Assert warnings for invalid offsets

Author: sjh9714

test/date/test_date_new.rb

@@ -199,11 +199,17 @@ def test_civil__offset
     assert_equal(-1.to_r, d.offset)
 
     # An out-of-range offset is ignored, as it is for the equivalent Integer.
-    d = DateTime.civil(2001,2,3, 0,0,0, 2)
+    assert_warning(/invalid offset/) do
+      d = DateTime.civil(2001,2,3, 0,0,0, 2)
+    end
     assert_equal(0, d.offset)
-    d = DateTime.civil(2001,2,3, 0,0,0, Rational(2, 1))
+    assert_warning(/invalid offset/) do
+      d = DateTime.civil(2001,2,3, 0,0,0, Rational(2, 1))
+    end
     assert_equal(0, d.offset)
-    d = DateTime.civil(2001,2,3, 0,0,0, Rational(49710, 1))
+    assert_warning(/invalid offset/) do
+      d = DateTime.civil(2001,2,3, 0,0,0, Rational(49710, 1))
+    end
     assert_equal(0, d.offset)
   end