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Testing React.js Applications Max Stoiber - @mxstbr

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Max Stoiber Max Stoiber – @mxstbr – mxstbr.com Freelance Front-End Developer @mxstbr

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Max Stoiber – @mxstbr – mxstbr.com

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TYPES Max Stoiber – @mxstbr – mxstbr.com

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SYSTEM TESTING Max Stoiber – @mxstbr – mxstbr.com STRESS TESTING PERFORMANCE TESTING USABILITY TESTING UNIT TESTING

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Max Stoiber – @mxstbr – mxstbr.com UNIT TESTING UNIT TESTING SYSTEM TESTING STRESS TESTING PERFORMANCE TESTING USABILITY TESTING

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Max Stoiber – @mxstbr – mxstbr.com UNIT

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Max Stoiber – @mxstbr – mxstbr.com FUNCTION COMPONENT ACTIONS STORES

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WHY? Max Stoiber – @mxstbr – mxstbr.com

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CATCH BUGS BEFORE THEY HAPPEN Max Stoiber – @mxstbr – mxstbr.com

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EXECUTABLE DOCUMENTATION Max Stoiber – @mxstbr – mxstbr.com

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SAVE TIME Max Stoiber – @mxstbr – mxstbr.com

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WRITE BETTER CODE Max Stoiber – @mxstbr – mxstbr.com

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HOW? Max Stoiber – @mxstbr – mxstbr.com

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MOCHA Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com

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MJACKSON/EXPECT Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com // add.js export function add(x, y) { return x + y; }

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Max Stoiber – @mxstbr – mxstbr.com // add.test.js import { add } from './add.js'; import expect from 'expect'; describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('add()', () => { it('adds two numbers', () => { expect(add(2, 3)).toEqual(5); }); it('doesnt add the third number', () => { expect(add(2, 3, 5)).toEqual(add(2, 3)); }); });

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Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com // add.js export function add(x, y) { return x + y; }

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Max Stoiber – @mxstbr – mxstbr.com // add.js export function add(x, y) { return x + y; x * y; }

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Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com

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REDUX Max Stoiber – @mxstbr – mxstbr.com

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NavBar ├── NavBar.react.js # React component │ ├── NavBar.actions.js # Actions ├── NavBar.constants.js # Constants ├── NavBar.reducer.js # Reducer │ ├── NavBar.actions.test.js # Actions tests └── NavBar.reducer.test.js # Reducer tests Max Stoiber – @mxstbr – mxstbr.com

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ACTIONS Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com // NavBar.actions.js import { TOGGLE_NAV } from './NavBar.constants.js'; export function toggleNav() { return { type: TOGGLE_NAV }; }

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Max Stoiber – @mxstbr – mxstbr.com // NavBar.actions.test.js import { toggleNav } from './NavBar.actions'; import { TOGGLE_NAV } from './NavBar.constants'; import expect from ‘expect'; describe('NavBar actions', () => { });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBar actions', () => { describe('toggleNav', () => { it('should return the correct constant', () => { expect(toggleNav()).toEqual({ type: TOGGLE_NAV }); }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBar actions', () => { describe('toggleNav', () => { it('should return the correct constant', () => { expect(toggleNav()).toEqual({ type: TOGGLE_NAV }); }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBar actions', () => { describe('toggleNav', () => { it('should return the correct constant', () => { expect(toggleNav()).toEqual({ type: TOGGLE_NAV }); }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBar actions', () => { describe('toggleNav', () => { it('should return the correct constant', () => { expect(toggleNav()).toEqual({ type: TOGGLE_NAV }); }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBar actions', () => { describe('toggleNav', () => { it('should return the correct constant', () => { expect(toggleNav()).toEqual({ type: TOGGLE_NAV }); }); }); });

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Max Stoiber – @mxstbr – mxstbr.com

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REDUCER Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com // NavBar.reducer.js import { TOGGLE_NAV } from ‘./NavBar.constants.js'; const initialState = { open: false }; export default function NavBarReducer(state = initialState, action) { switch (action.type) { case TOGGLE_NAV: return Object.assign({}, state, { open: !state.open }); default: return state; } }

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Max Stoiber – @mxstbr – mxstbr.com // NavBar.reducer.test.js import expect from 'expect'; import NavBarReducer from './NavBar.reducer'; import { TOGGLE_NAV } from './NavBar.constants'; import { toggleNav } from './NavBar.actions'; describe('NavBarReducer', () => { it('returns the initial state', () => {}); it('handles the toggleNav action', () => {}); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('NavBarReducer', () => { it('returns the initial state', () => { expect(NavBarReducer(undefined, {})).toEqual({ open: false }); }); it('handles the toggleNav action', () => { expect(NavBarReducer(undefined, toggleNav())).toEqual({ open: true }); }); });

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Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com

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AIRBNB/ENZYME Max Stoiber – @mxstbr – mxstbr.com

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AIRBNB/ENZYME Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com // Button.react.js import React from 'react'; class Button extends React.Component { render() { return ( { this.props.children } ); } } export default Button;

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Max Stoiber – @mxstbr – mxstbr.com Click me!

