X_TEST_ISLAND_STATES_EMPTY
Means
an island state manifest declares no states
Typical cause
defineIslandStates was given states: [] — it parses, it registers and it expands to nothing, so the command that photographs it produces no file and exits 0, which is the one outcome a reader cannot tell from success
Fix
in the states file the cause names add a state: states: [{ id: 'empty', title: 'no rows yet', props: {} }]