Returns the type of the current node of this wrapper. If it's a composite component, this will be the component constructor. If it's native DOM node, it will be a string of the tag name.
Note: can only be called on a wrapper of a single node.
String|Function
: The type of the current node
const wrapper = mount(<div/>);
expect(wrapper.type()).to.equal('div');
const wrapper = mount(<Foo />);
expect(wrapper.type()).to.equal(Foo);