Redux state test example

installationsTest.js

import {expect} from 'chai';
import reducer from '../../reducers/installations';
 
describe('reducers/installations', () => {
 
    let state;
 
    beforeEach(() => {
        state = {
            installations: [],
            isLoading: False,
        };
    });
 
    it('should not change state for unknown actions', () => {
        let newState = reducer(state, { type: 'UNKNOWN_TYPE' });
        expect(newState).to.equal(state);
    });
  
    it('should be loading on INSTALLATION_REQUESTED', () => {
        let newState = reducer(state, {
            type: INSTALLATION_REQUESTED,
        });
        expect(newState).to.deep.equal({
            installations: [],
            isLoading: True,
        });
    });
 
    it('should populate installations on INSTALLATION_RECEIVED', () => {
        let newState = reducer(state, {
            type: INSTALLATION_RECEIVED,
            installation: {
                address: 'The Road 1',
                country: 'Norway',
            },
        });
        expect(newState).to.deep.equal({
            installations: [{
                address: 'The Road 1',
                country: 'Norway',
            }],
            isLoading: True,
        });
    });
});