load.rb

# goes into spec/ruby/core/kernel/shared/load.rb
describe :kernel_load, :shared => true do

  # ...

  describe "when passed true for 'wrap'" do
    it "loads from an existing path" do
      path = File.expand_path "wrap_fixture.rb", CODE_LOADING_DIR
      @object.load(path, true).should be_true
    end

    it "sets the enclosing scope to an anonymous module" do
      path = File.expand_path "wrap_fixture.rb", CODE_LOADING_DIR
      @object.load(path, true)

      Object.const_defined?(:LoadSpecWrap).should be_false
    end

    it "allows referencing outside namespaces" do
      path = File.expand_path "wrap_fixture.rb", CODE_LOADING_DIR
      @object.load(path, true)

      ScratchPad.recorded.first.should be_an_instance_of(Class)
    end

    describe "with top-level methods" do
      before :each do
        path = File.expand_path "load_wrap_method_fixture.rb", CODE_LOADING_DIR
        @object.load(path, true)
      end

      it "allows calling top-level methods" do
        ScratchPad.recorded.last.should == :load_wrap_loaded
      end

      it "does not pollute the receiver" do
        lambda { @object.send(:top_level_method) }.should raise_error(NameError)
      end
    end
  end

  # ...

end

load_wrap_method_fixture.rb

# spec/ruby/fixtures/code/load_wrap_method_fixture.rb

def top_level_method
  ::ScratchPad << :load_wrap_loaded
end

begin
  top_level_method
rescue NameError
  ::ScratchPad << :load_wrap_error
end