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Full Rendering API (mount(...))

Full DOM rendering is ideal for use cases where you have components that may interact with DOM APIs or need to test components that are wrapped in higher order components.

Full DOM rendering requires that a full DOM API be available at the global scope. This means that it must be run in an environment that at least “looks like” a browser environment. If you do not want to run your tests inside of a browser, the recommended approach to using mount is to depend on a library called jsdom which is essentially a headless browser implemented completely in JS.

Note: unlike shallow or static rendering, full rendering actually mounts the component in the DOM, which means that tests can affect each other if they are all using the same DOM. Keep that in mind while writing your tests and, if necessary, use .unmount() or something similar as cleanup.

import { mount } from 'enzyme';
import sinon from 'sinon';
import Foo from './Foo';

describe('<Foo />', () => {
  it('calls componentDidMount', () => {
    sinon.spy(Foo.prototype, 'componentDidMount');
    const wrapper = mount(<Foo />);
    expect(Foo.prototype.componentDidMount).to.have.property('callCount', 1);
  });

  it('allows us to set props', () => {
    const wrapper = mount(<Foo bar="baz" />);
    expect(wrapper.props().bar).to.equal('baz');
    wrapper.setProps({ bar: 'foo' });
    expect(wrapper.props().bar).to.equal('foo');
  });

  it('simulates click events', () => {
    const onButtonClick = sinon.spy();
    const wrapper = mount((
      <Foo onButtonClick={onButtonClick} />
    ));
    wrapper.find('button').simulate('click');
    expect(onButtonClick).to.have.property('callCount', 1);
  });
});

`mount(node[, options]) => ReactWrapper`

Arguments

node (ReactElement): The node to render
options (Object [optional]):
options.context: (Object [optional]): Context to be passed into the component
options.attachTo: (DOMElement [optional]): DOM Element to attach the component to.
options.childContextTypes: (Object [optional]): Merged contextTypes for all children of the wrapper.
options.wrappingComponent: (ComponentType [optional]): A component that will render as a parent of the node. It can be used to provide context to the node, among other things. See the getWrappingComponent() docs for an example. Note: wrappingComponent must render its children.
options.wrappingComponentProps: (Object [optional]): Initial props to pass to the wrappingComponent if it is specified.

Returns

ReactWrapper: The wrapper instance around the rendered output.

Full Rendering API (mount(...))

mount(node[, options]) => ReactWrapper

Arguments

Returns

ReactWrapper API

`mount(node[, options]) => ReactWrapper`