pyprep needs to be split into smaller, testable chunks

[sappelhoff]

we need to refactor much of the code to be in smaller chunks (functions, preferably) that can be properly tested with pytest.

that'd make everyone more comfortable when we change pyprep behavior, like suggested in #19

[yjmantilla]

Do you mean functions as in don't overuse classes? In that regard I agree. Sometimes they add a layer of abstraction that could be avoided.

Nevertheless because we have a lot of parameters it sometimes requires passing a lot of arguments (or a dictionary) to the functions and it gets a little bit ugly to the eyes.

In our particular case I would think about making the find_noisy_channels criteria methods into functions of the module that the Noisy Channels class calls. That way they would be less dependent of each other and could be tested in an easier way (and potentially be used in other contexts?). Right now though the test file of find_noisy_channels doesn't seem that convoluted so maybe this is unnecesary (?).

The other two critical things are the perform_reference and the robust_reference methods. Maybe it would be worth while to make deeper tests for these ones whether we refactor or not into a more functional style.

[a-hurst]

@sappelhoff With @yjmantilla's functional RANSAC and the NoisyChannels tests being broken into simpler chunks in #84, what do you think is left for this issue? Factoring out adaptive line noise filtering and post-rereference interpolation as discussed in #73 comes to mind (would be necessary for writing MATLAB-equivalence tests for either), but is there anything else you can think of?

[sappelhoff]

Factoring out adaptive line noise filtering and post-rereference interpolation as discussed in #73 comes to mind (would be necessary for writing MATLAB-equivalence tests for either)

+1, but apart from that, I think your recent efforts have left us well covered, especially with the matprep CI :-)

I think this one can be closed once #73 is closed.

[yjmantilla]

I agree with both, with #73 this should be closed.