Stubbing private methods of SUT with sinon

[hellboy]

I should test public method that calls private method.

As I mentioned this private method

- should not be tested yet
- should not be called, but replaced with stub
- should be extracted to new object and made public. Now tests can be added

But I am not sure, if I SHOULD make this refactoring before, and mock this extracted public method, or I can still stub private method. Refactoring is not necessary to write test properly.

[hellboy]

Private functions can be also be tested and stubbed using rewire as folows

Comments are welcome.

See also Rewire-Expose Private in Tests