diff --git a/test/unit/base.html b/test/unit/base.html
index f4de341778..679d6bb2c3 100644
--- a/test/unit/base.html
+++ b/test/unit/base.html
@@ -34,6 +34,7 @@
   Child._registerFeatures = function() {};
   Child._initFeatures = function() {};
   Child._setAttributeToProperty = function() {};
+  Child._desugarBehaviors = function() {};
   Child._doBehavior = function(name, args) {
     if (this[name]) {
       this[name].apply(this, args || []);
diff --git a/test/unit/micro-elements.html b/test/unit/micro-elements.html
index 86c902479d..e57b006e85 100644
--- a/test/unit/micro-elements.html
+++ b/test/unit/micro-elements.html
@@ -95,3 +95,14 @@
   });
 
 </script>
+
+
+<dom-module id="falsey-polymer-arg">
+
+  <script>
+
+    Polymer();
+
+  </script>
+
+</dom-module>
\ No newline at end of file
diff --git a/test/unit/micro.html b/test/unit/micro.html
index dbba916d6a..2ed24729ad 100644
--- a/test/unit/micro.html
+++ b/test/unit/micro.html
@@ -125,6 +125,20 @@
       assert.equal(b.getAttribute('is'), 'x-mixed-case-button');
     });
 
+    test('input to Polymer is a `class`', function() {
+      var _class = function() {};
+      _class.prototype = {
+        is: 'x-class-as-argument-test'
+      };
+      Polymer(_class);
+      var a = document.createElement('x-class-as-argument-test');
+      assert.equal(a.is, 'x-class-as-argument-test');
+    });
+
+    test('input to Polymer is falsey', function() {
+      var a = document.createElement('falsey-polymer-arg');
+      assert.equal(a.is, 'falsey-polymer-arg');
+    });
   });
 
 </script>