Abstract method list is now updated for classes that implement interfaces

lib/class.js

@@ -49,8 +49,11 @@ exports.extend = function( base )
 exports.implement = function()
 {
     var len  = arguments.length,
-        dest = exports.extend(),
-        arg  = null;
+        dest = {},
+        arg  = null,
+
+        abstract_list = []
+        implemented   = [];
 
     // add each of the interfaces
     for ( var i = 0; i < len; i++ )
@@ -58,11 +61,20 @@ exports.implement = function()
         arg = arguments[ i ];
 
         // copy all interface methods to the class (does not yet deep copy)
-        util.propCopy( arg.prototype, dest.prototype );
-        dest.implemented.push( arg );
+        util.propCopy( arg.prototype, dest );
+        implemented.push( arg );
     }
 
-    return dest;
+    var class_new = exports.extend( dest );
+
+    // we cannot reassign the value since it is frozen, so copy the values into
+    // the array
+    while ( implemented[ 0 ] )
+    {
+        class_new.implemented.push( implemented.shift() );
+    }
+
+    return class_new;
 };
 
 

test/test-class-implement.js

@@ -70,3 +70,23 @@ assert.ok(
     "Abstract methods are copied into the new class prototype"
 );
 
+assert.equal(
+    Foo.isAbstract(),
+    true,
+    "Classes that implements interface(s) are considered abstract if the " +
+        "implemented methods have no concrete implementations"
+);
+
+assert.equal(
+    Foo.abstractMethods.length,
+    2,
+    "Abstract methods list is updated when interface is implemented"
+);
+
+assert.ok(
+    ( ( Foo.abstractMethods[ 0 ] == 'foo' )
+        && ( Foo.abstractMethods[ 1 ] == 'foo2' )
+    ),
+    "Abstract methods list contains names of implemented methods"
+);
+