解决方法
你可以存储内核#获取,除了它被混合到对象中,所以存在它：
class Mirror
def echo
print "enter something: "
response = gets.chomp
puts "#{response}"
end
end
require 'rspec'
describe Mirror do
it "should echo" do
@mirror = Mirror.new
@mirror.stub!(:gets) { "phrase\n" }
@mirror.should_receive(:puts).with("phrase")
@mirror.echo
end
end