React, redux, Expect and Deep Freeze // source http://jsbin.com/bihacir

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://fb.me/react-dom-0.14.3.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.4/redux.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react-redux/4.0.0/react-redux.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/expect/1.20.2/expect.min.js"></script>
  <script src="https://wzrd.in/standalone/deep-freeze@latest"></script>

<title>React, redux, Expect and Deep Freeze</title>
</head>
<body>

function testFunction(state, action) {
  if (action.type === 'INCREMENT') {
    return state + 1;
  } else if (action.type === 'DECREMENT') {
    return state - 1;
  } else {
    return state;
  }
}

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

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

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

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

expect(testFunction(1, { type: 'SOMETHINGELSE' })).toEqual(1);

console.log('tests passed!');
</script>

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

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

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

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

expect(
  testFunction(1, { type: 'SOMETHINGELSE'})
).toEqual(1);

console.log('tests passed!');
</script></body>
</html>

https://fb.me/react-0.14.3.min.js

https://fb.me/react-dom-0.14.3.min.js

https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.4/redux.min.js

https://cdnjs.cloudflare.com/ajax/libs/react-redux/4.0.0/react-redux.js

https://cdnjs.cloudflare.com/ajax/libs/expect/1.20.2/expect.min.js

https://wzrd.in/standalone/deep-freeze@latest