Question: How do I check if a component is not present, i.e. that a specific component has not been rendered?

Answer: 
You can use enzymes [`contains`](http://airbnb.io/enzyme/docs/api/ShallowWrapper/contains.html) to check if the component was rendered:

```
expect(component.contains(<ComponentName />)).toBe(false)

```
`.contains` does not expect a selector, unlike find. You can look at the length attribute of the ShallowWrapper

`expect(wrapper.find('...')).toHaveLength(0)`

I found I needed to use this syntax with Enzyme and Jest to test if a Connected Component existed in the rendered output.