Unit testing <Composer> with nested <Fetch> components?

Hi! Thanks for the great libraries! I'm running into some issues trying to write enzyme unit tests for a component that follows a pattern like this, where `Fetch` comes from `react-request`:

```

{([fetchA, fetchB]) => {
if (fetchA.failed || fetchB.failed) {
return ;
}
if (fetchA.fetching || fetchB.fetching) {
return ;
}
return ;
}}

```

Do you have any examples you can share of how to test this pattern? I seem to be having trouble getting at the underlying promise chain, so my tests complete before `fetchA, fetchB, fetchC` all resolve.

Thanks!

The issue names no repository files or existing tests; start by reviewing the react-composer component usage and how nested react-request Fetch components expose their asynchronous state. Done would be a documented Enzyme example, or corresponding tests, that covers the loading, failure, and successful states after multiple fetches resolve.

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