Stubbed out the calls to fs.writeFile() using sinon module

package.json

@@ -42,13 +42,14 @@
     "optimist": "0.6.x",
     "node-watch": "0.3.x",
     "chalk": "~0.4.0",
-    "nan": "~0.8.0"
+    "nan": "~0.8.0",
+    "mocha": "1.18.x"
   },
   "devDependencies": {
-    "mocha": "1.18.x",
     "jshint": "~2.4.4",
     "coveralls": "~2.10.0",
     "mocha-lcov-reporter": "0.0.1",
-    "jscoverage": "~0.3.8"
+    "jscoverage": "~0.3.8",
+    "sinon": "^1.9.1"
   }
 }

test/test.js

-/* global afterEach */
+/* global beforeEach, afterEach */
 /*jshint multistr:true */
 var sass = process.env.NODESASS_COVERAGE ? require('../sass-coverage') : require('../sass');
 var assert = require('assert');
 var path = require('path');
 var fs = require('fs');
+var sinon = require('sinon');
 var badSampleFilename = 'sample.scss';
 var sampleFilename = path.resolve(__dirname, 'sample.scss');
 
@@ -192,22 +193,24 @@ describe("compile file", function() {
 
 describe("render to file", function() {
   var outFile = path.resolve(__dirname, 'out.css'),
-      files = [outFile, 'out.css.map', 'foo.css.map', 'sample.css.map'];
+      filesWritten;
 
-  afterEach(function() {
-    files.forEach(function(file) {
-      file = path.resolve(__dirname, file);
-      if (fs.existsSync(file)) {
-        fs.unlinkSync(file);
-      }
+  beforeEach(function() {
+    filesWritten = {};
+    sinon.stub(fs, 'writeFile', function(path, contents, cb) {
+      filesWritten[path] = contents;
+      cb();
     });
   });
+  afterEach(function() {
+    fs.writeFile.restore();
+  });
   it("should compile with renderFile", function(done) {
     sass.renderFile({
       file: sampleFilename,
       outFile: outFile,
       success: function () {
-        var contents = fs.readFileSync(outFile);
+        var contents = filesWritten[outFile];
         done(assert.equal(contents, expectedRender));
       },
       error: function (error) {
@@ -237,8 +240,8 @@ describe("render to file", function() {
       outFile: outFile,
       sourceMap: true,
       success: function (cssFile, sourceMapFile) {
-        var css = fs.readFileSync(cssFile).toString();
-        var map = fs.readFileSync(sourceMapFile).toString();
+        var css = filesWritten[cssFile];
+        var map = filesWritten[sourceMapFile];
         var mapFileName = 'out.css.map';
         assert.equal(path.basename(sourceMapFile), mapFileName);
         assert.ok(css.indexOf('sourceMappingURL=' + mapFileName) !== -1);
@@ -258,8 +261,8 @@ describe("render to file", function() {
       outFile: outFile,
       sourceMap: mapFileName,
       success: function (cssFile, sourceMapFile) {
-        var css = fs.readFileSync(cssFile).toString();
-        var map = fs.readFileSync(sourceMapFile).toString();
+        var css = filesWritten[cssFile];
+        var map = filesWritten[sourceMapFile];
         assert.equal(path.basename(sourceMapFile), mapFileName);
         assert.ok(css.indexOf('sourceMappingURL=' + mapFileName) !== -1);
         assert.ok(map.indexOf('sample.scss') !== -1);