eggheadio-projects/getting-started-with-redux: null

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="https://wzrd.in/standalone/expect@22.4.3"></script>
</head>
<body>
  <script src="script.jsx"></script>
</body>
</html>

/*
 * Open the console tab
 * to see that the tests pass.
 */

const counter = (state = 0, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return state + 1;
    case 'DECREMENT':
      return state - 1;
    default:
      return state;
  }
}

expect(
  counter(0, { type: 'INCREMENT' })
).toEqual(1);

expect(
  counter(1, { type: 'INCREMENT' })
).toEqual(2);

expect(
  counter(2, { type: 'DECREMENT' })
).toEqual(1);

expect(
  counter(1, { type: 'DECREMENT' })
).toEqual(0);

expect(
  counter(1, { type: 'SOMETHING_ELSE' }) 
).toEqual(1);

expect(
  counter(undefined, {})
).toEqual(0);

console.log('Tests passed!') || displayInPreview('Tests passed!');



// display in plunker preview
function displayInPreview(string) {
  var newDiv = document.createElement("div"); 
  var newContent = document.createTextNode(string); 
  newDiv.appendChild(newContent);
  document.body.appendChild(newDiv)
}