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Max Stoiber – @mxstbr – mxstbr.com Click me!

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Max Stoiber – @mxstbr – mxstbr.com // Button.test.js import Button from './Button.react'; import expect from 'expect'; import { shallow } from 'enzyme'; import React from 'react'; describe('', () => { it('renders a ', () => {}); it('renders text', () => {}); it('handles clicks', () => {}); });

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Max Stoiber – @mxstbr – mxstbr.com // Button.test.js import Button from './Button.react'; import expect from 'expect'; import { shallow } from 'enzyme'; import React from 'react'; describe('', () => { it('renders a ', () => {}); it('renders text', () => {}); it('handles clicks', () => {}); });

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SHALLOW RENDERING Max Stoiber – @mxstbr – mxstbr.com

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ONE LEVEL DEEP Max Stoiber – @mxstbr – mxstbr.com

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Max Stoiber – @mxstbr – mxstbr.com
Title

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Max Stoiber – @mxstbr – mxstbr.com
Title
NORMAL RENDERING

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Max Stoiber – @mxstbr – mxstbr.com
Title
SHALLOW RENDERING

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Max Stoiber – @mxstbr – mxstbr.com // Button.test.js import Button from './Button.react'; import expect from 'expect'; import { shallow } from 'enzyme'; import React from 'react'; describe('', () => { it('renders a ', () => {}); it('renders text', () => {}); it('handles clicks', () => {}); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders a ', () => { const renderedComponent = shallow( ); expect( renderedComponent.find("button").node ).toExist(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders a ', () => { const renderedComponent = shallow( ); expect( renderedComponent.find("button").node ).toExist(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders a ', () => { const renderedComponent = shallow( ); expect( renderedComponent.find("button").node ).toExist(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders a ', () => { const renderedComponent = shallow( ); expect( renderedComponent.find("button").node ).toExist(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders text', () => { const text = "Click me!"; const renderedComponent = shallow( { text } ); expect( renderedComponent.contains(text) ).toEqual(true); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders text', () => { const text = "Click me!"; const renderedComponent = shallow( { text } ); expect( renderedComponent.contains(text) ).toEqual(true); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders text', () => { const text = "Click me!"; const renderedComponent = shallow( { text } ); expect( renderedComponent.contains(text) ).toEqual(true); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders text', () => { const text = "Click me!"; const renderedComponent = shallow( { text } ); expect( renderedComponent.contains(text) ).toEqual(true); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('renders text', () => { const text = "Click me!"; const renderedComponent = shallow( { text } ); expect( renderedComponent.contains(text) ).toEqual(true); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('handles clicks', () => { const onClickSpy = expect.createSpy(); const renderedComponent = shallow( ); renderedComponent.find('button').simulate('click'); expect(onClickSpy).toHaveBeenCalled(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('handles clicks', () => { const onClickSpy = expect.createSpy(); const renderedComponent = shallow( ); renderedComponent.find('button').simulate('click'); expect(onClickSpy).toHaveBeenCalled(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('handles clicks', () => { const onClickSpy = expect.createSpy(); const renderedComponent = shallow( ); renderedComponent.find('button').simulate('click'); expect(onClickSpy).toHaveBeenCalled(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('handles clicks', () => { const onClickSpy = expect.createSpy(); const renderedComponent = shallow( ); renderedComponent.find('button').simulate('click'); expect(onClickSpy).toHaveBeenCalled(); }); });

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Max Stoiber – @mxstbr – mxstbr.com describe('', () => { it('handles clicks', () => { const onClickSpy = expect.createSpy(); const renderedComponent = shallow( ); renderedComponent.find('button').simulate('click'); expect(onClickSpy).toHaveBeenCalled(); }); });

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Max Stoiber – @mxstbr – mxstbr.com

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@mxstbr Max Stoiber – @mxstbr – mxstbr.com HTTPS://GITHUB.COM/MXSTBR/REACT-TESTING