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This new test mocks both the user agent (e.g. browser) and the push service (e.g. Firestore) to verify that encryption and decryption works properly.
I used the RFCs as reference (RFC8291, RFC8292 & RFC 8188), but didn't follow them to the letter. The result can successfully check all the signatures and decrypt the content, so it seems to be working.
Instead of the deprecated crypto/elliptic functions, this makes heavy use of crypto/ecdh, which require Go 1.20. But this is only a test dependency, library users should not be impacted.
I wanted to have these tests before I attempt migrating the library itself from crypto/elliptic to crypto/ecdh, to avoid regressions. There'll be a followup PR later to replace deprecated functions.