set the condition set, if not set overwrite, if set.

unset the condition.

copy the operations from the parent Expect-block.

start with a empty set of operations.

close a Expect block closing a Expect block restores the state of the previous Expect block for the following messages :returns: :protobuf:msg:`Mysqlx::Ok` on success, :protobuf:msg:`Mysqlx::Error` on error.

open an Expect block and set/unset the conditions that have to be fulfilled if any of the conditions fail, all enclosed messages will fail with a Mysqlx.Error message.