Add public CI and code coverage tracking

[andreihh]

Hi! I really like this library and it would be really useful in a tool I develop (right now I use picocli but that's a bit cumbersome in Kotlin), but I'm a bit reluctant to adopt Clikt.

Right now, there is no public information regarding how well-tested is Clikt (I could go through the codebase and tests, but that's time consuming).

I would really appreciate if you could add at least some public continuous integration and code coverage tracking (Gradle with Jacoco and any of the free-for-open-source services like Codecov and Travis-CI would be fine). I would like to know that the library is reasonably tested and stable and that you intend to support it before committing to use it in my projects.

Let me know what are your plans with the library. Thanks!

[ajalt]

I'm glad you like it! I added travis in #4. Jacoco doesn't work well with kotlin, (it doesn't understand inline functions etc.), so I didn't add it as part of CI.

Clikt is very thoroughly tested. It currently has over a hundred tests, which are heavily parameterized. It has nearly complete code coverage, but more importantly, I aim for comprehensive case coverage. For example, the tests for the counted modifier, (a three line function), have 19 different cases that are tested. There are 1.6x as many lines of test code as source code.

Hopefully that gives you enough confidence to try this library out. I plan on supporting it indefinitely.

[andreihh]

Thanks for the answer! I'll give the library a try :)