Difference between shims and stubs

Question

Can anyone tell me very clearly what\'s the main difference between a shim and a stub during unit testing?

I know about mock objects and I

Answer 1

From what I understood, the difference is where the mocked code resides or which part of code you mocked (i.e. the "where" gives the distinction). So I would put it as:

You call Stub the part of your code which you mocked while it will be called Shim if you mock some external call.

• "your code" being the code to be tested
• "external call" is the dependency on which your code depends

I found this reference good: My two cents on fakes, stubs, mocks, and shims esp the part "A general rule is to take advantage of stubs for internal calls and shims for external assemblies."