diff --git a/test/unit/working_time_test.rb b/test/unit/working_time_test.rb
new file mode 100644
index 000000000..dba620a5f
--- /dev/null
+++ b/test/unit/working_time_test.rb
@@ -0,0 +1,40 @@
+# encoding: utf-8
+require 'test_helper'
+
+class WorkingTimeTest < ActiveSupport::TestCase
+  test 'working time' do
+    tests = [
+
+      # test 1
+      {
+        :start  => '2012-12-17 08:00:00',
+        :end    => '2012-12-18 08:00:00',
+        :diff   => 480,
+        :config => {
+          :work_week            => [:mon, :tue, :wed, :thu, :fri ],
+          :beginning_of_workday => '8:00 am',
+          :end_of_workday       => '6:00 pm',
+        },
+      },
+
+      # test 2
+      {
+        :start  => '2012-12-23 08:00:00',
+        :end    => '2012-12-24 10:30:42',
+        :diff   => 0,
+        :config => {
+          :work_week            => [:mon, :tue, :wed, :thu, :fri ],
+          :beginning_of_workday => '8:00 am',
+          :end_of_workday       => '6:00 pm',
+          :holidays             => [
+            '2012-12-24', '2012-12-25', '2012-12-26'
+          ],
+        },
+      },
+    ]
+    tests.each { |test|
+#      diff = some_method( test[:start], test[:end], test[:config] )
+#      assert_equal( diff, test[:diff], 'diff' )
+    }
+  end
+end