more testing

.../org/briarproject/bramble/contact/ContactManagerImpl.java

.../org/briarproject/bramble/mailbox/MailboxServiceImpl.java

...ject/bramble/mailbox/sessions/AbstractMailboxSession.java

...ect/bramble/mailbox/sessions/FeedableSyncInputStream.java

.../org/briarproject/bramble/sync/DuplexOutgoingSession.java

...n/java/org/briarproject/bramble/sync/IncomingSession.java

...iarproject/bramble/transport/TransportKeyManagerImpl.java

.../briarproject/briar/mailbox/IntroduceeProtocolEngine.java

...rproject/briar/mailbox/MailboxIntroductionCryptoImpl.java

...project/briar/mailbox/MailboxIntroductionManagerImpl.java

...rproject/briar/mailbox/MailboxIntroductionCryptoImpl.java

...org/briarproject/briar/mailbox/MailboxProtocolEngine.java