RSpec mock test error

gistfile1.txt

# config 
RSpec.configure do |config|
  config.before(:each) do
    etcd = double
    require 'etcd'
    Etcd.client.stub(:new).and_return(etcd)
    allow(etcd).to receive(:get).and_raise(Net::HTTPFatalError)
  end
end

# Code
require 'etcd'
ruby_block 'etcd-stuff' do
  block do
    client = Etcd.client(host: 'some.host', port: 1234)
    client.set('/foo/bar', 'someval')
  end
  not_if do
    begin
      client = Etcd.client(host: 'some.host', port: 1234)
      client.get('/foo/bar')
      true
    rescue Net::HTTPServerException, Net::HTTPFatalError
      false
    end
  end
end

# Test
  it 'does etcd stuff' do
    expect(chef_run).to run_ruby_block('etcd-stuff')
  end

# Error
# Each test produces this:
     ArgumentError:
       wrong number of arguments (0 for 2)