Test Driven Development

tdd.js

const Calculator = {
  add: (num1, num2) => {
    return num1 + num2;
  },
  sub: (num1, num2) => {
    return num1 - num2;
  },
  multiply: (num1, num2) => {
    return num1 * num2;
  }
};

const testAdd = () => {
  const num1 = 2;
  const num2 = 2;
  const expectedOutput = 4;
  const actualOutput = Calculator.add(num1, num2);
  if (actualOutput === expectedOutput) {
    console.log("test result: success");
  } else {
    console.log("test result: failed");
  }
};
const testSub = () => {
  const num1 = 4;
  const num2 = 2;
  const expectedOutput = 2;
  const actualOutput = Calculator.sub(num1, num2);
  if (actualOutput === expectedOutput) {
    console.log("test result: success");
  } else {
    console.log("test result: failed");
  }
};
const testMultiply = () => {
  const num1 = 2;
  const num2 = 2;
  const expectedOutput = 4;
  const actualOutput = Calculator.multiply(num1, num2);
  if (actualOutput === expectedOutput) {
    console.log("test result: success");
  } else {
    console.log("test result: failed");
  }
};
testAdd();
testSub();
testMultiply();