test: use empty function

Author: aminya

lib/mixins/canvas-drawer.js

@@ -32,7 +32,7 @@ export default class CanvasDrawer {
   initializeCanvas () {
     if (SPEC_MODE) {
       // class methods only used for spying the calls
-      this.drawLines = (firstLine, lastLine) => { console.log({ firstLine, lastLine }) }
+      this.drawLines = (firstLine, lastLine) => {}
       this.drawLineDecoration = drawLineDecoration
       this.drawGutterDecoration = drawGutterDecoration
       this.drawHighlightDecoration = drawHighlightDecoration