Improve automated tests

[santo-it]

Improve automated test suite by adding more databases:

• [x] movie
• [x] northwind
• [ ] reactome
• [ ] panama papers

and

• [ ] more asserts

[santo-it]

In version 2.2.24 two more databases (movie and northwind) have been added as part of the automated test suite.

To add the other big dbs, to check if these links help:

• https://help.github.com/articles/versioning-large-files/
• https://git-lfs.github.com/