text: 
  const initialState = {
    missing: false,
    propFail: false,
    double: 0
  };
  
  export default function failReducer(state = initialState, action) {
    if (action.type === 'MISSING_REDUCER_TYPO') {
      return {...state, missing: true};
    }
  
    if (action.type === 'PROP_FAIL') {
      return {...state, propFail: true};
    }
  
    if (action.type === 'DOUBLE_REDUCER') {
      return {...state, double: 1};
    }
    if (action.type === 'DOUBLE_REDUCER') {
      return {...state, double: 2};
    }
  
    // ignore reducers we don't care about
    return state;
  }
  