mockRejectedValue causes unhandled rejection

[javinor]

Do you want to request a feature or report a bug?

bug - I opened a PR to fix this

What is the current behavior?

Using mockFn.mockRejectedValue(value) causes a misleading unhandled rejection. This doesn't happen when using an equivalent mockFn.mockImplementation(fn), and is not immediately obvious why this happens.

If the current behavior is a bug, please provide the steps to reproduce and
either a repl.it demo through https://repl.it/languages/jest or a minimal
repository on GitHub that we can yarn install and yarn test.

https://github.com/javinor/mock-rejected-value-causes-unhandled-rejection

What is the expected behavior?

To not throw an unhandled rejection

Please provide your exact Jest configuration and mention your Jest, node,
yarn/npm version and operating system.

Jest 22.4
Node v9.7.1
Mac OSX

[github-actions]

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