"Duplicate presence of slot" warning with trigger 'click' leveled/nested slots and vue-test-utils

vue-test-slots.js

// Jasmine v2.7

import {mount} from '@vue/test-utils/dist/vue-test-utils';

const Parent = {
  name: 'Parent',
  template: `
    <Child>
      <template slot-scope="props">
        <slot name="content"></slot>
      </template>
    </Child>
  `
}

const Child = {
  name: 'Child',
  template: `
    <div>
      <slot val="123"></slot>
    </div>
  `
}

describe('Leveled slots', () => {
  it('triggers click', function() {
    const wrapper = mount(Parent, {
      slots: { content: "*parent content!*" },
      stubs: {Child}
    });
    wrapper.find('div').trigger('click');
    console.log(wrapper.html());
    // expect()
  });
});


/*
ERROR: '[Vue warn]: Duplicate presence of slot "content" found in the same render tree - this will likely cause render errors.

(found in <Anonymous>)'
LOG: '<div>*parent content!*</div>'
ERROR: '[Vue warn]: Duplicate presence of slot "content" found in the same render tree - this will likely cause render errors.
*/