测试方法-Ruby / RSpec与Java / Mockito

require \'rubygems\'
require \'rspec\'

class MyUtils
  def self.newest_file(files)
    newest = nil
    files.each do |file|
      if newest.nil? || (File.new(file).mtime > File.new(newest).mtime)
        newest = file
      end
    end
    newest
  end
end

describe MyUtils do
  it \"should return the filename of the file with the newest timestamp\" do
    file_a = mock(\'file\', :mtime => 1000)
    file_b = mock(\'file\', :mtime => 2000)
    File.stub(:new).with(\"a.txt\").and_return(file_a)
    File.stub(:new).with(\"b.txt\").and_return(file_b)
    MyUtils.newest_file([\'a.txt\', \'b.txt\']).should == \'b.txt\'
  end
end