How to add Mac-specific gems to bundle on Mac but not on Linux?

Question

I\'m developing a Rails app on a Mac, and I\'m new to testing, so I just added these gems to my Gemfile:

group :test, :development do
  gem          


        

Answer 1

You can use :install_if method which accepts arbitrary lambda.

Following example comes directly from Gemfile's man pages:

install_if -> { RUBY_PLATFORM =~ /darwin/ } do
  gem "pasteboard"
end

It is much better than control flow constructs (e.g. if) as it maintains dependencies correctly and keeps Gemfile.lock uniform on all machines.