function test(description, expectedResult, result) {

  if(expectedResult === result) {

    console.log(`${description} passed`);

  } else {

    console.log(`${description} failed. Expected ${result} to be ${expectedResult}`);

  }

}

​

function sum(number1, number2) { 

  return number1 + number2; 

}

​

test('sum of following numbers: "2,2" is 4', 4, sum(2, 2));

test('sum of following numbers: "2,3" is 5', 5, sum(2, 3));