bigtest.js

it("should create new state when an action is namespaced", async () => {
  // Types
  const ACCUMULATOR = "ACCUMULATOR";
  const ADD = "ADD";
  const SUBTRACT = "SUBTRACT";
  const MULTIPLY = "MULTIPLY";

  // Action creators
  function add(value) {
    return createAction(namespace(ACCUMULATOR, ADD), value);
  }

  function subtract(value) {
    return createAction(namespace(ACCUMULATOR, SUBTRACT), value);
  }

  function multiply(value) {
    return createAction(namespace(ACCUMULATOR, MULTIPLY), value);
  }

  const defaultState = {
    result: 0
  };

  // Reducer
  const myReducer = testReducer(
    createReducer(
      {
        /* Nested */
        [ACCUMULATOR]: {
          [ADD](state, action) {
            return Object.assign({}, state, {
              result: state.result + action.payload
            });
          },
          [SUBTRACT](state, action) {
            return Object.assign({}, state, {
              result: state.result - action.payload
            });
          }
        },

        // In the root
        [namespace(ACCUMULATOR, MULTIPLY)](state, action) {
          return Object.assign({}, state, {
            result: state.result * action.payload
          });
        }
      },
      defaultState
    )
  );

  expect(
    await myReducer(dispatchAll(add(2), add(2), subtract(1), multiply(2)))
  ).toMatchSnapshot();
});