How to debug a vim plugin?

Hi,

I am wondering how to debug a vim plugin (for example, the following
one) in an efficient way.

https://github.com/Clavelito/indent-sh.vim/blob/master/indent/sh.vim

The main difficulty that I see is that a vim plugin is different from
a typical program is that in a typical programming language one can
easily isolate a piece of code and insert print statements. But in a
vim plugin, since it causes some effects in the code shown in vim, I
am not sure how a print statement can help much.

Also, in a regular programming language, one can run a function with
different parameters, then check its behavior. But a vim plugin is
just a whole piece of code, it is not clear how to run a piece of code
in an isolated environment to inspect its behavior.

Does anybody have any tips on how to debugging vim plugins? Thanks.

--
Regards,
Peng

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