/usr/share/installed-tests/gjs/jsunit.test is in gjs-tests 1.39.91-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Test]
Type=session
Exec=/usr/lib/gjs/gjs/installed-tests/jsunit
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