add a new test file t/integration/finishblock.t
add a new test file t/integration/finishblock.t

This one is meant to prevent further accidental mis-nestings like
the ones fixed in 179e9ac38eb1fe65ce97a38fb838ec15fe24cc8f and
c076817b222e6d4a85ed0fd85f60236bc11d4bd4.

masak/007,masak/007,masak/007