add unit/integration test

[chinmayb]

I got to know about the project from Nithin's tweet. So wanted to know more about the project. When going through the code base, I thought we could add some tests.

I added some tests here chinmayb#1 . Its just a couple of tests to begin with and contains a minor fix. We could add more in the upcoming commits/PRs. It brings up postgres as docker container during tests. Let me know your thoughts, I will raise the PR here if the approach seems fine, Thanks!

[knadh]

Hi @chinmayb. Please do send the PR. Thanks!

[chinmayb]

Great, here #36