Don't reject promises until mock functions are called #14
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jest-when has the same issue as jestjs/jest#5721 (which was fixed in jestjs/jest#5720) -
mockRejectedValue
causes an error if the mock function is called asynchronously, because the returned promise was rejected immediately.This PR changes
mockRejectedValue[Once]
to defer the promise rejection until the mock function is actually called.