Test suite for the js/Blocks/DrumBlocks.js (sugarlabs#4527)

* creating test suite for js/block/DrumBlocks.js

* Exporting modules for test

Author: omsuneri

js/blocks/DrumBlocks.js

@@ -593,3 +593,6 @@ function setupDrumBlocks(activity) {
     new PlayEffectBlock().setup(activity);
     new PlayDrumBlock().setup(activity);
 }
+if (typeof module !== "undefined" && module.exports) {
+    module.exports = { setupDrumBlocks };
+}