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diff --git a/test/date/test_date_arith.rb b/test/date/test_date_arith.rb
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+++ b/test/date/test_date_arith.rb
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+require 'test/unit'
+require 'date'
+
+class TestDateArith < Test::Unit::TestCase
+
+ def new_offset
+ d = DateTime.new(2002, 3, 14)
+ assert_equal(Rational(9, 24), d.new_offset(Rational(9, 24)).offset)
+ assert_equal(Rational(9, 24), d.new_offset('+0900').offset)
+ end
+
+ def test__plus
+ d = Date.new(2000,2,29) + -1
+ assert_equal([2000, 2, 28], [d.year, d.mon, d.mday])
+ d = Date.new(2000,2,29) + 0
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+ d = Date.new(2000,2,29) + 1
+ assert_equal([2000, 3, 1], [d.year, d.mon, d.mday])
+
+ d = DateTime.new(2000,2,29) + 1.to_r/2
+ assert_equal([2000, 2, 29, 12, 0, 0],
+ [d.year, d.mon, d.mday, d.hour, d.min, d.sec])
+ end
+
+ def test__plus__ex
+ e = TypeError
+ assert_raise(e) do
+ Date.new(2000,2,29) + 'foo'
+ end
+ assert_raise(e) do
+ DateTime.new(2000,2,29) + 'foo'
+ end
+ assert_raise(e) do
+ Date.new(2000,2,29) + Time.mktime(2000,2,29)
+ end
+ assert_raise(e) do
+ DateTime.new(2000,2,29) + Time.mktime(2000,2,29)
+ end
+ end
+
+ def test__minus
+ d = Date.new(2000,3,1) - -1
+ assert_equal([2000, 3, 2], [d.year, d.mon, d.mday])
+ d = Date.new(2000,3,1) - 0
+ assert_equal([2000, 3, 1], [d.year, d.mon, d.mday])
+ d = Date.new(2000,3,1) - 1
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+
+ d = Date.new(2000,3,1) - Date.new(2000,2,29)
+ assert_equal(1, d)
+ d = Date.new(2000,2,29) - Date.new(2000,3,1)
+ assert_equal(-1, d)
+
+ d = DateTime.new(2000,3,1) - 1.to_r/2
+ assert_equal([2000, 2, 29, 12, 0, 0],
+ [d.year, d.mon, d.mday, d.hour, d.min, d.sec])
+ end
+
+ def test__minus__ex
+ e = TypeError
+ assert_raise(e) do
+ Date.new(2000,2,29) - 'foo'
+ end
+ assert_raise(e) do
+ DateTime.new(2000,2,29) - 'foo'
+ end
+ assert_raise(e) do
+ Date.new(2000,2,29) - Time.mktime(2000,2,29)
+ end
+ assert_raise(e) do
+ DateTime.new(2000,2,29) - Time.mktime(2000,2,29)
+ end
+ end
+
+ def test__compare
+ assert_equal(0, (Date.new(2000,1,1) <=> Date.new(2000,1,1)))
+ assert_equal(-1, (Date.new(2000,1,1) <=> Date.new(2000,1,2)))
+ assert_equal(1, (Date.new(2000,1,2) <=> Date.new(2000,1,1)))
+ assert_equal(0, (Date.new(2001,1,4,Date::JULIAN) <=>
+ Date.new(2001,1,17, Date::GREGORIAN)))
+ assert_equal(0, (DateTime.new(2001,1,4,0,0,0,0,Date::JULIAN) <=>
+ DateTime.new(2001,1,17,0,0,0,0,Date::GREGORIAN)))
+ end
+
+ def test_prev
+ d = Date.new(2000,1,1)
+ assert_raise(NoMethodError) do
+ d.prev
+ end
+ end
+
+ def test_prev_day
+ d = Date.new(2001,1,1).prev_day
+ assert_equal([2000, 12, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2001,1,1).prev_day(2)
+ assert_equal([2000, 12, 30], [d.year, d.mon, d.mday])
+ d = Date.new(2000,12,31).prev_day(-2)
+ assert_equal([2001, 1, 2], [d.year, d.mon, d.mday])
+
+ d = DateTime.new(2000,3,1).prev_day(1.to_r/2)
+ assert_equal([2000, 2, 29, 12, 0, 0], [d.year, d.mon, d.mday, d.hour, d.min, d.sec])
+ end
+
+ def test_prev_month
+ d = Date.new(2000,1,31) << -1
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) << 1
+ assert_equal([1999, 12, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) << 12
