Add unit test for images in markdown

src/core/components/providers/markdown.jsx

@@ -30,6 +30,9 @@ export default Markdown
 
 const sanitizeOptions = {
     allowedTags: sanitize.defaults.allowedTags.concat([ "h1", "h2", "img" ]),
+    allowedAttributes: {
+        "img": sanitize.defaults.allowedAttributes.img.concat(["title"])
+    },
     textFilter: function(text) {
         return text.replace(/"/g, "\"")
     }