Add unit tests for the Bitbucket class.
Add unit tests for the Bitbucket class.

balbuf/composer,erasys/composer,fabpot/composer,hirak/composer,till/composer,alcohol/composer,dzuelke/composer,nicolas-grekas/composer,davidolrik/composer,stefangr/composer,andrerom/composer,jreinke/composer,yaman-jain/composer,localheinz/composer,vdm-io/composer,composer/composer,SpacePossum/composer,naderman/composer,MoT3rror/composer,milleruk/composer,remicollet/composer,curry684/composer,pierredup/composer,staabm/composer,gencer/composer,stof/composer,johnstevenson/composer,fabiang/composer,floverdevel/composer,slbmeh/composer,phansys/composer,JBleijenberg/composer