change drop-zone id by Submit_checkbox click

Author: HelenYrofeeva

index.html

@@ -176,7 +176,7 @@
                     </div>
 
                     <div class="drop-zones">
-                        <div class="drop-zone" id="drop1">
+                        <div class="drop-zone" id="drop1" data-testid="testid_drop1">
                             Drop Zone
                         </div>
                     </div>

js/main.js

@@ -162,6 +162,10 @@ function forParentSubmit() {
 
     var ch3 = document.getElementById("form_checked3");
     ch3.className = "unchecked3";
+
+    // testid_drop1 -> newDropTestId
+    var dropZone = document.getElementById("drop1");
+    dropZone.setAttribute("data-testid", "newDropTestId");
 }
 
 function waitSubmit() {