mockImplementationOnce doesn't mock constructor, mockImplementation does

[ashfurrow]

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

Bug.

What is the current behavior?

So I noticed that when mocking constructors, mockImplementation() will work as I expect (it mocks the implementation), but calling mockImplementationOnce() does not mock the implementation.

You can see the bug here: https://repl.it/MCyG/3 if you change mockImplementationOnce in thing.test.js to mockImplementation, then the test will pass.

What is the expected behavior?

I would expect mockImplementationOnce to work like mockImplementation, except it only mocks it once.

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

macOS 10.13, Jest 21.2.1, Yarn 0.24.5, Node 6.10.2.

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