Neo4j::Community.load_test_jars! Neo4j::Session.register_db(:impermanent_db) do |*args| Neo4j::Embedded::EmbeddedImpermanentSession.new(*args) end module Neo4j module Embedded class EmbeddedImpermanentSession < EmbeddedSession def start fail Error, 'Embedded Neo4j db is already running' if running? # puts "Start test impermanent embedded Neo4j db at #{db_location}" @graph_db = Java::OrgNeo4jTest::TestGraphDatabaseFactory.new.newImpermanentDatabase Neo4j::Session._notify_listeners(:session_available, self) end end end end