Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a selector can be provided and it will filter the children by this selector
selector(EnzymeSelector[optional]): A selector to filter the children by.
ShallowWrapper: A new wrapper that wraps the resulting nodes.
const wrapper = shallow(<ToDoList items={items} />);
expect(wrapper.find('ul').children()).to.have.lengthOf(items.length);