/
forwardRef-test.js
158 lines (133 loc) · 4.63 KB
/
forwardRef-test.js
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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
describe('forwardRef', () => {
let PropTypes;
let React;
let ReactNoop;
beforeEach(() => {
jest.resetModules();
PropTypes = require('prop-types');
React = require('react');
ReactNoop = require('react-noop-renderer');
});
it('should update refs when switching between children', () => {
function FunctionalComponent({forwardedRef, setRefOnDiv}) {
return (
<section>
<div ref={setRefOnDiv ? forwardedRef : null}>First</div>
<span ref={setRefOnDiv ? null : forwardedRef}>Second</span>
</section>
);
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<FunctionalComponent {...props} forwardedRef={ref} />
));
const ref = React.createRef();
ReactNoop.render(<RefForwardingComponent ref={ref} setRefOnDiv={true} />);
ReactNoop.flush();
expect(ref.current.type).toBe('div');
ReactNoop.render(<RefForwardingComponent ref={ref} setRefOnDiv={false} />);
ReactNoop.flush();
expect(ref.current.type).toBe('span');
});
it('should support rendering null', () => {
const RefForwardingComponent = React.forwardRef((props, ref) => null);
const ref = React.createRef();
ReactNoop.render(<RefForwardingComponent ref={ref} />);
ReactNoop.flush();
expect(ref.current).toBe(null);
});
it('should support rendering null for multiple children', () => {
const RefForwardingComponent = React.forwardRef((props, ref) => null);
const ref = React.createRef();
ReactNoop.render(
<div>
<div />
<RefForwardingComponent ref={ref} />
<div />
</div>,
);
ReactNoop.flush();
expect(ref.current).toBe(null);
});
it('should support propTypes and defaultProps', () => {
function FunctionalComponent({forwardedRef, optional, required}) {
return (
<div ref={forwardedRef}>
{optional}
{required}
</div>
);
}
const RefForwardingComponent = React.forwardRef(function NamedFunction(
props,
ref,
) {
return <FunctionalComponent {...props} forwardedRef={ref} />;
});
RefForwardingComponent.propTypes = {
optional: PropTypes.string,
required: PropTypes.string.isRequired,
};
RefForwardingComponent.defaultProps = {
optional: 'default',
};
const ref = React.createRef();
ReactNoop.render(
<RefForwardingComponent ref={ref} optional="foo" required="bar" />,
);
ReactNoop.flush();
expect(ref.current.children).toEqual([{text: 'foo'}, {text: 'bar'}]);
ReactNoop.render(<RefForwardingComponent ref={ref} required="foo" />);
ReactNoop.flush();
expect(ref.current.children).toEqual([{text: 'default'}, {text: 'foo'}]);
expect(() =>
ReactNoop.render(<RefForwardingComponent ref={ref} optional="foo" />),
).toWarnDev(
'Warning: Failed prop type: The prop `required` is marked as required in ' +
'`ForwardRef(NamedFunction)`, but its value is `undefined`.\n' +
' in ForwardRef(NamedFunction) (at **)',
);
});
it('should warn if not provided a callback during creation', () => {
expect(() => React.forwardRef(undefined)).toWarnDev(
'forwardRef requires a render function but was given undefined.',
);
expect(() => React.forwardRef(null)).toWarnDev(
'forwardRef requires a render function but was given null.',
);
expect(() => React.forwardRef('foo')).toWarnDev(
'forwardRef requires a render function but was given string.',
);
});
it('should warn if no render function is provided', () => {
expect(React.forwardRef).toWarnDev(
'forwardRef requires a render function but was given undefined.',
);
});
it('should warn if the render function provided has propTypes or defaultProps attributes', () => {
function renderWithPropTypes() {
return null;
}
renderWithPropTypes.propTypes = {};
function renderWithDefaultProps() {
return null;
}
renderWithDefaultProps.defaultProps = {};
expect(() => React.forwardRef(renderWithPropTypes)).toWarnDev(
'forwardRef render functions do not support propTypes or defaultProps. ' +
'Did you accidentally pass a React component?',
);
expect(() => React.forwardRef(renderWithDefaultProps)).toWarnDev(
'forwardRef render functions do not support propTypes or defaultProps. ' +
'Did you accidentally pass a React component?',
);
});
});