add a test for years close to 0 for Date

* it is problematic with Joda-Time since JulianChronology does not accept a year 0

test/jruby.1.9.index

@@ -16,6 +16,7 @@ test_comparable
 test_core_arities
 test_custom_enumerable
 test_cvars_in_odd_scopes
+test_date_joda_time
 test_defined
 test_default_constants
 test_delegated_array_equals

test/test_date_joda_time.rb

@@ -0,0 +1,15 @@
+require 'test/unit'
+require 'date'
+
+class TestDateJodaTime < Test::Unit::TestCase
+  def test_years_around_0
+    (-2..2).each do |year|
+      assert_equal year, Date.new(year).year
+      assert_equal year, DateTime.new(year).year
+      [Date::GREGORIAN, Date::ITALY, Date::ENGLAND, Date::JULIAN].each do |sg|
+        assert_equal year, Date.new(year, 1, 1, sg).year
+        assert_equal year, DateTime.new(year, 1, 1, 0, 0, 0, 0, sg).year
+      end
+    end
+  end
+end