postgresql integration tests

[lwsanty]

Signed-off-by: lwsanty lwsanty@gmail.com

[jfontan]

There's a regression in the coverage, can you take a look? Could it be related with GITHUB_TOKEN not being available? Travis hides secret tokens to PRs done from other repositories. You can make use of the token if you push the branch to the repository and you create the PR from it.

It would be nice that the integration test uses a temporary database for each test. This makes local testing easier as you don't have to delete the database before each test. We are already doing in data-retrieval and I believe the code could be copied almost verbatim:

https://github.com/src-d/data-retrieval/blob/master/test/database.go

[lwsanty]

@jfontan i think most probably the regression error is related to token, should I create new PR after I push to the branch of this repo?

[jfontan]

@lwsanty yes, upload to a branch in this repo and create a new PR.

[lwsanty]

closing this one because new PR was created #77