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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  <script src="https://wzrd.in/standalone/expect@latest"></script>
  <script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
</head>
<body>
</body>
</html>
 
/*
 * Open the console
 * to see that the tests pass.
 */
const todo = (state, action) => {
  switch (action.type) {
    case 'ADD_TODO':
      return {
        id: action.id,
        text: action.text,
        completed: false
      };
    case 'TOGGLE_TODO':
      if (state.id !== action.id) {
        return state;
      }
      return {
        ...state,
        completed: !state.completed
      };
    default:
      return state;
  }
};
const todos = (state = [], action) => {
  switch (action.type) {
    case 'ADD_TODO':
      return [
        ...state,
        todo(undefined, action)
      ];
    case 'TOGGLE_TODO':
      return state.map(t => todo(t, action));
    default:
      return state;
  }
};
const testAddTodo = () => {
  const stateBefore = [];
  const action = {
    type: 'ADD_TODO',
    id: 0,
    text: 'Learn Redux'
  };
  const stateAfter = [
    {
      id: 0,
      text: 'Learn Redux',
      completed: false
    }
  ];
  
  deepFreeze(stateBefore);
  deepFreeze(action);
  
  expect(
    todos(stateBefore, action)
  ).toEqual(stateAfter);
};
const testToggleTodo = () => {
  const stateBefore = [
    {
      id: 0,
      text: 'Learn Redux',
      completed: false
    },
    {
      id: 1,
      text: 'Go shopping',
      completed: false
    }
  ];
  const action = {
    type: 'TOGGLE_TODO',
    id: 1
  };
  const stateAfter = [
    {
      id: 0,
      text: 'Learn Redux',
      completed: false
    },
    {
      id: 1,
      text: 'Go shopping',
      completed: true
    }
  ];
  
  deepFreeze(stateBefore);
  deepFreeze(action);
  
  expect(
    todos(stateBefore, action)
  ).toEqual(stateAfter);
};
testAddTodo();
testToggleTodo();
console.log('All tests passed.');
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