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@cowboyd Hi!

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@cowboyd Unit Testing is a Myth

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@cowboyd What is a Test?

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@cowboyd Guarantor of Quality What is a Test?

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@cowboyd Guide to Design What is a Test?

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@cowboyd Support Refactoring What is a Test?

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@cowboyd Test Engineering 5 factor tests* What is a Test? *https://www.devmynd.com/blog/five-factor-testing/

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@cowboyd Test Science What is a Test?

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@cowboyd Experiment

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@cowboyd Unit Experiment it('simulates click events', () => {
 const onButtonClick = sinon.spy();
 const wrapper = shallow((
 
 ));
 wrapper.find('button').simulate('click');
 expect(onButtonClick).to.have.property('callCount', 1);
 });

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@cowboyd Small Hypothesis A component: • with no parent • with no children • with no external state management (Redux) • with no external sequencer (saga, observable) • running in nodejs • using a simulated DOM • using simulated events Properly dispatches a handler

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@cowboyd Big Hypothesis A user on a Microsoft Surface can upgrade their the premium subscription with a single click on their settings page.

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@cowboyd Big vs Small.

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@cowboyd Big Testing

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@cowboyd React Today small testing

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@cowboyd Why not Big Testing?

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@cowboyd Big Testing is Hard • cumbersome to setup end to end • non-repeatable state management • headaches dealing with asynchrony • coordination with external services

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@cowboyd Test Engineering

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@cowboyd Big Testing in React

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@cowboyd Real Browsers

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@cowboyd Jest nope. Real Browsers

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@cowboyd Nightmare nope. Real Browsers

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@cowboyd Karma https://karma-runner.github.io Real Browsers

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@cowboyd Karma + BrowserStack Real Browsers

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@cowboyd Network

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@cowboyd Slow, Flaky or is it? Network

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@cowboyd Mirage Server Network

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@cowboyd Transport, Serialization Network: Mirage Server

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@cowboyd Factories. Fake Data. Network: Mirage Server

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@cowboyd Mirage Server Network

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@cowboyd Asynchrony

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@cowboyd Asynchrony GOOD Cause Effect time assertion

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@cowboyd Asynchrony Cause Effect time assertion BAD

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@cowboyd Convergent Assertions Asynchrony

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@cowboyd Pure Assertions Asynchrony *gluten free, with 0 side-effects

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@cowboyd describe("selecting a package title to add to my holdings", function() {
 beforeEach(function() {
 ResourcePage.toggleIsSelected();
 });
 it('reflects the desired state (YES)', function() {
 expect(ResourcePage.isSelected).to.equal(true);
 });
 );

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@cowboyd Asynchrony BEST Cause Effect time assertions

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@cowboyd Convergent Assertions Asynchrony Fast!!

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@cowboyd Demo

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@cowboyd React: Big Testing https://github.com/cowboyd/react-acceptance-testing https://github.com/thefrontside/ui-eholdings

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@cowboyd http://frontside.io we’re hiring