strip .css from file names w/ test

lib/compass/compiler.rb

@@ -36,7 +36,7 @@ module Compass
 
     def stylesheet_name(sass_file)
       if sass_file.index(from) == 0
-        sass_file[(from.length + 1)..-6]
+        sass_file[(from.length + 1)..-6].sub(/\.css$/,'')
       else
         raise Compass::Error, "You must compile individual stylesheets from the project directory."
       end

test/units/compiler_test.rb

@@ -0,0 +1,11 @@
+require 'test_helper'
+require 'fileutils'
+
+class CompilerTest < Test::Unit::TestCase
+  
+  it "should strip css from file name and reappend" do
+    compiler = Compass::Compiler.new(Dir.pwd, 'foo', 'bar', {})
+    assert_equal 'screen', compiler.stylesheet_name(File.join(Dir.pwd, 'foo', 'screen.css.scss'))
+  end
+
+end