Quandoo Unit Testing Tutorial

Enzyme basics

• render types

Jest basics

• expect().[comparatorMethod]
• Putting it together with enzyme; see basic.test.js

Testing props with StyledComponents

• renderedComponent.props()
• renderedComponent.find()
• DRY: setup()

Testing event handlers

• events.test.js

Mocking modules

mocking.test.js

Mounting / Testing Lifecycle events

lifecycle.test.js

Testing Higher-Order Components

Gotchas

• Object comparison, toEqual + expect.objectContaining, not toBe
• If spying on prototype object (or in doubt), jest.clearAllMocks() between each test

Future

• Testing mock-heavy containers
• Testing sagas (i.e. async/generator functions)