Add test case with gulp-autoprefixer and gulp-sourcemaps

package.json

@@ -29,6 +29,10 @@
   },
   "devDependencies": {
     "eslint": "^0.17.1",
+    "gulp": "^3.8.11",
+    "gulp-autoprefixer": "^2.2.0",
+    "gulp-sourcemaps": "^1.5.2",
+    "gulp-tap": "^0.1.3",
     "mocha": "^2.2.1",
     "should": "^5.2.0"
   }

test/main.js

@@ -5,6 +5,10 @@ var gutil = require('gulp-util');
 var path = require('path');
 var fs = require('fs');
 var sass = require('../index');
+var gulp = require('gulp');
+var sourcemaps = require('gulp-sourcemaps');
+var autoprefixer = require('gulp-autoprefixer');
+var tap = require('gulp-tap');
 
 var createVinyl = function createVinyl(filename, contents) {
   var base = path.join(__dirname, 'scss');
@@ -380,4 +384,28 @@ describe('gulp-sass -- sync compile', function() {
     });
     stream.write(sassFile);
   });
+
+  it('should work with gulp-sourcemaps and gulp-autoprefixer', function(done) {
+    var expectedSources = [
+      'includes/_cats.scss',
+      'includes/_dogs.sass',
+      'inheritance.scss'
+    ];
+
+    gulp.src(path.join(__dirname, '/scss/inheritance.scss'))
+      .pipe(sourcemaps.init())
+      .pipe(sass.sync())
+      // .pipe(tap(function(file) {
+      //   should.exist(file.sourceMap);
+      //   file.sourceMap.sources.should.eql(expectedSources);
+      // }))
+      .pipe(autoprefixer())
+      .pipe(sourcemaps.write())
+      .pipe(gulp.dest(path.join(__dirname, '/results/')))
+      .pipe(tap(function(file) {
+        should.exist(file.sourceMap);
+        file.sourceMap.sources.should.eql(expectedSources);
+      }))
+      .on('end', done);
+  });
 });