Codesphere Jest demo intro to matchers

functions.js

//function to add
const add = (num1, num2) => num1 + num2;
//function to multiply
const multiply = (num1, num2) => num1 * num2;
//function to create an Object
const createUser = () => {
  const user = {
    firstName: "Luke",
    lastName: "Skywalker",
  };
  return user;
};

//exporting
module.exports = { add, multiply, createUser };

functions.test.js

//importing my file to be tested
const func = require("./functions");

//testing the add function using toBe matcher
test("adds 2 and 2 to give 4", () => {
  expect(func.add(2, 2)).toBe(4);
});

//testing the multiply function using toBe matcher
test("multiplies 12 and 13 to give 156", () => {
  expect(func.multiply(12, 13)).toBe(156);
});

//using the toBeLessThanOrEqual matcher
test("Should be under 25", () => {
  const weight = 70;
  const height = 180 / 100;
  const bmi = weight / (height * height);
  expect(bmi).toBeLessThanOrEqual(25);
});

//using the toBeCloseTo matcher for floats
test("Floating point numbers", () => {
  const value = 1.3 + 2.9;
  expect(value).toBeCloseTo(4.2);
});

//using the toMatch matcher for regex
test("Secret Ingredient", () => {
  expect("There is no secret ingredient").toMatch(/secret/);
});

//using the toEqual matcher for Object type
test("Luke Skywalker", () => {
  expect(func.createUser()).toEqual({
    firstName: "Luke",
    lastName: "Skywalker",
  });
});

//using the toContain matcher for specific element in array
test("Master Oogway", () => {
  const hisWords = ["There", "are", "no", "accidents"];
  expect(hisWords).toContain("accidents");
});