Simon,
I noticed that under sandbox, "ut dm" needs sandbox to have been started with arch/sandbox/dts/test.dtb. A few questions related to that:
a) Is it safe and does it make sense to always use that DT when running Sandbox for tests (e.g. under test/py)?
b) Does it make sense for that DT to be the default (perhaps bundled into the executable like other DT-using platforms, or perhaps the default value for the -d option if the user supplies none)?
c) Is it possible for "ut dm" to detect if the correct DT has been loaded (e.g. by reading some property only in that file as a marker) and only execute tests that don't rely on test.dtb if test.dtb isn't in use?
I think running "ut env" and "ut time" under test/py should be very easy, although the test log will only report overall status, not the status of each individual test within the ut invocation. That information will still be in the log file though. I'll go add tests for those two at least.