diff --git a/test/composition-helper-test.js b/test/composition-helper-test.js
index ceb2b4ea..2f2ba5f1 100644
--- a/test/composition-helper-test.js
+++ b/test/composition-helper-test.js
@@ -14,6 +14,9 @@ describe('CompositionHelper', function () {
         add: function () {},
         remove: function () {},
       },
+      getBoundingClientRect: function () {
+        return { width: 0 }
+      },
       style: {
         left: 0,
         top: 0