Refactor and fix RuboCop specs.

Library/Homebrew/rubocops/checksum_cop.rb

Library/Homebrew/rubocops/conflicts_cop.rb

Library/Homebrew/rubocops/extend/formula_cop.rb

Library/Homebrew/rubocops/formula_desc_cop.rb

Library/Homebrew/rubocops/lines_cop.rb

Library/Homebrew/test/rubocops/bottle_block_cop_spec.rb

Library/Homebrew/test/rubocops/caveats_cop_spec.rb

Library/Homebrew/test/rubocops/checksum_cop_spec.rb

Library/Homebrew/test/rubocops/class_cop_spec.rb

Library/Homebrew/test/rubocops/components_order_cop_spec.rb

.../Homebrew/test/rubocops/components_redundancy_cop_spec.rb

Library/Homebrew/test/rubocops/conflicts_cop_spec.rb

Library/Homebrew/test/rubocops/formula_desc_cop_spec.rb

Library/Homebrew/test/rubocops/homepage_cop_spec.rb

Library/Homebrew/test/rubocops/lines_cop_spec.rb

Library/Homebrew/test/rubocops/options_cop_spec.rb

Library/Homebrew/test/rubocops/patches_cop_spec.rb

Library/Homebrew/test/rubocops/text_cop_spec.rb

Library/Homebrew/test/rubocops/urls_cop_spec.rb

Library/Homebrew/test/spec_helper.rb