I am developing some tests for my code (using the testing package), and I am wondering what's the best way to mock functions inside the tested function:
Should I pass the function as parameter? In that case, what if that function calls another function? Should I pass both the first and second function as parameters in the tested one?
Note: some of the functions are called on objects (i.e. someObj.Create()) and use HTTP API calls.
UPDATE for clarification:
Example: functions
func f1() error {
... //some API call
}
func (s *SomeStruct) f2() error {
return f1
}
func f3() error {
return nil
}
func f4() error {
...
err = obj.f2()
...
err = f3()
...
}
For the above: if I want to test f4, what's the best way to mock f2 and f3?
If I pass f2 and f3 to f4 as parameters it would work, but then what for the f2 test? Should I pass f1 to f2 as parameter?
And if that's it, should then f4 have f1 as well in the parameters?