Mocking Nested Functions

[rushmakes]

Sorry I couldn't find the solution to this problem.
So I am writing a unit test for a sensor API. The API has a sensor.c, sensor.h and sensor_types.h file.
sensor.c has various functions needed to access the sensor, these functions are declared in the sensor.h and sensor_types.h has some constants. Also, there are HAL files for i2c communication.
Now, the real problem here is, consider the function given below, sensor_init, funcA and funcB all are in same file sensor.c.
eg: int8_t sensor_init(some struct){
funcA{}
i2c_read()
funcb{}
i2c_write()
}

I was able to write unit tests and test the funcA and funcB as they don't depend on anything else. Also, for the i2c_read and write I was able to write unit tests.
My problem is writing unit test for sensor_init, I cannot directly mock funcA and funcB as they belong to the same file.
I tried creating a dummy header file containing the declaration of dummy_funcA and dummy_funcB, and mocking this header into the test file. I changed the name to avoid conflict. Is this a right approach.?
Also I don't understand how to handle this nested function situation? Any clue would be very helpful

[JuPrgn]

This can be usefull #604
ThrowTheSwitch/CMock#365

[mkarlesky]

Closing this issue to cull open issues. Issue #936 collects issues related to this one.