time.c: [DOC] Time#localtime

* time.c: state that Time#localtime does nothing when nothing
  changes.  [ruby-core:87675] [Bug #14880]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63823 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index b32caff9c5..f14800a1ad 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -105,6 +105,17 @@ class TestTimeTZ < Test::Unit::TestCase
     assert_equal(expected, real, m)
   end
 
+  def test_localtime_zone
+    t = with_tz("America/Los_Angeles") {
+      Time.local(2000, 1, 1)
+    }
+    z1 = t.zone
+    z2 = with_tz(tz="Asia/Singapore") {
+      t.localtime.zone
+    }
+    assert_equal(z2, z1)
+  end
+
   def test_america_los_angeles
     with_tz(tz="America/Los_Angeles") {
       assert_time_constructor(tz, "2007-03-11 03:00:00 -0700", :local, [2007,3,11,2,0,0])