Merge pull request #5075 from vyagh/test/pitchslider-widget-tests

test: add comprehensive PitchSlider widget unit tests

Author: omsuneri

js/widgets/pitchslider.js

@@ -224,3 +224,6 @@ class PitchSlider {
         this.activity.blocks.loadNewBlocks(newStack);
     }
 }
+if (typeof module !== "undefined") {
+    module.exports = PitchSlider;
+}