Question: injectEnvironment can only be called once - Jest

[JamieDixon]

I believe this issue will be fixed when React 15.4 is released as per facebook/react#7386 (comment)

I just want to check this is indeed the case and that there's no another issue causing this error that could be fixed in create-react-app.

How to reproduce:

1. npm install velocity-react
2. Create a component that utilized velocity-react:

<div>
     <VelocityTransitionGroup
         enter={{ animation: { opacity: 1 }, duration: 200 }}
         leave={{ animation: { opacity: 0 }, duration: 200 }}
         runOnMount
       >
          <div />
       </VelocityTransitionGroup>
</div>

3. Write a Jest snapshot test that checks that this component renders correctly:

it('renders correctly', () => {
    const tree = renderer.create(
        <Component />
    ).toJSON();

    expect(tree).toMatchSnapshot();
});

4. Observe the error in the console

Invariant Violation: ReactCompositeComponent: injectEnvironment() can only be called once.

[gaearon]

Yes, 15.4.0 should fix it, this is indeed a React issue.