expect-to-enzyme

expect-to helpers for use with enzyme.

Installation

npm install --save-dev expect-to-enzyme

Import the assertions by name, or using a namespace

import { findOne, haveClass, haveProps } from 'expect-to-enzyme'

Assertions

• findSome(selector, n) — takes a selector and asserts that it resolves to n nodes. Don't pass an n and the assertion will ensure that more than one node is matched. Also supports asserting off the matched node(s), see sub tests for details.

  Aliases:

  • findOne(selector)
  • findTwo(selector)
  • findThree(selector)

  const wrapper = shallow(
    <Foo className="test">
      <Bar />
    </Foo>
  )
  
  expect(wrapper).to(findOne(Bar)); // passes
  expect(wrapper).to(findTwo(Bar)); // expected to find 2...

• haveClass(class) — assert that a node has a class

• matchText(regex|string) - assert that a node's text includes some value,

• equalComponent(<Node />) - assert that an enzyme matches another

• haveProps(partialProps) - assert that a node has

• haveEqualProps(props) - assert that a node all and only the props defined

• haveExactProps(props) - assert that a node has props

• haveProp(name) - asserts that a node has a prop. Also supports asserting off the props value, see sub tests for details.

• assertEach(assertion) - Ensure that each node in a set matches an assertion

asserting found values

When an assertion works on a value inside of the original context, you can use the .and() method to write additional assertions on that value.

import expect from 'expect-to'
import { findOne } from 'expect-to-enzyme'

const View = ({ type, count }) =>
  <div>
    <input type="number" value={count} />
    <select value={type}>
      <option>html</option>
      <option>css</option>
      <option>js</option>
      <option>png</option>
    </select>
  </div>

describe('View', () => {
  it('renders count to an input of type number', () => {
    const wrapper = shallow(<View count={100} type="html" />)
    expect(wrapper).to(
      findOne('input')
        .and(haveProps({ type: 'number', value: 100 }))
    )
  })
})