Fix focusBlur test suite when document not focused

test/unit/focusBlur.test.js

diff --git a/test/unit/focusBlur.test.js b/test/unit/focusBlur.test.js
index 1bd3af9..27180ae 100644
--- a/test/unit/focusBlur.test.js
+++ b/test/unit/focusBlur.test.js
@@ -1,6 +1,6 @@
 suite('focusBlur', function() {
   function assertHasFocus(mq, name, invert) {
-    assert.ok(!!invert ^ $(mq.el()).find('textarea').is(':focus'), name + (invert ? ' does not have focus' : ' has focus'));
+    assert.ok(!!invert ^ ($(mq.el()).find('textarea')[0] === document.activeElement), name + (invert ? ' does not have focus' : ' has focus'));
   }
 
   suite('handlers can shift focus away', function() {