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chai-wait-for

v1.0.4

Published

poll until an assertion succeeds

Downloads

849

Readme

chai-wait-for

CircleCI Coverage Status semantic-release Commitizen friendly npm version

poll an assertion until it succeeds. Provides an especially clean syntax for working with some chai plugins like chai-fs, chai-webdriverio-async etc:

await waitFor('#submittedMessage').to.have.text('Your changes have been saved!')

Usage

npm install --save-dev chai-wait-for
// First, use the plugin
const chai = require('chai')
const chaiWaitFor = require('chai-wait-for')
chai.use(chaiWaitFor)

// Then create your `waitFor` with default options:
const waitFor = chaiWaitFor.bindWaitFor({
  // If no assertion attempt succeeds before this time elapses (in milliseconds), the waitFor will fail.
  timeout: 5000,
  // If an assertion attempt fails, it will retry after this amount of time (in milliseconds)
  retryInterval: 100,
})

it('wait for something', async function () {
  this.timeout(10000)

  const myObj = { foo: 0 }

  setInterval(() => myObj.foo++, 1000)

  // Then use it just like you would expect():
  await waitFor(myObj).to.have.property('foo').that.equals(3)

  // You can also use a getter function:
  await waitFor(() => myObj.foo).to.equal(4)

  // If you need to override the defaults:
  waitFor.timeout(1000)(myObj).to.have.property('foo').that.equals(3)
  waitFor.retryInterval(500)(myObj).to.have.property('foo').that.equals(3)
})