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class MailPurge   def initialize(imap)     @imap = imap   end   def purge(date)     # IMAP wants dates in the format: 8-Aug-2002     formatted_date = date.strftime('%d-%b-%Y')     @imap.authenticate('LOGIN', 'user', 'password')     @imap.select('INBOX')     message_ids = @imap.search(["BEFORE #{formatted_date}"])     @imap.store(message_ids, "+FLAGS", [:Deleted])   end end

#相当于mock出一个imap对象有authenticate select等方法，重要是就一个ids是返回值有依赖 def test_purging_mail   date = Date.new(2010,1,1)   formatted_date = '01-Jan-2010'   ids = [4,5,6]   mock = MiniTest::Mock.new   # mock expects:   #            method      return  arguments   #-------------------------------------------------------------   mock.expect(:authenticate,  nil, ['LOGIN', 'user', 'password'])   mock.expect(:select,        nil, ['INBOX'])   mock.expect(:search,        ids, [["BEFORE #{formatted_date}"]])   mock.expect(:store,         nil, [ids, "+FLAGS", [:Deleted]])   mp = MailPurge.new(mock)   mp.purge(date)   assert mock.verify end

def initialize   @expected_calls = {}   @actual_calls = Hash.new {|h,k| h[k] = [] } end #用来记录实际调用的，后面用到

def expect(name, retval, args=[])   n, r, a = name, retval, args # for the closure below   @expected_calls[name] = { :retval => retval, :args => args }   self.class.__send__(:define_method, name) { |*x|     raise ArgumentError unless @expected_calls[n][:args].size == x.size     @actual_calls[n] << { :retval => r, :args => x }     retval   }   self end #如何完成mock的呢，expect的三个参数存起来，然后，参数和预期的返回值，存起来，这里比较技巧

def verify   @expected_calls.each_key do |name|     expected = @expected_calls[name]     msg = "expected #{name}, #{expected.inspect}"     raise MockExpectationError, msg unless       @actual_calls.has_key? name and @actual_calls[name].include?(expected)   end   true end #验证

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