Allow Generated Mocks to Accept Other Mock Interfaces as Input to Avoid Cyclic Imports

[kAvEh--]

Requested feature
Consider two interfaces, InterfaceA and InterfaceB. InterfaceA has a function that takes an object of InterfaceB as input. I want to generate MockInterfaceA, with the function accepting MockInterfaceB as input instead of InterfaceB.

Why the feature is needed
If the generated mock files are placed in a separate folder, and the mocked interface is used in a test file located in the main package, it will result in a cyclic import: main package -> mock package -> main package.

[tulzke]

Here is a simple example why this does not work:
example.zip

TL;DR:
// compilation error
// Type HumanMock does not implement Human
// need the method: Call(dog Dog)
// have the method: Call(_ DogMock)
var human Human = mock.HumanMock{}

[tulzke]

Possible solutions to the problem:

1. Generate mocks to the same directory as interfaces.
2. Use the _test postfix for package in tests. Then the dependency graph will look like this:

flowchart LR

some_package
mock --> some_package
some_package_test --> some_package
some_package_test --> mock

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