Add test for instance_extract. [test]

test/core/kernel/test_instance_extract.rb

@@ -0,0 +1,28 @@
+covers 'facets/kernel/extract'
+
+test_case Kernel do 
+
+   method :extract do
+
+     test "extracts hash into object" do
+       c = Class.new do
+         def initialize
+           @cmd='cls'
+         end
+         def cmd
+           @cmd
+         end
+         def page
+           @page
+         end
+       end
+
+       o = c.new
+       o.extract('cmd'=>'hello','page'=>'frontpage')
+       o.cmd.assert == 'cls'
+       o.page.assert == 'frontpage'
+     end
+
+   end
+
+ end