jest-enzyme-matchers v1.0.0

jest-enzyme-matchers

Enzyme specific jest matchers

Installation

1. Add package

   npm install jest-enzyme-matchers --save-dev

2. Add testFrameworkScriptFile

   Set up a setupTestFrameworkScriptFile. Create that file and add it to the jest configuration.

3. Add matchers to Jest

   In that testFrameworkScriptFile file, import the matchers and add them to jest

   import * as enzymeMatchers from 'jest-enzyme-matchers'
   
   expect.extend(enzymeMatchers)
   
   // more expect.extend calls for your own matcheres
   // expect.extend({ /* ... */ })

Usage

toRender(selector)

Passes when at least one element matching the selector is found in the wrapper.

import Icon from 'somewhere'

describe('Component', () => {
  const wrapper = shallow(<Component />)
  it('should render an Icon', () => {
    expect(wrapper).toRender(Icon)
  })
  it('should render a Button', () => {
    expect(wrapper).toRender('Button')
  })
})

toRenderElementTimes(selector, times)

Passes when the number of elements matching the selector found in the wrapper matches times exactly.

import Icon from 'somewhere'

describe('Component', () => {
  const wrapper = shallow(<Component />)
  it('should render one Icon', () => {
    expect(wrapper).toRenderElementTimes(Icon, 1)
  })
  it('should render two Buttons', () => {
    expect(wrapper).toRenderElementTimes('Button', 2)
  })
})