Classes and modules

PG
PG::AuthenticationError
PG::Backend
PG::Config
PG::Connection
PG::ConnectionError
PG::Error
PG::Field
PG::Frontend
PG::Lease
PG::MessageReader
PG::Notification
PG::NullError
PG::Pool
PG::PoolTimeout
PG::ProtocolError
PG::Result
PG::Row
PG::Scram
PG::ServerError
PG::StatementCache
PG::StatementCache::Snapshot
PG::Testing
PG::Testing::Server
PG::Testing::Unavailable
PG::TransactionError
PG::Types
PG::Wire
PG::Wire::Reader

`class PG::Testing::Unavailable < PG::Error`

Neither PG_TEST_URL nor the server's programs to make a cluster.

src/testing.qz:45