Function event

packages/react-aria/test/combobox/useComboBox.test.js:24–31

  let openSpy = jest.fn();
  let toggleSpy = jest.fn();
  let event = e => ({
    ...e,
    nativeEvent: {
      isComposing: false
    },
    preventDefault,
    stopPropagation
  });

  let defaultProps = {
    items: [{id: 1, name: 'one'}],