Additional test coverage to DateTime comparison (sub millisecond).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44199 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/date/test_date.rb

@@ -141,4 +141,13 @@ class TestDate < Test::Unit::TestCase
     assert_instance_of(String, d.to_s)
   end
 
+  def test_submillisecond_comparison
+    d1 = DateTime.new(2013, 12, 6, 0, 0, Rational(1, 10000))
+    d2 = DateTime.new(2013, 12, 6, 0, 0, Rational(2, 10000))
+    # d1 is 0.0001s earlier than d2
+    assert_equal(-1, d1 <=> d2)
+    assert_equal(0, d1 <=> d1)
+    assert_equal(1, d2 <=> d1)
+  end
+
 end