NewPrefixJournal creates an instance of PrefixJournal with the specified underlying journal and prefix.

NewSimpleJournal creates an instance of SimpleJournal.

PrefixJournal is an implementation of Journal interface that prefixes every item passed to it with the specified prefix before passing it on to the underlying Journal.

SimpleJournal is an implementation of Journal that has methods for waiting for particular events and verifying journal contents.

Journal records a series of events (items) represented as strings in a thread-safe way.