diff --git a/test/test-class_builder-final.js b/test/test-class_builder-final.js
new file mode 100644
index 0000000..30ef6ca
--- /dev/null
+++ b/test/test-class_builder-final.js
@@ -0,0 +1,92 @@
+/**
+ * Tests final members
+ *
+ *  Copyright (C) 2010 Mike Gerwitz
+ *
+ *  This file is part of ease.js.
+ *
+ *  ease.js is free software: you can redistribute it and/or modify it under the
+ *  terms of the GNU Lesser General Public License as published by the Free
+ *  Software Foundation, either version 3 of the License, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author  Mike Gerwitz
+ * @package test
+ */
+
+var common  = require( './common' ),
+    assert  = require( 'assert' ),
+    builder = common.require( 'class_builder' ),
+
+    Class      = common.require( 'class' )
+    FinalClass = common.require( 'class_final' )
+;
+
+
+/**
+ * Ensure that FinalClass properly forwards data to create a new Class.
+ */
+( function testFinalClassesAreValidClasses()
+{
+    assert.ok( Class.isClass( FinalClass( {} ) ),
+        "Final classes should generate valid classes"
+    );
+} )();
+
+
+/**
+ * When a class is declared as final, it should prevent it from ever being
+ * extended. Ever.
+ */
+( function testFinalClassesCannotBeExtended()
+{
+    try
+    {
+        // this should fail
+        FinalClass( 'Foo', {} ).extend( {} );
+    }
+    catch ( e )
+    {
+        assert.ok(
+            e.message.search( 'Foo' ) !== -1,
+            "Final class error message should contain name of class"
+        );
+
+        return;
+    }
+
+    assert.fail( "Should not be able to extend final classes" );
+} )();
+
+
+/**
+ * Ensure we're able to create final classes by extending existing classes.
+ */
+( function testCanCreateFinalSubtypes()
+{
+    var Foo        = builder.build( {} ),
+        FinalNamed = FinalClass( 'FinalNamed' ).extend( Foo, {} ),
+        FinalAnon  = FinalClass.extend( Foo, {} )
+    ;
+
+    // named
+    assert.throws( function()
+    {
+        FinalNamed.extend( {} );
+    }, Error, "Cannot extend final named subtype" );
+
+    // anonymous
+    assert.throws( function()
+    {
+        FinalAnon.extend( {} );
+    }, Error, "Cannot extend final anonymous subtype" );
+} )();
+