How do I see what preconditions weren't matched in an account update?

[L-as]

Using test_zkapp_command from src/lib/transaction_snark/test/util.ml.
Currently I get the following somewhat unhelpful message:

"Application failed. Failure statuses: (() (Cancelled) (Cancelled) (Account_proved_state_precondition_unsatisfied))"

[L-as]

Nevermind, I just realised I misunderstood it. Of course, it's failing because the state isn't proven.