All images should be tested with a sample hover/definition call

[chrismwendt]

This would give us a sanity check that the images actually work. Maybe we could use lsp-record #37 😄

[keegancsmith]

Yup, I meant to add a basic test for all languages. The point of the tool is then to easily just do lsp-record test haskell and if it says yet you know it is still working.