diff --git a/tests/fixtures/globals.js b/tests/fixtures/globals.js
index 8a0f59b..8220fc6 100644
--- a/tests/fixtures/globals.js
+++ b/tests/fixtures/globals.js
@@ -16,6 +16,7 @@
     window.userAgent = userAgentParser.parse(navigator.userAgent);
     window.userAgent.isNode = false;
     window.userAgent.isBrowser = true;
+    window.userAgent.isIE = window.userAgent.isIE || /Edge/.test(navigator.userAgent);
   }
   else {
     // Expose Node globals