on-selection-callback-test.js

// ...
import { spy } from 'sinon';
// ...

it('should take an onSelection callback prop', () => {
  // "Arrange"
  const props = {
    inputs: [{}],
    onSelection: spy()
  };
  const event = { target: { value: 'test.value' } };
  const component = createComponent(props);

  // "Act"
  $(component)
    .render()
    .find('input[name=test-baseId]')
    .trigger('change', event);

  // "Assert"
  assert(props.onSelection.calledOnce, 'onSelection callback was called once');
  assert.equal(
    props.onSelection.args[0].length,
    1,
    'onSelection callback called with 1 argument'
  );

  const actual = props.onSelection.args[0][0];
  const expected = 'test.value';

  assert.equal(
    actual,
    expected,
    'onSelection callback called with value of the option which was the target of the change'
  );
});