Test the number of rounds to 'reduce' pathological case
Test the number of rounds to 'reduce' pathological case

If an expected failure depends on a large number of the passing examples, the
subset enumeration strategy can take a large number of rounds to minimise the
run.

Add a test to count rounds in the worst case, where a failure depends on all
of the preceding examples. With 8 candidates preceding a failure, a recursive
strategy could return in 15 rounds (1 + 2 + 4 + 8).

dg-ratiodata/rspec-core,azbshiri/rspec-core,behnaaz/rspec-core,pandabrand/rspec-core,xmik/rspec-core,edwardpark/rspec-core,yaoshipu/rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,h4ck3rm1k3/rspec-core,azbshiri/rspec-core,rspec/rspec-core,leg100/rspec-core,a-suenami/rspec-core,danascheider/rspec-core,SoldierCoder/rspec-core,azbshiri/rspec-core,a-suenami/rspec-core,irfanah/rspec-core,iguchi1124/rspec-core,h4ck3rm1k3/rspec-core,behnaaz/rspec-core,pandabrand/rspec-core,leg100/rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,edwardpark/rspec-core,h4ck3rm1k3/rspec-core,a-suenami/rspec-core,arronmabrey/rspec-core,xmik/rspec-core,edwardpark/rspec-core,arronmabrey/rspec-core,rspec/rspec-core,maclover7/rspec-core,maclover7/rspec-core,yaoshipu/rspec-core,danascheider/rspec-core,irfanah/rspec-core,avantcredit/rspec-core,arronmabrey/rspec-core,irfanah/rspec-core,SoldierCoder/rspec-core,maclover7/rspec-core,iguchi1124/rspec-core,avantcredit/rspec-core,leg100/rspec-core,iguchi1124/rspec-core,SoldierCoder/rspec-core,yaoshipu/rspec-core,danascheider/rspec-core,xmik/rspec-core,behnaaz/rspec-core,rspec/rspec-core,avantcredit/rspec-core,pandabrand/rspec-core,dg-ratiodata/rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,dg-ratiodata/rspec-core