Set the environment variable USER=root which is required by
brew tests --only=utils/user
Fix these tests:
rspec ./test/diagnostic_checks_spec.rb:26 # Homebrew::Diagnostic::Checks #check_access_directories
rspec ./test/pathname_spec.rb:120 # Pathname#ensure_writable makes a file writable and restores permissions
rspec ./test/utils/user_spec.rb:22 # User#gui? when the current user is in a console session gui? should equal true
rspec ./test/utils/user_spec.rb:6 # User should eq nil
When `brew cleanup` is run it prints out a message like the following:
> This operation has freed approximately 222M of disk space.
The '222M' refers to megabytes but the normal acronym for megabytes would be
'MB'. The 'B' is also missing from kilobytes and gigabytes in the output, so
that's what this commit adds.
