implement authentication related tests

[latour-gui]

No description provided.

[latour-gui]

I am struggling with the cfg(test) attribute.

What I thought to be the solution cannot be used with integration tests : rust-lang/rust#45599

So back to start where I have to find a solution for taking a different database when executing cargo test and cargo run

[latour-gui]

• test register without address
• test register with address ok
• test register with addresse not ok
• test register existing email
• test double register same address
• test activation good code good id
• test activation wrong code good id
• test activation good code wrong id
• test activation wrong code wrong id
• test double activation
• test login inactive account good logins
• test login inactive account wrong logins
• test login active account good logins
• test login active account wrong logins