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chai-plugin-api.md

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Chai plugin

vue-test includes a chai plugin which you can use to test a component mounted with the mount() function.

It cannot test Vue components directly as it relies on the utility functions provided by mount(). Wrap your components using mount() first: the documentation for that can be found in mount-api.md.

Here's how you add the plugin to chai:

import { chaiPlugin } from 'vue-test';
chai.use(chaiPlugin);

This adds a number of useful functions that you can use when using the BDD style of chai assertions with expect and should.

Here's a very quick overview of what you can do:

  • expect(mountedComponent).to.be.ok
  • expect(mountedComponent).to.be.tag('p')
  • expect(mountedComponent).to.contain.tag('p')
  • expect(mountedComponent).to.match.selector('#id .class')
  • expect(mountedComponent).to.contain.selector('#id .class')
  • expect(mountedComponent).to.be.empty
  • expect(mountedComponent).to.have.className('alert')
  • expect(mountedComponent).to.not.be.fragment
  • expect(mountedComponent).to.have.value('input value')
  • expect(mountedComponent).to.have.text('some text')
  • expect(mountedComponent).to.contain.text('some text')
  • expect(mountedComponent).to.have.attribute('style')
  • expect(mountedComponent).to.have.attribute('style').that.equals('something')

All of these are negatable: just add .not after .to.

And a full breakdown:

.to.be.ok

Tests whether a component exists.

expect(mountedComponent).to.be.ok; // correct
expect(mountedComponent.find('.not-found')).to.be.ok; // will throw

.to.be.tag(tagName)

Tests whether a component is an element with a given tag name.

expect(mountedComponent).to.be.tag('p');
expect(mountedComponent).not.to.be.tag('div');

.to.contain.tag(tagName)

Tests whether a component contains an element with a given tag name.

expect(mountedComponent).to.contain.tag('p');

.to.match.selector(selector)

Tests whether a component matches a given selector.

expect(mountedComponent).to.match.selector('p.text [data-something]');

.to.contain.selector(selector)

Tests whether a component contains an element matching a given selector.

expect(mountedComponent).to.contain.selector('.component__child');

.to.be.empty

Tests whether a component has no children.

expect(mountedComponent).to.be.empty;

.to.have.className(className)

Tests whether a component has a given class name.

expect(mountedComponent).to.have.className('component--red');

.to.have.value(className)

Tests whether a component has a given value (useful for input elements).

expect(mountedComponent).to.have.value('input text here');

.to.have.text(className)

Tests whether a component's text equals a given value.

expect(mountedComponent).to.have.text('Hello world!');

.to.contain.text(className)

Tests whether a component's text contains a given value.

expect(mountedComponent).to.contain.text('world!');

.to.have.attribute(attribute)

Tests whether a component has a given attribute.

expect(mountedComponent).to.have.attribute('id');

.to.have.attribute(attribute).that.equals(attributeValue)

Tests whether a component has a given attribute, and tests it against a given value.

expect(mountedComponent).to.have.attribute('id').that.equals('app');