EXASLCT: Test output should be streamed to log file

[tkilias]

Background

• We write the standard output and error for the language container tests only after they have finished
• However, for long-running or if the system fails, it would be good to write them as soon the output is available
• Basically, return a stream from the exec_run at the following position and write it directly to a file

script-languages-container-tool/exasol_script_languages_container_tool/lib/tasks/test/run_db_test.py

Line 74 in 8c15428

exit_code, output = test_container.exec_run(cmd=bash_cmd,

• See ContainerLogger https://github.com/exasol/integration-test-docker-environment/blob/master/exasol_integration_test_docker_environment/lib/logging/container_log_handler.py