Improving test coverage for Range#sum [#2489]

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

activesupport/test/core_ext/enumerable_test.rb

@@ -64,9 +64,9 @@ def test_empty_sums
   def test_enumerable_sums
     assert_equal 20, (1..4).sum { |i| i * 2 }
     assert_equal 10, (1..4).sum
+    assert_equal 10, (1..4.5).sum
     assert_equal 6, (1...4).sum
     assert_equal 'abc', ('a'..'c').sum
-    assert_raises(NoMethodError) { 1..2.5.sum }
   end
 
   def test_each_with_object