diff --git a/docs/recipes/WritingTests.md b/docs/recipes/WritingTests.md index ff59466cec..c8e95dee88 100644 --- a/docs/recipes/WritingTests.md +++ b/docs/recipes/WritingTests.md @@ -254,11 +254,22 @@ describe('todos reducer', () => { }) ``` +### Integration Testing the Store + +In addition to having unit tests that isolate reducers, selectors, middleware, you can verify they are all integrated correctly, by integration testing the whole store. These integration style tests will be less brittle & more resilient to to refactorings (such as switching from one type of Redux middleware to another, or renaming a selector), but also may require more mocking. + +```js +const store = createStore(rootReducer) +expect(store.getState()).toMatchObject({ loggedIn: false }) +store.dispatch({ type: 'LOGIN' }) +expect(store.getState()).toMatchObject({ loggedIn: true }) +``` + ### Components A nice thing about React components is that they are usually small and only rely on their props. That makes them easy to test. -First, we will install [React Testing Library](https://testing-library.com/docs/react-testing-library/intro). React Testing Library is a simple and complete React DOM testing utilities that encourage good testing practices. It uses react-dom's `render` function and `act` from react-dom/tests-utils. +First, we will install [React Testing Library](https://testing-library.com/docs/react-testing-library/intro). React Testing Library is a simple and complete React DOM testing utility that encourages good testing practices. It uses react-dom's `render` function and `act` from react-dom/tests-utils. Alternatively [Enzyme](https://enzymejs.github.io/enzyme/) or [React test-renderer](https://reactjs.org/docs/test-renderer.html) can be used. ```sh npm install --save-dev @testing-library/react @@ -270,7 +281,7 @@ If you are using jest as recommended above, we also recommend installing [jest-d npm install --save-dev @testing-library/jest-dom ``` -To test the components, we `render` them into the DOM and pass stubbed callbacks as props, then we assert wheter the callbacks were called when expected. +To test the components, we `render` them into the DOM and pass stubbed callbacks as props, then we assert whether the callbacks were called when expected. #### Example @@ -354,6 +365,7 @@ export default connect(mapStateToProps)(App) To test it, we can use the `wrapper` option in React Testing Library's `render` function and export our own `render` function as explained in React Testing Library's [setup docs](https://testing-library.com/docs/react-testing-library/setup). Our `render` function can look like this: + ```js // test-utils.js import React from 'react' @@ -367,12 +379,12 @@ function render( initialState, store = createStore(reducer, initialState), ...renderOptions - } = {}, + } = {} ) { - function Wrapper({children}) { + function Wrapper({ children }) { return {children} } - return rtlRender(ui, {wrapper: Wrapper, ...renderOptions}) + return rtlRender(ui, { wrapper: Wrapper, ...renderOptions }) } // re-export everything @@ -382,6 +394,7 @@ export { render } ``` And our test can use our exported `render` function: + ```js import React from 'react' // We're using our own custom render function and not RTL's render @@ -397,6 +410,25 @@ it('Renders the connected app with initialState', () => { }) ``` +The same approach can be used with [Enzyme](https://enzymejs.github.io/enzyme/) or [React test-renderer](https://reactjs.org/docs/test-renderer.html), or other testing tools. Just wrap your container in the ``: + +```js +import React from 'react' +import { mount, shallow } from 'enzyme' +import { createStore } from 'redux' +import { Provider } from 'react-redux' + +it('Renders the connected app with initialState', () => { + const store = createStore(rootReducer, { user: 'Redux User' }) + const wrapper = mount( + + + + ) + expect(wrapper.html()).toContain('Redux User') +}) +``` + ### Middleware Middleware functions wrap behavior of `dispatch` calls in Redux, so to test this modified behavior we need to mock the behavior of the `dispatch` call. @@ -467,4 +499,6 @@ In some cases, you will need to modify the `create` function to use different mo - [React Testing Library](https://testing-library.com/docs/react-testing-library/intro): React Testing Library is a very