- Add TestBasicSchemaDecodeEncode with working Avro schema tests
- Test core decode/encode functionality with real Schema Registry mock
- Test cache performance and consistency across multiple decode calls
- Add TestSchemaValidation for error handling and edge cases
- Verify Confluent envelope parsing and reconstruction
- Test non-schematized message detection and error handling
- All tests pass with current schema manager implementation
Note: JSON Schema detection as Avro is expected behavior - format detection
will be improved in future phases. Focus is on core Avro functionality.
