Add tests for important features, to prevent regressions

[shreevatsa]

Right now, recognition of single pādas is broken! This was one of the most important features when building the site, so this is quite unfortunate. The next time I work on this (probably in December), need to establish a baseline of basic things that are supposed to work. by adding tests for them.

[gasyoun]

by adding tests for them

fully agree

[vvasuki]

Consider contributing to and expanding shared tests in https://github.com/sanskrit-coders/chandas/ .