Add integration test for index

[dawsonfi]

hey @rogeriochaves

Adding tests for Index endpoint with the template.

Since the other endpoints use database, i'm gonna do them in a separated PR because i'll have to do some researching on how to test them.

Hope you like it :)

[rogeriochaves]

Great! Maybe later we could extract the client for one that we could use in all tests, which might include db connection

[dawsonfi]

Great ideia, i'll do that refactor with the new tests