write out stats test results

test/Stats.test.js

@@ -2,10 +2,12 @@
 var should = require("should");
 var path = require("path");
 var fs = require("fs");
+var mkdirp = require("mkdirp");
 
 var webpack = require("../lib/webpack");
 
 var base = path.join(__dirname, "statsCases");
+var outputBase = path.join(__dirname, "js", "stats");
 var tests = fs.readdirSync(base);
 var Stats = require("../lib/Stats");
 
@@ -23,22 +25,12 @@ describe("Stats", function() {
  }
  (Array.isArray(options) ? options : [options]).forEach(function(options) {
  options.context = path.join(base, testName);
+ options.output = options.output || {};
+ options.output.path = path.join(outputBase, testName);
  });
  var c = webpack(options);
- var files = {};
  var compilers = c.compilers ? c.compilers : [c];
  compilers.forEach(function(c) {
- c.outputFileSystem = {
- join: path.join.bind(path),
- mkdirp: function(path, callback) {
- callback();
- },
- writeFile: function(name, content, callback) {
- files[name] = content.toString("utf-8");
- callback();
- }
- };
-
  var ifs = c.inputFileSystem;
  c.inputFileSystem = Object.create(ifs);
  c.inputFileSystem.readFile = function() {