Add a sass file to the inheritance test

test/expected/inheritance.css

@@ -1,6 +1,9 @@
 body {
   background: pink; }
 
+footer {
+  background: red; }
+
 .error, .badError {
   border: #f00;
   background: #fdd; }

test/main.js

@@ -5,7 +5,6 @@ var gutil = require('gulp-util');
 var path = require('path');
 var fs = require('fs');
 var sass = require('../index');
-var assert = require('assert');
 
 var createVinyl = function createVinyl(filename, contents) {
   var base = path.join(__dirname, 'scss');
@@ -131,6 +130,7 @@ describe('gulp-sass -- async compile', function() {
     // Expected sources are relative to file.base
     var expectedSources = [
       'includes/_cats.scss',
+      'includes/_dogs.sass',
       'inheritance.scss'
     ];
 
@@ -148,7 +148,7 @@ describe('gulp-sass -- async compile', function() {
     stream = sass();
     stream.on('data', function(cssFile) {
       should.exist(cssFile.sourceMap);
-      assert.deepEqual(cssFile.sourceMap.sources, expectedSources);
+      cssFile.sourceMap.sources.should.eql(expectedSources);
       done();
     });
     stream.write(sassFile);

test/scss/includes/_dogs.sass

@@ -0,0 +1,5 @@
+$blue: #3bbfce;
+$margin: 16px;
+
+footer
+  background: red;

test/scss/inheritance.scss

@@ -1,4 +1,5 @@
 @import "includes/cats";
+@import "includes/dogs";
 
 .error {
   border: #f00;