respect nsec in TimeWithZone

when we pass fractional usec to Time methods we should use Rational
instead of Float because of accuracy problem

    Time.local(2011,6,12,23,59,59,999999.999).nsec
    # => 999999998

    Time.local(2011,6,12,23,59,59,Rational(999999999, 1000)).nsec
    # => 999999999

1 files changed, 8 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index b62337e31b..1293f104e5 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -80,6 +80,14 @@ class TimeWithZoneTest < ActiveSupport::TestCase
     ActiveSupport.use_standard_json_time_format = old
   end
 
+  def test_nsec
+    local     = Time.local(2011,6,7,23,59,59,Rational(999999999, 1000))
+    with_zone = ActiveSupport::TimeWithZone.new(nil, ActiveSupport::TimeZone["Hawaii"], local)
+
+    assert_equal local.nsec, with_zone.nsec
+    assert_equal with_zone.nsec, 999999999
+  end
+
   def test_strftime
     assert_equal '1999-12-31 19:00:00 EST -0500', @twz.strftime('%Y-%m-%d %H:%M:%S %Z %z')
   end