colcon test puts reports where?

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With catkin, I can run tests and check results like so:

$ catkin run_tests --workspace $CATKIN_WS ; catkin_test_results $CATKIN_WS

These commands would produce junit-compliant reports satisfying the following FileSet globbing expressions:

• **/*gtest-*.xml
• **/*rostest-*.xml
• **/*rosunit-*.xml

The seemingly equivalent invocations for colcon, namely

$ colcon test ; colcon test-result --all

do not produce any reports satisfying the aforementioned FileSet.

How do I tell colcon to produce junit-compliant reports? Where does colcon write those reports?

References:

• Java FileSet: https://ant.apache.org/manual/Types/f...
• catkin running unit tests: https://docs.ros.org/en/melodic/api/c...
• colcon verb test: https://colcon.readthedocs.io/en/rele...
• colcon verb test-result: https://colcon.readthedocs.io/en/rele...