We should do several things (or ensure that they are already done) to improve our authentication tests. Do one separate PR for each item, one by one:

• enable "old" authentication in all existing configurations;
• enable PostgreSQL authentication (disable trust); Enable PostgreSQL authentication #784
• add matrix configurations for new authentication and dotnet/java/python examples; Test new authentication on CI #771
• update examples to use stable/strict API based on the value of CLI parameters;
• add matrix configurations for stable/strict API enabled.