Added Interface.isInterface()

lib/interface.js

@@ -75,6 +75,26 @@ module.exports.extend = function()
 };
 
 
+/**
+ * Determines whether the provided object is an interface created through
+ * ease.js
+ *
+ * @param  {Object}  obj  object to test
+ *
+ * @return  {boolean}  true if interface (created through ease.js), otherwise
+ *                     false
+ */
+module.exports.isInterface = function( obj )
+{
+    obj = obj || {};
+
+    return ( obj.prototype instanceof Interface )
+        ? true
+        : false
+    ;
+};
+
+
 /**
  * Default interface implementation
  *

test/test-interface-extend.js

@@ -105,6 +105,12 @@ for ( var i = 0; i < base_types.length; i++ )
         "Interface contains defined abstract methods"
     );
 
+    assert.equal(
+        Interface.isInterface( BaseType ),
+        true,
+        "Interface is considered to be an interface"
+    );
+
 
     var SubType = Interface.extend( BaseType,
     {