Child context for shallow rendering API

[DullReferenceException]

When testing our HOC-wrapped components, we often use the pattern of shallow-rendering one more level deep:

class MainComponent { /*...*/ };
export default connect(/*...*/)(MainComponent);

const tree = shallow(<WrappedComponent/>, { context }).shallow();

The problem is that the child context is not being propagated, so when the inner component is rendered, its context is missing.

I see that a childContextTypes option was provided when doing a full render here: #171, but shouldn't we have the same thing for shallow rendering?

[AshCoolman]

From the same discussion:

there is no need for it in ShallowWrapper.. (the problem was with context of deeper child nodes, there are none in ShallowWrapper)

• @jakubzitny add option for childContextTypes of ReactWrapper #171 (comment)

[DullReferenceException]

Yep, that was the comment, but there is the need for establishing child context if you're rendering child nodes (through calling .shallow() for example) even with shallow rendering.

[ljharb]

Highly related to #664.

[ljharb]

Fixed in #664.