1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index f91cd66376..9bba30e577 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -659,6 +659,16 @@ else
       @tz ||= TZInfo::Timezone.get(tzname)
     end
   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