Adding a test for loading specific package names.

test/unit/test_packager.rb

@@ -91,6 +91,7 @@ def test_package_caching
   end
 
   def test_precache_all
+    Jammit.load_configuration('test/config/assets.yml').reload!
     Jammit.packager.precache_all('test/precache', 'http://www.example.com')
     assert PRECACHED_FILES == glob('test/precache/*')
     assert Zlib::GzipReader.open('test/precache/css_test-datauri.css.gz') {|f| f.read } == File.read('test/fixtures/jammed/css_test-datauri.css')
@@ -130,4 +131,12 @@ def test_package_helper
     FileUtils.rm_rf("test/public/assets")
   end
 
+  def test_packaging_javascripts_with_package_names
+    FileUtils.rm_rf("test/public/assets/*")
+    Jammit.package! :config_file => "test/config/assets.yml", :package_names => [:js_test]
+    assert File.exists?("test/public/assets/js_test.js")
+    assert File.read('test/public/assets/js_test.js') == File.read('test/fixtures/jammed/js_test_package_names.js')
+    FileUtils.rm_rf("test/public/assets")
+  end
+
 end