`.prop(key) => Any`

Returns the prop value for the root node of the wrapper with the provided key. It must be a single-node wrapper.

NOTE: When called on a shallow wrapper, .prop(key) will return values for props on the root node that the component renders, not the component itself. To return the props for the entire React component, use wrapper.instance().props. See .instance() => ReactComponent

Arguments

key (String): The prop name, that is, this.props[key] or props[key] for the root node of the wrapper.

Example

import PropTypes from 'prop-types';
import ValidateNumberInputComponent from './ValidateNumberInputComponent';

class MyComponent extends React.Component {
  constructor(...args) {
    super(...args);

    this.state = {
      number: 0,
    };
    this.onValidNumberInput = this.onValidNumberInput.bind(this);
  }

  onValidNumberInput(e) {
    const number = e.target.value;
    if (!number || typeof number === 'number') {
      this.setState({ number });
    }
  }

  render() {
    const { includedProp } = this.props;
    const { number } = this.state;
    return (
      <div className="foo bar" includedProp={includedProp}>
        <ValidateNumberInputComponent onChangeHandler={onValidNumberInput} number={number} />
      </div>
    );
  }
}
MyComponent.propTypes = {
  includedProp: PropTypes.string.isRequired,
};

const wrapper = shallow(<MyComponent includedProp="Success!" excludedProp="I'm not included" />);
expect(wrapper.prop('includedProp')).to.equal('Success!');

const validInput = 1;
wrapper.find('ValidateNumberInputComponent').prop('onChangeHandler')(validInput);
expect(wrapper.state('number')).to.equal(number);

const invalidInput = 'invalid input';
wrapper.find('ValidateNumberInputComponent').prop('onChangeHandler')(invalidInput);
expect(wrapper.state('number')).to.equal(0);

// Warning: .prop(key) only returns values for props that exist in the root node.
// See the note above about wrapper.instance().props to return all props in the React component.

console.log(wrapper.prop('includedProp'));
// "Success!"

console.log(wrapper.prop('excludedProp'));
// undefined

console.log(wrapper.instance().props.excludedProp);
// "I'm not included"