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Epic unit tests with TypeScript, Redux, RxJS 6 and Jest
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// src/tests/unicorn/unicorn.epic.test.ts | |
import { ActionsObservable } from 'redux-observable'; | |
import { of, throwError } from 'rxjs'; | |
import { toArray } from 'rxjs/operators'; | |
import UnicornActions from '../../store/unicorn/unicorn.action'; | |
import UnicornApiService from '../../store/unicorn/unicorn.api.service'; | |
import UnicornEpics from '../../store/unicorn/unicorn.epic'; | |
describe('Unicorn test', () => { | |
describe('getUnicorn', () => { | |
test('send correct actions when success', (done) => { | |
const response = {data: {id: '1', name: 'My awesome Unicorn!'}}; | |
jest.spyOn(UnicornApiService, 'getUnicorn') | |
.mockImplementation(() => of(response)); | |
const expected = UnicornActions.done(response, UnicornActions.Types.GET_UNICORN); | |
const action$ = ActionsObservable.of( | |
UnicornActions.getUnicorn('1') | |
); | |
UnicornEpics.getUnicorn(action$) | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
test('send correct actions when error', (done) => { | |
const error = {error: 'Error'}; | |
jest.spyOn(UnicornApiService, 'getUnicorn') | |
.mockImplementation(() => throwError(error)); | |
const expected = UnicornActions.error(error, UnicornActions.Types.GET_UNICORN); | |
const action$ = ActionsObservable.of( | |
UnicornActions.getUnicorn('99') | |
); | |
UnicornEpics.getUnicorn(action$) | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
}); | |
describe('likeUnicorn', () => { | |
// Multiple actions example | |
test('send correct actions when success', (done) => { | |
const response = {data: {id: '1', name: 'My awesome Unicorn!', likeCount: 1}}; | |
jest.spyOn(UnicornApiService, 'likeUnicorn') | |
.mockImplementation(() => of(response)); | |
const expected = [ | |
UnicornActions.done(response, UnicornActions.Types.LIKE_UNICORN), | |
UnicornActions.updateUnicorn('1', {color: 'rainbow'}) | |
]; | |
const action$ = ActionsObservable.of( | |
UnicornActions.likeUnicorn('1') | |
); | |
UnicornEpics.likeUnicorn(action$) | |
.pipe(toArray()) // IMPORTANT: To get all the actions | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
test('send correct actions when error', (done) => { | |
const error = {error: 'Error'}; | |
jest.spyOn(UnicornApiService, 'likeUnicorn') | |
.mockImplementation(() => throwError(error)); | |
const expected = UnicornActions.error(error, UnicornActions.Types.LIKE_UNICORN); | |
const action$ = ActionsObservable.of( | |
UnicornActions.likeUnicorn('1') | |
); | |
UnicornEpics.likeUnicorn(action$) | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
}); | |
describe('updateUnicorn', () => { | |
test('send correct actions when success', (done) => { | |
const response = {data: {id: '1', name: 'My awesome Unicorn!', likeCount: 1, color: 'blue'}}; | |
jest.spyOn(UnicornApiService, 'updateUnicorn') | |
.mockImplementation(() => of(response)); | |
const expected = UnicornActions.done(response, UnicornActions.Types.UPDATE_UNICORN); | |
const action$ = ActionsObservable.of( | |
UnicornActions.updateUnicorn('1', {color: 'blue'}) | |
); | |
UnicornEpics.updateUnicorn(action$) | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
test('send correct actions when error', (done) => { | |
const error = {error: 'Error'}; | |
jest.spyOn(UnicornApiService, 'updateUnicorn') | |
.mockImplementation(() => throwError(error)); | |
const expected = UnicornActions.error(error, UnicornActions.Types.UPDATE_UNICORN); | |
const action$ = ActionsObservable.of( | |
UnicornActions.updateUnicorn('1', {color: 'blue'}) | |
); | |
UnicornEpics.updateUnicorn(action$) | |
.subscribe((actual: any) => { | |
expect(actual).toEqual(expected); | |
done(); | |
} | |
); | |
}); | |
}); | |
}); |
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