light-weight solution for testing React components. It provides light utility functions on top of react-dom and react-dom/test-utils, in a way that encourages better testing practices. Its primary guiding principle is: "The more your tests resemble the way your software is used, the more confidence they can give you." +- [Enzyme](https://github.com/enzymejs/enzyme): Enzyme is a JavaScript Testing utility for React that makes it easier to test your React Components' output. You can also manipulate, traverse, and in some ways simulate runtime given the output. + - [React Test Utils](https://reactjs.org/docs/test-utils.html): ReactTestUtils makes it easy to test React components in the testing framework of your choice. React Testing Library uses the `act` function exported by React Test Utils. diff --git a/examples/todos/package-lock.json b/examples/todos/package-lock.json index 8ce8fa5f37..96dc9b1301 100644 --- a/examples/todos/package-lock.json +++ b/examples/todos/package-lock.json @@ -1748,6 +1748,32 @@ "integrity": "sha512-z55ocwKBRLryBs394Sm3ushTtBeg6VAeuku7utSoSnsJKvKcnXFIyC6vh27n3rXyxSgkJBBCAvyOn7gSUcTYjg==", "dev": true }, + "airbnb-prop-types": { + "version": "2.15.0", + "resolved": "https://registry.npmjs.org/airbnb-prop-types/-/airbnb-prop-types-2.15.0.tgz", + "integrity": "sha512-jUh2/hfKsRjNFC4XONQrxo/n/3GG4Tn6Hl0WlFQN5PY9OMC9loSCoAYKnZsWaP8wEfd5xcrPloK0Zg6iS1xwVA==", + "dev": true, + "requires": { + "array.prototype.find": "^2.1.0", + "function.prototype.name": "^1.1.1", + "has": "^1.0.3", + "is-regex": "^1.0.4", + "object-is": "^1.0.1", + "object.assign": "^4.1.0", + "object.entries": "^1.1.0", + "prop-types": "^15.7.2", + "prop-types-exact": "^1.2.0", + "react-is": "^16.9.0" + }, + 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--git a/examples/todos/package.json b/examples/todos/package.json index e8220efa23..b88e38621d 100644 --- a/examples/todos/package.json +++ b/examples/todos/package.json @@ -3,6 +3,9 @@ "version": "0.0.1", "private": true, "devDependencies": { + "enzyme": "^3.11.0", + "enzyme-adapter-react-16": "^1.15.2", + "jsdom-global": "^3.0.2", "react-scripts": "^3.0.0" }, "dependencies": { diff --git a/examples/todos/src/containers/VisibleTodoList.js b/examples/todos/src/containers/VisibleTodoList.js index 1c69a9ec19..6e84363d1d 100644 --- a/examples/todos/src/containers/VisibleTodoList.js +++ b/examples/todos/src/containers/VisibleTodoList.js @@ -16,7 +16,7 @@ const getVisibleTodos = (todos, filter) => { } } -const mapStateToProps = state => ({ +export const mapStateToProps = state => ({ todos: getVisibleTodos(state.todos, state.visibilityFilter) }) diff --git a/examples/todos/src/containers/VisibleTodoList.spec.js b/examples/todos/src/containers/VisibleTodoList.spec.js new file mode 100644 index 0000000000..450c336cc3 --- /dev/null +++ b/examples/todos/src/containers/VisibleTodoList.spec.js @@ -0,0 +1,179 @@ +import React from 'react' +import { mount, shallow } from 'enzyme' +import { createStore } from 'redux' +import { Provider } from 'react-redux' + +import rootReducer from '../reducers' +import VisibleTodoList, { mapStateToProps } from './VisibleTodoList'; +import TodoList from '../Components/TodoList'; +import Todo from '../Components/Todo'; +import { VisibilityFilters } from '../actions' + + +/** + * These integration tests focus on testing user facing behavior. It avoids asserting directly on any reducers, + * selectors, or isolating any children components, as well as avoids asserting on implementation details like state/props. + * + * Generally, to verify most software, you should be testing in this style. + */ +describe("integration test, high verification, less brittle, less error locatalization", () => { + it('renders an empty list', () => { + // Feel free to mock out the here to make it an integration test of only + // the Container + Redux sub-components. This could still be considered an "integration test", + // but it could integration test smaller or larger slices of functionality depending on your needs. + const store = createStore(rootReducer) + const wrapper = mount( + + + + ) + expect(wrapper.html()).toBe('') + }) + + it('renders a single todo', () => { + const store = createStore(rootReducer, { + todos: [ + { id: 1, completed: false, text: 'hello world' } + ], + visibilityFilter: