  fizzBuzz,
  isPrime,
} = require("./main");

describe("getBiggest(x, y)", function () {
  it("should return x if it is larger than y", function () {
    expect(getBiggest(10, 5)).toBe(10);
  });
  it("should return y if it is larger than x", function () {
    expect(getBiggest(50, 100)).toBe(100);
  });
  it("should return either one if they are the same", function () {
    expect(getBiggest(1000, 1000)).toBe(1000);
  });
});

describe("greeting(language)", function () {
  it("should return 'Guten Tag!' for German", function () {
    expect(greeting("German")).toBe("Guten Tag!");
  });
  it("should return 'Hola!' for Spanish", function () {
    expect(greeting("Spanish")).toBe("Hola!");
  });
  it("should return 'Ni Hao!' for Mandarin", function () {
    expect(greeting("Mandarin")).toBe("Ni Hao!");
  });
  it("should return 'Hello!' if no argument is passed in or if a language beyond Spanish, English, and German is passed in.", function () {
    expect(greeting("French")).toBe("Hello!");
    expect(greeting()).toBe("Hello!");
  });
});

describe("isTenOrFive(num)", function () {
  it("should return true if num is 10 or 5", function () {
    expect(isTenOrFive(10)).toBe(true);
    expect(isTenOrFive(5)).toBe(true);
  });
  it("should return false if num is not 10 or 5", function () {
    expect(isTenOrFive(11)).toBe(false);
    expect(isTenOrFive(6)).toBe(false);
    expect(isTenOrFive(0)).toBe(false);
    expect(isTenOrFive(5.01)).toBe(false);
  });
});

describe("isInRange(num)", function () {
  it("should return true if num is inside range", function () {
    expect(isInRange(35.5)).toBe(true);
    expect(isInRange(40)).toBe(true);
    expect(isInRange(49)).toBe(true);
    expect(isInRange(21)).toBe(true);
  });
  it("should return false if outside of range", function () {
    expect(isInRange(10)).toBe(false);
    expect(isInRange(20)).toBe(false);
    expect(isInRange(50)).toBe(false);
    expect(isInRange(100)).toBe(false);
  });
});

describe("isInteger(num)", function () {
  it("should return true if num is 5", function () {
    expect(isInteger(5)).toBe(true);
  });
  it("should return false if num is 0.5", function () {
    expect(isInteger(0.5)).toBe(false);
  });
  it("should return true if num is -20", function () {
    expect(isInteger(-20)).toBe(true);
  });
  it("should return true for 0", function () {
    expect(isInteger(0)).toBe(true);
  });
});

describe("fizzBuzz(num)", function () {
  it("should return fizz if divisible by 3", function () {
    expect(fizzBuzz(9)).toBe("fizz");
  });
  it("should return buzz if divisible by 5", function () {
    expect(fizzBuzz(10)).toBe("buzz");
  });
  it("should return fizzbuzz if divisible by 3 and 5", function () {
    expect(fizzBuzz(15)).toBe("fizzbuzz");
  });
  it("should return num if not divisible by 3 or 5", function () {
    expect(fizzBuzz(4)).toBe(4);
  });
});

describe("isPrime(num)", function () {
  it("should return true if num is prime", function () {
    expect(isPrime(7)).toBe(true);
    expect(isPrime(97)).toBe(true);
  });
  it("should return false if num is not prime", function () {
    expect(isPrime(10)).toBe(false);
    expect(isPrime(100)).toBe(false);
    expect(isPrime(0)).toBe(false);
    expect(isPrime(1)).toBe(false);
  });
});