Use scoped RSpec matchers.

Library/Homebrew/build_environment.rb

Library/Homebrew/formula.rb

Library/Homebrew/requirement.rb

Library/Homebrew/test/bash_spec.rb

Library/Homebrew/test/bottle_hooks_spec.rb

Library/Homebrew/test/build_environment_spec.rb

Library/Homebrew/test/build_options_spec.rb

Library/Homebrew/test/compiler_failure_spec.rb

Library/Homebrew/test/dependable_spec.rb

Library/Homebrew/test/dependency_collector_spec.rb

Library/Homebrew/test/dependency_spec.rb

Library/Homebrew/test/dev-cmd/audit_spec.rb

Library/Homebrew/test/formula_installer_bottle_spec.rb

Library/Homebrew/test/formula_installer_spec.rb

Library/Homebrew/test/formula_spec.rb

Library/Homebrew/test/os/mac/dependency_collector_spec.rb

Library/Homebrew/test/requirement_spec.rb

Library/Homebrew/test/sandbox_spec.rb

Library/Homebrew/test/software_spec_spec.rb

Library/Homebrew/test/tab_spec.rb