Fix rubocop in spec/helpers/diff_helper_spec.rb
Fix rubocop in spec/helpers/diff_helper_spec.rb

mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,iiet/iiet-git,dreampet/gitlab,dreampet/gitlab,axilleas/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab