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, 25 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/range_ext_test.rb b/activesupport/test/core_ext/range_ext_test.rb
index f0cdc0bfd4..0051c48984 100644
--- a/activesupport/test/core_ext/range_ext_test.rb
+++ b/activesupport/test/core_ext/range_ext_test.rb
@@ -1,6 +1,7 @@
 require 'abstract_unit'
 require 'active_support/time'
 require 'active_support/core_ext/range'
+require 'active_support/core_ext/numeric'
 
 class RangeTest < ActiveSupport::TestCase
   def test_to_s_from_dates
@@ -85,4 +86,28 @@ class RangeTest < ActiveSupport::TestCase
     time_range_2 = Time.utc(2005, 12, 10, 17, 31)..Time.utc(2005, 12, 10, 18, 00)
     assert !time_range_1.overlaps?(time_range_2)
   end
+
+  def test_infinite_bounds
+    time_zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
+
+    time = Time.now
+    date = Date.today
+    datetime = DateTime.now
+    twz = ActiveSupport::TimeWithZone.new(time, time_zone)
+
+    infinity1 = Float::INFINITY
+    infinity2 = BigDecimal.new('Infinity')
+
+    [infinity1, infinity2].each do |infinity|
+      [time, date, datetime, twz].each do |bound|
+        [time, date, datetime, twz].each do |value|
+          assert Range.new(bound, infinity).include?(value + 10.years)
+          assert Range.new(-infinity, bound).include?(value - 10.years)
+
+          assert !Range.new(bound, infinity).include?(value - 10.years)
+          assert !Range.new(-infinity, bound).include?(value + 10.years)
+        end
+      end
+    end
+  end
 end