Added unit tests for source comments

test/expected/source-comments/inheritance.css

@@ -0,0 +1,21 @@
+/* line 4, /test/path/_cats.scss */
+body {
+  background: pink; }
+
+/* line 4, /test/path/_dogs.sass */
+footer {
+  background: red; }
+
+/* line 4, /test/path/inheritance.scss */
+.error, .badError {
+  border: #f00;
+  background: #fdd; }
+
+/* line 9, /test/path/inheritance.scss */
+.error.intrusion, .intrusion.badError {
+  font-size: 1.3em;
+  font-weight: bold; }
+
+/* line 14, /test/path/inheritance.scss */
+.badError {
+  border-width: 3px; }

test/expected/source-comments/variables.css

@@ -0,0 +1,10 @@
+/* line 4, /test/path/variables.scss */
+.content-navigation {
+  border-color: #3bbfce;
+  color: #2ca2af; }
+
+/* line 10, /test/path/variables.scss */
+.border {
+  padding: 8px;
+  margin: 8px;
+  border-color: #3bbfce; }

test/main.js

@@ -422,3 +422,42 @@ describe('gulp-sass -- sync compile', function() {
       .on('end', done);
   });
 });
+
+describe('gulp-sass -- source comments', function() {
+  var testPath = '/test/path/';
+
+  // Replace comment path from current users filesystem to something we can test consistently
+  var swapPathForTesting = function (contents) {
+    return contents.replace(/(.*)(, )(.*?)(\w+\.(?:scss|sass))( \*\/)/g, '$1$2' + testPath + '$4$5');
+  };
+
+  it('should properly add file path comment', function(done) {
+    var sassFile = createVinyl('variables.scss');
+    var stream = sass({ 'sourceComments': true });
+    stream.on('data', function(cssFile) {
+      var contents;
+      should.exist(cssFile.contents);
+      contents = swapPathForTesting(cssFile.contents.toString());
+      contents.should.equal(
+        fs.readFileSync(path.join(__dirname, 'expected/source-comments/variables.css'), 'utf8')
+      );
+      done();
+    });
+    stream.write(sassFile);
+  });
+
+  it('should properly add file path comment with includes', function(done) {
+    var sassFile = createVinyl('inheritance.scss');
+    var stream = sass({ 'sourceComments': true });
+    stream.on('data', function(cssFile) {
+      var contents;
+      should.exist(cssFile.contents);
+      contents = swapPathForTesting(cssFile.contents.toString());
+      contents.should.equal(
+        fs.readFileSync(path.join(__dirname, 'expected/source-comments/inheritance.css'), 'utf8')
+      );
+      done();
+    });
+    stream.write(sassFile);
+  });
+});