Add test for utils/css.js isEmbedded function

Author: s0ph1e

lib/utils/css.js

@@ -29,4 +29,5 @@ function getSourcesPaths(text) {
     .value();
 }
 
+module.exports.isEmbedded = isEmbedded;
 module.exports.getSourcesPaths = getSourcesPaths;

test/utils-css-test.js

@@ -0,0 +1,23 @@
+var css = require('../lib/utils/css');
+
+var should = require('should')
+  describe('Css utils', function(){
+    describe('#isEmbedded(src)', function(){
+      it('should return true if src is base64-encoded', function(){
+        var base64_1 = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAA \
+        ABlBMVEUAAAD///+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeN               \
+        Ge4Ug9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC';
+        var base64_2 = 'data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D';
+        css.isEmbedded(base64_1).should.be.true;
+        css.isEmbedded(base64_2).should.be.true;
+      });
+      it('should return false if src is not base64-encoded', function(){
+        var path = 'images/px/arrow-090-small.png';
+        var url = 'https://www.google.com.ua/images/srpr/logo11w.png';
+        css.isEmbedded(path).should.be.false;
+        css.isEmbedded(url).should.be.false;
+      });
+    });
+
+
+  });