Bug: Classes don't follow the double docs WRT #dup

spec/rspec/mocks/partial_double_spec.rb

@@ -171,6 +171,27 @@ def self.inspect
  expect { duplicate.foobar }.to raise_error(NoMethodError, /foobar/)
  expect { verify object }.to fail_with(/foobar/)
  end
+
+ describe "class" do
+ let(:object) do
+ Class.new
+ end
+
+ it "shares message expectations with clone" do
+ expect(object).to receive(:foobar)
+ twin = object.clone
+ twin.foobar
+ expect { verify twin }.not_to raise_error
+ expect { verify object }.not_to raise_error
+ end
+
+ it "clears message expectations when `dup`ed" do
+ expect(object).to receive(:foobar)
+ duplicate = object.dup
+ expect { duplicate.foobar }.to raise_error(NoMethodError, /foobar/)
+ expect { verify object }.to fail_with(/foobar/)
+ end
+ end
  end
 
  RSpec.describe "Using a reopened file object as a partial mock" do

spec/rspec/mocks/stub_spec.rb

@@ -95,6 +95,18 @@ def existing_private_instance_method
  expect { @class.existing_private_class_method }.to raise_error NoMethodError, /private method [`']existing_private_class_method/
  end
 
+ context "on a class" do
+ it "is retained when stubbed object is `clone`d" do
+ allow(@class).to receive(:foobar).and_return(1)
+ expect(@class.clone.foobar).to eq(1)
+ end
+
+ it "is cleared when stubbed object when `dup`ed" do
+ allow(@class).to receive(:foobar).and_return(1)
+ expect { @class.dup.foobar }.to raise_error NoMethodError, /foobar/
+ end
+ end
+
  context "using `with`" do
  it 'determines which value is returned' do
  allow(@stub).to receive(:foo).with(1) { :one }