nim CI doesn't actually test this package

[timotheecour]

same issue as tulayang/asyncmysql#5
either a test task needs to be defined or a tests folder needs to exist.
nim -r c fresnel_test.nim is not run by nim CI (nor nimble test)

if you need more info, see this other answer: flyx/NimYAML#80 (comment)

[dvolk]

Thanks for reporting. Fresnel_test.nim is not a unit test. It's an example.