Added ability to compare date/time with infinity

Date, DateTime, Time and TimeWithZone can now be compared to infinity,
  so it's now possible to create ranges with one infinite bound and
  date/time object as another bound.

  Ex.: @range = Range.new(Date.today, Float::INFINITY)

Also it's possible to check inclusion of date/time in range with
  conversion.

  Ex.: @range.include?(Time.now + 1.year) # => true
       @range.include?(DateTime.now + 1.year) # => true

Ability to create date/time ranges with infinite bound is required
  for handling postgresql range types.

1 files changed, 7 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/date_ext_test.rb b/activesupport/test/core_ext/date_ext_test.rb
index 5e89a6e00b..f8b219fee6 100644
--- a/activesupport/test/core_ext/date_ext_test.rb
+++ b/activesupport/test/core_ext/date_ext_test.rb
@@ -353,6 +353,13 @@ class DateExtBehaviorTest < ActiveSupport::TestCase
       Date.today.freeze.freeze
     end
   end
+
+  def test_compare_with_infinity
+    assert_nothing_raised do
+      assert_equal(-1, Date.today <=> Float::INFINITY)
+      assert_equal(1, Date.today <=> -Float::INFINITY)
+    end
+  end
 end
 
 class DateExtConversionsTest < ActiveSupport::TestCase