tests: add integration tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 61.53846% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
test/test.go	61.53%	5 Missing and 5 partials :warning:

Files with missing lines	Coverage Δ
test/test.go	61.53% <61.53%> (ø)

... and 23 files with indirect coverage changes