Merge pull request #54 from Rutherther/test/packet-files

Add tests working with packet files

tests: remove unnecessary deep checks, replace them with ShouldBeEquivalentTo from Shouldly

tests: update, fix tests

tests: fix tests for new version

Merge pull request #47 from Rutherther/feat/pass-nullable

Pass CanBeNull to string serializer and converter

chore(test): update tests

feat(tests): add clist packet tests