Basic Unit Testing KO

HTML

<div id="results"></div>

JavaScript

// Code to be tested
function peopleWithAgeDrink(edad) {
    if(edad < 14){
    	return "drink toddy";
    }
    else if(edad <= 14 && edad > 18){
    	return "drink coke";
    }
    else if(edad <= 18 && edad > 21){
    	return "drink beer";
    }
    else return "drink whisky";
}

// Test Code
var results = document.getElementById("results");

  if (peopleWithAgeDrink(13) !== "drink toddy") {
      results.innerHTML += '<p style="color: red;">peopleWithAgeDrink(13) does not add up to 3</p>';
  } else {
      results.innerHTML += '<p style="color: green;">OK</p>';
  }

  if (peopleWithAgeDrink(17) !== "drink coke") {
      var msg = "Fail";
      results.innerHTML += '<p style="color: red;">' + msg + '</p>';
  } else {
      results.innerHTML += '<p style="color: green;">OK</p>';
  }
  
  if (peopleWithAgeDrink(18) !== "drink beer") {
      var msg = "Fail";
      results.innerHTML += '<p style="color: red;">' + msg + '</p>';
  } else {
      results.innerHTML += '<p style="color: green;">OK</p>';
  }
  
  if (peopleWithAgeDrink(20) !== "drink beer") {
      var msg = "Fail";
      results.innerHTML += '<p style="color: red;">' + msg + '</p>';
  } else {
      results.innerHTML += '<p style="color: green;">OK</p>';
  }
  
  if (peopleWithAgeDrink(30) !== "drink whisky") {
      var msg = "Fail";
      results.innerHTML += '<p style="color: red;">' + msg + '</p>';
  } else {
      results.innerHTML += '<p style="color: green;">OK</p>';
  }