enebo: headius I don't have any confidence in my understanding of your instructions about git bisect for the test: heinrich@berlin:~/mck/neo4j$ type jruby jruby is hashed (/Users/heinrich/mck/jruby/bin/jruby) heinrich@berlin:~/mck/neo4j$ jruby -v jruby 9.2.9.0 (2.5.7) 2020-02-25 458ad3e Java HotSpot(TM) 64-Bit Server VM 11.0.6+8-LTS on 11.0.6+8-LTS +jit [darwin-x86_64] heinrich@berlin:~/mck/neo4j$ jruby -S rspec Coverage may be inaccurate; set the "--debug" command line option, or do JRUBY_OPTS="--debug" or set the "debug.fullTrace=true" option in your .jrubyrc /Users/heinrich/.rvm/gems/jruby-9.2.10.0/gems/simplecov-0.18.4/lib/simplecov.rb:345: warning: tracing (e.g. set_trace_func) will not capture all events without --debug flag