React modules executed twice?

[angusfretwell]

When testing React components with Jest, I receive Warning: ReactComponentTreeDevtool: Missing React element for debugID 1 when building stack is shown when calling TestUtils.renderIntoDocument. I filed an issue on React, and @gaearon identified that this was caused by Jest executing React modules twice.

Not sure if this is expected behaviour?

See the issue on React for more information and the repo I put together to reproduce the issue: https://github.com/angusfretwell/reproduce-debugid-warning (npm install && npm test).

[cpojer]

I'm reopening the React issue, this is not related to Jest.

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