We can test the completeness of SPM-3895 goal 1 on our passthrough suites. To accomplish that we need to:

1. set TestData.logFormat: "json" in a new passthrough suite and
2. override the 'print()' method and assert that its input is either a log-entry object in the correct format or a string conforming to a log-entry object.

It should be non-problematic to run such a passthrough suite in a patch build.
It might be tricky to run such a suite in waterfall, as the error detection might not-yet work correctly on the new log format.