Outputting logging to INFO from a successful Test in Gradle

I have some Spock tests running on JUnit 4.12 in Gradle 6.1.1.

Right before the forked test JVM runs, DefaultExecHandle logs to INFO:

Starting process …

Where … is some more text.

If a test fails, that logging statement is saved in the test report. If a test succeeds, however, that logging statement is not saved in the report.

How can I get that logging statement saved / output somewhere when the test succeeds?