```ruby
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/common', __FILE__)
require File.expand_path('../shared/chroot', __FILE__)

platform_is_not :windows do
  not_supported_on :jruby do
    as_superuser do
      describe "Dir.chroot as root" do
        it_behaves_like :dir_chroot_as_root, :chroot
      end
    end

    platform_is_not os: :cygwin do
      as_user do
        describe "Dir.chroot as regular user" do
          before :all do
            DirSpecs.create_mock_dirs
          end

          after :all do
            DirSpecs.delete_mock_dirs
          end

          it "raises an Errno::EPERM exception if the directory exists" do
            lambda { Dir.chroot('.') }.should raise_error(Errno::EPERM)
          end

          it "raises a SystemCallError if the directory doesn't exist" do
            lambda { Dir.chroot('xgwhwhsjai2222jg') }.should raise_error(SystemCallError)
          end

          it "calls #to_path on non-String argument" do
            p = mock('path')
            p.should_receive(:to_path).and_return('.')
            lambda { Dir.chroot(p) }.should raise_error
          end
        end
      end
    end

    platform_is os: :cygwin do
      as_user do
        describe "Dir.chroot as regular user" do
          it_behaves_like :dir_chroot_as_root, :chroot
        end
      end
    end
  end
end
```

Remove not_supported_on which can be replaced by tags
user
```ruby
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/common', __FILE__)
require File.expand_path('../shared/chroot', __FILE__)

platform_is_not :windows do
  as_superuser do
    describe "Dir.chroot as root" do
      it_behaves_like :dir_chroot_as_root, :chroot
    end
  end

  platform_is_not os: :cygwin do
    as_user do
      describe "Dir.chroot as regular user" do
        before :all do
          DirSpecs.create_mock_dirs
        end

        after :all do
          DirSpecs.delete_mock_dirs
        end

        it "raises an Errno::EPERM exception if the directory exists" do
          lambda { Dir.chroot('.') }.should raise_error(Errno::EPERM)
        end

        it "raises a SystemCallError if the directory doesn't exist" do
          lambda { Dir.chroot('xgwhwhsjai2222jg') }.should raise_error(SystemCallError)
        end

        it "calls #to_path on non-String argument" do
          p = mock('path')
          p.should_receive(:to_path).and_return('.')
          lambda { Dir.chroot(p) }.should raise_error
        end
      end
    end
  end

  platform_is os: :cygwin do
    as_user do
      describe "Dir.chroot as regular user" do
        it_behaves_like :dir_chroot_as_root, :chroot
      end
    end
  end
end
```
assistant