test/test_hijri.rb in hijri-0.0.1 vs test/test_hijri.rb in hijri-0.0.5

@@ -13,11 +13,15 @@
     date = Hijri::Hijri.new 1433, 9, 18
     assert_equal "1433-09-18", date.to_s
   end
   
   def test_greo_date_to_hijri
-    date = Date.new 2012, 8, 6
-    assert_equal "1433-09-18", date.to_hijri.to_s
+    date = Date.new 2014, 12, 7
+    # switiching between solar calendar and lunar calendar is a bit
+    # hard and complecated and there is error ratio to it. Because
+    # of that we accept multiple date as a result.
+    correct_dates = (14..16).map {|n| "1436-02-#{n}" }
+    assert_includes correct_dates, date.to_hijri.to_s
   end
   
   def test_hijri_to_greo
     h = Hijri::Hijri.new 1430, 1, 1
     g = Date.new  2008, 12, 29