Implement test for `generic.login`
Implement test for `generic.login`

Also, remove superfluous endpoint tests.

lukasjuhrich/sipa,agdsn/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,agdsn/sipa,agdsn/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,agdsn/sipa