Add unit tests and add makefile

[shashimalcse]

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[pavinduLakshan]

Just to confirm, would this run the tests for both Go versions? If so, I personally think it might not be necessary.

[shashimalcse]

I think, this is used by the community and we have to maintain the compatibility.

[Copilot]

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• Makefile: Language not supported

[Copilot]

[nitpick] The use of the global 'publicKeys' map in tests may lead to interference between tests. Consider isolating or resetting the global state in each test to avoid potential non-deterministic outcomes.

Suggested change

	publicKeys = map[string]*rsa.PublicKey{}
	}
	publicKeys = make(map[string]*rsa.PublicKey)