chore: Added unit tests around drawBackgroundRect and drawRect

src/diagrams/sequence/svgDraw.js

@@ -168,7 +168,6 @@ export const drawLoop = function (elem, bounds, labelText, conf) {
   }
 }
 
-
 /**
  * Draws a background rectangle
  * @param color - The fill color for the background
@@ -181,8 +180,8 @@ export const drawBackgroundRect = function (elem, bounds) {
     height: bounds.stopy - bounds.starty,
     fill: bounds.fill,
     class: 'rect'
-  });
-  rectElem.lower();
+  })
+  rectElem.lower()
 }
 /**
  * Setup arrow head and define the marker. The result is appended to the svg.