Rename all test files from JS -> ES6

test/javascripts/components/share-button.js

@@ -0,0 +1,13 @@
+import Button from "discourse/components/d-button";
+
+export default Button.extend({
+  classNames: ["btn-default", "share"],
+  icon: "link",
+  title: "topic.share.help",
+  label: "topic.share.title",
+  attributeBindings: ["url:data-share-url"],
+
+  click() {
+    return true;
+  }
+});