Returns a wrapper of the first element that matches the selector by traversing up through the wrapped node's ancestors in the tree, starting with itself. It must be a single-node wrapper.
selector(EnzymeSelector): The selector to match.
ShallowWrapper: A new wrapper that wraps the resulting node.
const wrapper = shallow(<MyComponent />);
expect(wrapper.find(Foo).closest('.bar')).to.have.lengthOf(1);