update elements and fix some bugs

lib/src/iron-test-helpers/mock-interactions.js

Index: lib/src/iron-test-helpers/mock-interactions.js
diff --git a/lib/src/iron-test-helpers/mock-interactions.js b/lib/src/iron-test-helpers/mock-interactions.js
index 324390e858b3c3e718872dc200f69a63cd9a09c8..7fad02661bbf201db25c42fe89e98c4087456d7d 100644
--- a/lib/src/iron-test-helpers/mock-interactions.js
+++ b/lib/src/iron-test-helpers/mock-interactions.js
@@ -40,7 +40,9 @@
       bubbles: true,
       cancelable: true,
       clientX: xy.x,
-      clientY: xy.y
+      clientY: xy.y,
+      // Make this a primary input.
+      buttons: 1 // http://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons
     };
     var e;
     var mousetype = type === 'tap' ? 'click' : 'mouse' + type;
@@ -48,8 +50,19 @@
       e = new MouseEvent(mousetype, props);
     } else {
       e = document.createEvent('MouseEvent');
-      e.initMouseEvent(mousetype, props.bubbles, props.cancelable, null, null, 0, 0,
-        props.clientX, props.clientY, false, false, false, false, 0, null);
+      e.initMouseEvent(
+        mousetype, props.bubbles, props.cancelable,
+        null, /* view */
+        null, /* detail */
+        0,    /* screenX */
+        0,    /* screenY */
+        props.clientX, props.clientY,
+        false, /*ctrlKey */
+        false, /*altKey */
+        false, /*shiftKey */
+        false, /*metaKey */
+        0,     /*button */
+        null   /*relatedTarget*/);
     }
     node.dispatchEvent(e);
   }
@@ -130,7 +143,9 @@
   }
 
   function keyboardEventFor(type, keyCode) {
-    var event = new CustomEvent(type);
+    var event = new CustomEvent(type, {
+      bubbles: true
+    });
 
     event.keyCode = keyCode;
     event.code = keyCode;