aboutFilmReducer.js

import { handleActions } from "redux-actions";
import * as aboutFilmActions from "../actions/aboutFilmActions";
import { Record, List } from "immutable";

const FilmRecord = Record({
  title: "",
  year: 0,
  ageRestriction: 0,
  slug: "",
  description: "",
  genre: List(),
  dates: List(),
  seats: 0,
  price: 0
});

const AboutFilmRecord = Record({
  film: new FilmRecord(),
  loading: true,
  error: ""
});

const aboutFilmReducer = handleActions(
  {
    [aboutFilmActions.fetchFilmBySlugRequested]: state =>
      state.set("loading", true),
    [aboutFilmActions.fetchFilmBySlugSucceed]: (state, { payload }) =>
      state.set("loading", false).set("film", payload.film),
    [aboutFilmActions.fetchFilmBySlugFailed]: (state, { payload }) =>
      state.set("loading", false).set("error", payload)
  },
  new AboutFilmRecord()
);

export default aboutFilmReducer;

aboutFilmReducer.test.js

import { Record, List } from "immutable";
import aboutFilmReducer from "./aboutFilmReducer";

const FilmRecord = Record({
  title: "",
  year: 0,
  ageRestriction: 0,
  slug: "",
  description: "",
  genre: List(),
  dates: List(),
  seats: 0,
  price: 0
});

const AboutFilmRecord = Record({
  film: new FilmRecord(),
  loading: true,
  error: ""
});

describe("reducer: aboutFilmsReducer", () => {
  const initialState = new AboutFilmRecord();
  test("is correct initial state", () => {
    const nextState = aboutFilmReducer(undefined, {});

    expect(initialState.equals(nextState)).toBe(true);
  });
});

output.txt

 FAIL  src/store/reducer/aboutFilmReducer.test.js
  reducer: aboutFilmsReducer
    × is correct initial state (29ms)

  ● reducer: aboutFilmsReducer › is correct initial state

    expect(received).toBe(expected) // Object.is equality

    Expected: true
    Received: false

      25 |     const nextState = aboutFilmReducer(undefined, {});
      26 |     console.log(nextState);
    > 27 |     expect(initialState.equals(nextState)).toBe(true);
         |                                            ^
      28 |   });
      29 | });
      30 |

      at Object.<anonymous> (src/store/reducer/aboutFilmReducer.test.js:27:44)

  console.log src/store/reducer/aboutFilmReducer.test.js:26
    Record {
      __ownerID: undefined,
      _values: List {
        size: 3,
        _origin: 0,
        _capacity: 3,
        _level: 5,
        _root: null,
        _tail: undefined,
        __ownerID: undefined,
        __hash: undefined,
        __altered: false
      }
    }

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        4.015s
Ran all test suites related to changed files.

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