File system and objects are not auto loaded on Ruby 3.0.4 about fakefs

[grosser]

A workaround would be to load everything before enabling fakefs (Dir.glob + require maybe)
If the behavior changed between ruby versions then I think that means that the old ruby used some internal api and the new version uses File.read or some other fakefs method.
It could help narrowing this down by making a simple example file (using bundler/inline) to reproduce this in 2 ruby versions ... I'd expect one of them to call some internal FakeFS method and the other to not do that.

[tovodeverett]

I'm surprised you haven't run into this issue before. I've been having to clone since the dawn of time (Rails 4.x?).

I have no memory of how this code works - I wrote this 8+ years ago, but here it is in case it helps. This is from spec_helper.rb:

# Support FakeFS helpers
require 'fakefs/spec_helpers'
require 'pp' # Resolves https://github.com/defunkt/fakefs/issues/215, https://github.com/defunkt/fakefs/issues/99

# Support for FakeFS::SpecHelpers::Rails
module FakeFS
  module SpecHelpers
    module Rails
      def self.extended(example_group)
        example_group.use_fakefs_rails(example_group)
      end

      def self.included(example_group)
        example_group.extend FakeFS::SpecHelpers
        example_group.extend self
      end

      def use_fakefs_rails(describe_block)
        describe_block.before :each do
          unless FakeFS::FileSystem.unarchive(:rails)
            FakeFS::FileSystem.clone(::Rails.root.join('app'))
            FakeFS::FileSystem.clone(::Rails.root.join('config'))
            FakeFS::FileSystem.clone(::Rails.root.join('public'))
            FakeFS::FileSystem.clone(Gem.loaded_specs['jquery-rails'].full_gem_path)
            FakeFS::FileSystem.clone(Gem.loaded_specs['coffee-script-source'].full_gem_path)
            FileUtils.mkdir_p('/tmp')
            FakeFS::FileSystem.archive(:rails)
          end
        end
      end
    end
  end
end

Then I just use include FakeFS::SpecHelpers::Rails in my rspec contexts.

The cool thing there is by using archive, I amortize the cost of cloning huge chunks of my Rails app across all the tests that need FakeFS.

[grosser]

nice trick!

[alishersadikov]

A workaround would be to load everything before enabling fakefs (Dir.glob + require maybe) If the behavior changed between ruby versions then I think that means that the old ruby used some internal api and the new version uses File.read or some other fakefs method. It could help narrowing this down by making a simple example file (using bundler/inline) to reproduce this in 2 ruby versions ... I'd expect one of them to call some internal FakeFS method and the other to not do that.

Thanks for a quick reply and sorry it took me a while to get back. Thanks for the suggestions. Using bundler/inline, there is probably a way to see what methods are called internally, but I have been scratching my head about that.

[alishersadikov]

I'm surprised you haven't run into this issue before. I've been having to clone since the dawn of time (Rails 4.x?).

I have no memory of how this code works - I wrote this 8+ years ago, but here it is in case it helps. This is from spec_helper.rb:

# Support FakeFS helpers
require 'fakefs/spec_helpers'
require 'pp' # Resolves https://github.com/defunkt/fakefs/issues/215, https://github.com/defunkt/fakefs/issues/99

# Support for FakeFS::SpecHelpers::Rails
module FakeFS
  module SpecHelpers
    module Rails
      def self.extended(example_group)
        example_group.use_fakefs_rails(example_group)
      end

      def self.included(example_group)
        example_group.extend FakeFS::SpecHelpers
        example_group.extend self
      end

      def use_fakefs_rails(describe_block)
        describe_block.before :each do
          unless FakeFS::FileSystem.unarchive(:rails)
            FakeFS::FileSystem.clone(::Rails.root.join('app'))
            FakeFS::FileSystem.clone(::Rails.root.join('config'))
            FakeFS::FileSystem.clone(::Rails.root.join('public'))
            FakeFS::FileSystem.clone(Gem.loaded_specs['jquery-rails'].full_gem_path)
            FakeFS::FileSystem.clone(Gem.loaded_specs['coffee-script-source'].full_gem_path)
            FileUtils.mkdir_p('/tmp')
            FakeFS::FileSystem.archive(:rails)
          end
        end
      end
    end
  end
end

Then I just use include FakeFS::SpecHelpers::Rails in my rspec contexts.

The cool thing there is by using archive, I amortize the cost of cloning huge chunks of my Rails app across all the tests that need FakeFS.

This looks nice! We have a rudimentary, now inefficient way of doing this, by using a helper method:

def within_stubbed_fs
    # some cruft here
    FakeFS.with_fresh do
       # now I have to clone the file system here 
       yield 
    end 
end 

I search for archive/unarchive methods and they don't seem to be in the source code. But I found the issue you had created @tovodeverett: #170, so maybe I can try to mimic that.