Create tests to validate HSMS communication integrity

[bparzella]

As the code and the unit-tests are developed in the same scope, this has potential for breaking the communication without noticing it.

There should be some integration or e2e tests, to make sure the communication / encoding is still working as expected. This can either be done using

• An external tool: Is there any tool that is officially usable and affordable for an open source project?
• A self created tool: Some kind of service (docker?) that runs with an older, "stable" version of this package