1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index c9c2b77115..dade0bff16 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -752,6 +752,16 @@ class TestTimeTZ::DummyTZ < Test::Unit::TestCase
   def self.make_timezone(tzname, abbr, utc_offset, abbr2 = nil, utc_offset2 = nil)
     TestTimeTZ::TZ.new(tzname, abbr, utc_offset, abbr2, utc_offset2)
   end
+
+  def test_fractional_second
+    x = Object.new
+    def x.local_to_utc(t); t + 8*3600; end
+    def x.utc_to_local(t); t - 8*3600; end
+
+    t1 = Time.new(2020,11,11,12,13,14.124r, '-08:00')
+    t2 = Time.new(2020,11,11,12,13,14.124r, x)
+    assert_equal(t1, t2)
+  end
 end
 
 begin