VisibilityFilters.SHOW_ACTIVE + }) + const wrapper = mount( + + + + ) + expect(wrapper.html()).toBe('') + }) + + it('toggles todo', () => { + const store = createStore(rootReducer, { + todos: [ + { id: 1, completed: true, text: 'hello world' } + ], + visibilityFilter: VisibilityFilters.SHOW_ACTIVE + }) + const wrapper = mount( + + + + ) + expect(wrapper.html()).toBe('') + }) +}) + +/** + * These types of tests should be used to supplement the above "integration" style tests, for advanced users & complex apps. + * + * They do not provide the same level of verification as the integration style tests, but they allow + * for testing more edge cases with less mocking, and run faster. It may also provide diminishing returns + * to write only (or mostly) integration style tests, depending on the type of app you're testing. + * + * For example, an app with a very few, but very complex components may have a lot of "combinatorial" + * explosions of feature interactions. It may not be possible to test every combination of functionality, so + * it may make sense to have integration tests for more common combinations, and supplement with unit tests. + * + * For something simpler like this "todo" list app, these unit tests will be more tightly coupled to the + * code & should be avoided. They'll make it harder to refactor, because the tests are pinning down lots of + * implementation details. The tradeoff here, which makes this approach worth considering, is that they also + * document these implementation details (tests as docs), so in larger teams or complex apps, it can be worthwhile + * to have a varying degree of your tests isolation/unit tests like these. + * + * In more complex apps, an integration test may fail in a generic way, and having unit tests may increase the + * error localization of the tests, making it more obvious about *why* an integration test may have failed. + */ +describe("unit tests, high isolation, better error localization, brittle/less verification", () => { + describe("mapStateToProps", () => { + it('maps an empty list to empty list', () => { + const props = mapStateToProps({ + todos: [], + visibilityFilter: VisibilityFilters.SHOW_ALL + }) + expect(props).toEqual({ todos: [] }) + }); + }) + + describe(" container", () => { + it('supplies an empty list', () => { + // Feel free to mock out & the redux store here to increase the isolation of the container + const store = createStore(rootReducer) + const wrapper = mount( + + + + ) + expect(wrapper.find('TodoList').prop('todos')).toEqual([]) + }) + + it('supplies a toggleTodo prop that toggles a todo', () => { + // Feel free to mock out & the redux store here to increase the isolation of the container + const store = createStore(rootReducer, { + todos: [ + { id: 1, completed: false, text: 'hello world' } + ], + visibilityFilter: VisibilityFilters.SHOW_ACTIVE + }) + const wrapper = mount( + + + + ) + wrapper.find('TodoList').prop('toggleTodo')(1) + wrapper.update() + expect(wrapper.find('TodoList').prop('todos')).toEqual([]) + }) + }); + + describe(" presentation component", () => { + it('renders an empty list', () => { + const wrapper = shallow( + + ) + expect(wrapper.html()).toBe('
    ') + }) + + it('renders a todo, with correct onClick prop', () => { + const id = 1 + const toggleTodo = jest.fn() + const wrapper = shallow( + + ) + expect(wrapper.find('Todo').props()).toMatchObject({ + id: 1, + completed: false, + text: 'hello world', + }) + expect(toggleTodo).toHaveBeenCalledTimes(0) + wrapper.find('Todo').prop('onClick')() + expect(toggleTodo).toHaveBeenCalledTimes(1) + expect(toggleTodo).toHaveBeenCalledWith(id) + }) + }) + + describe(" presentation component", () => { + it('calls toggleTodo callback prop on click', () => { + const toggleTodo = jest.fn() + const wrapper = shallow( + + ) + expect(toggleTodo).toHaveBeenCalledTimes(0) + wrapper.find('li').prop('onClick')() + expect(toggleTodo).toHaveBeenCalledTimes(1) + }) + }) +}) diff --git a/examples/todos/src/setupTests.js b/examples/todos/src/setupTests.js new file mode 100644 index 0000000000..c48707005a --- /dev/null +++ b/examples/todos/src/setupTests.js @@ -0,0 +1,5 @@ +import { configure } from 'enzyme' +import Adapter from 'enzyme-adapter-react-16' +import 'jsdom-global/register' + +configure({ adapter: new Adapter() })