RSpec和Open-URI如何模拟引发SocketError/TimeoutError

require 'spec_helper'
require 'open-uri'
require 'webmock/rspec'
require 'timecop'

describe 'Simulating SocketError/TimeoutError' do
  before do
    WebMock.disable_net_connect!
  end

  after do
    WebMock.reset!
  end

  it 'raises SocketError' do
    stub_request(:get, 'http://example.com').to_raise(SocketError)

    expect { open('http://example.com') }.to raise_error(SocketError)
  end

  it 'raises TimeoutError' do
    stub_request(:get, 'http://example.com').to_timeout

    Timecop.freeze(Time.now + 30) do
      expect { open('http://example.com') }.to raise_error(Timeout::Error)
    end
  end
end