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This adds jsonschema tests to all test cases, without bringing these checks into the normal server or client code at runtime. It works by creating a MITM proxy server that inspects all JSON and CBOR traffic on the way past, validating against either a request or response schema.
The schema check needs a little more work:
Requests/response inspection is only skin deep - it does not check, for example, metadata descriptions
Error returns when schema checks fail are piped through the proxy's HTTP response to the server - which is fairly cheeseball