old_contents: "use strict"
  
  var Jar = require("../src/Jar.js")
  
  describe("Jar", function () {
      
  })
new_contents: "use strict"
  
  var Jar = require("../src/Jar.js")
    , spawn = require("child_process").spawn
    , path = require("path")
    , fs = require("fs")
    , assert = require("assert")
  
  var helloBuildDir = path.resolve(__dirname + "/../support/hello")
    , helloJarPath = path.resolve(__dirname + "/../support/hello/hello.jar")
  
  var makeHelloJarFile = function (cb) {
      spawn("make", ["-C", helloBuildDir])
          .on("error", function (err) { throw err })
          .on("exit", function (code) {
              assert.equal(code, 0)
              assert(fs.existsSync(helloJarPath))
              cb()
          })
  }
  
  describe("Jar", function () {
      before(function (done) {
          makeHelloJarFile(done)
      })
  
      it("should …", function () {
          
      })
  })
subject: Build the test jar file from the tests.