On Friday, April 19, 2013 10:12:48 PM UTC+5:30, abid rahman wrote:

Hi,

1 - I had send a PR on histogram backprojection. at that time travis build was successful.

Then i made some modifications for PEP8, but travis build shows errors which i don't understand. https://travis-ci.org/scikit-image/scikit-image/jobs/6472929.

But i haven't changed any functionality of code and it works fine in my system as good as old.

2 - Also, I didn't get the concept of writing of tests for my code. What actually the tests do and how should I write a good test code?

Writing test-driven code is a feature of high quality software design, something that I learnt recently while contributing to open source :) . Writing tests ensures that when new code is merged, no part of the previous code is broken i.e the tests for the functions in the existing code ensure that your contribution does not change the behavior of existing code in anyway. Good tests are the ones that are easily verifiable by another developers and are tested with small and simple data so that test time is kept at a minimum, while still checking some important properties of the functions( that you are adding). Maybe other experienced members in the community can add more to this. Thank you. Regards, Ankit Agrawal, Communication and Signal Processing, IIT Bombay.