Create test cases for point generator and apis (?)

[EricKolibacz]

Point generators for plausibility should be straight forward.

Apis maybe a little more complex

• [ ] Create tests
• [ ] Add workflow for these tests
• [ ] Add badge to README

[EricKolibacz]

Shall the badge be a coverage badge? And if so, shall it be implemented via https://coveralls.io/?

[EricKolibacz]

An alternative to https://coveralls.io/ would be https://about.codecov.io/. Community [1] [2] doesn't seem to prefer any, so let's stick to coveralls.