Does this refer to the connection between automated tests in Java and Python?

The connection between automated tests in Java and Python is usually implemented through integration of testing frameworks or common interfaces for execution and reporting. For example, REST API can be used to run tests written in different languages or to combine results into a single report.

Data exchange can also be done via files (JSON, XML) or message brokers (RabbitMQ, Kafka), so that tests in one language can influence the state checked by tests in another.

Example: running Python tests from Java code via command line call or REST request to a testing service.