Finds every node in the render tree that returns true for the provided predicate function.
predicate(ReactWrapper => Boolean): A predicate function called with the passed in wrapped nodes.
ReactWrapper: A new wrapper that wraps the found nodes.
const wrapper = mount(<MyComponent />);
const complexComponents = wrapper.findWhere(n => typeof n.type() !== 'string');
expect(complexComponents).to.have.length(8);