+ assert_equal([1999, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) << 14
+ assert_equal([1998, 11, 30], [d.year, d.mon, d.mday])
+
+ end
+
+ def test_prev_month__2
+ d = Date.new(2000,1,31).prev_month(-1)
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_month
+ assert_equal([1999, 12, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_month(12)
+ assert_equal([1999, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_month(14)
+ assert_equal([1998, 11, 30], [d.year, d.mon, d.mday])
+ end
+
+ def test_prev_year
+ d = Date.new(2000,1,31).prev_year(-1)
+ assert_equal([2001, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_year
+ assert_equal([1999, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_year(10)
+ assert_equal([1990, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).prev_year(100)
+ assert_equal([1900, 1, 31], [d.year, d.mon, d.mday])
+ end
+
+ def test_next
+ d = Date.new(2000,12,31).next
+ assert_equal([2001, 1, 1], [d.year, d.mon, d.mday])
+ d = Date.new(2000,12,31).succ
+ assert_equal([2001, 1, 1], [d.year, d.mon, d.mday])
+
+ d = Date.today
+ d2 = d.next
+ assert_equal(d, (d2 - 1))
+ d = Date.today
+ d2 = d.succ
+ assert_equal(d, (d2 - 1))
+
+ d = DateTime.now
+ d2 = d.next
+ assert_equal(d, (d2 - 1))
+ d = DateTime.now
+ d2 = d.succ
+ assert_equal(d, (d2 - 1))
+ end
+
+ def test_next_day
+ d = Date.new(2000,12,31).next_day
+ assert_equal([2001, 1, 1], [d.year, d.mon, d.mday])
+ d = Date.new(2000,12,31).next_day(2)
+ assert_equal([2001, 1, 2], [d.year, d.mon, d.mday])
+ d = Date.new(2001,1,1).next_day(-2)
+ assert_equal([2000, 12, 30], [d.year, d.mon, d.mday])
+
+ d = DateTime.new(2000,2,29).next_day(1.to_r/2)
+ assert_equal([2000, 2, 29, 12, 0, 0], [d.year, d.mon, d.mday, d.hour, d.min, d.sec])
+ end
+
+ def test_next_month
+ d = Date.new(2000,1,31) >> -1
+ assert_equal([1999, 12, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) >> 1
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) >> 12
+ assert_equal([2001, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31) >> 13
+ assert_equal([2001, 2, 28], [d.year, d.mon, d.mday])
+ end
+
+ def test_next_month__2
+ d = Date.new(2000,1,31).next_month(-1)
+ assert_equal([1999, 12, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_month
+ assert_equal([2000, 2, 29], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_month(12)
+ assert_equal([2001, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_month(13)
+ assert_equal([2001, 2, 28], [d.year, d.mon, d.mday])
+ end
+
+ def test_next_year
+ d = Date.new(2000,1,31).next_year(-1)
+ assert_equal([1999, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_year
+ assert_equal([2001, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_year(10)
+ assert_equal([2010, 1, 31], [d.year, d.mon, d.mday])
+ d = Date.new(2000,1,31).next_year(100)
+ assert_equal([2100, 1, 31], [d.year, d.mon, d.mday])
+ end
+
+ def test_downto
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,7)
+ i = 0
+ p.downto(q) do |d|
+ i += 1
+ end
+ assert_equal(8, i)
+ end
+
+ def test_downto__noblock
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,7)
+ e = p.downto(q)
+ assert_equal(8, e.to_a.size)
+ end
+
+ def test_upto
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,21)
+ i = 0
+ p.upto(q) do |d|
+ i += 1
+ end
+ assert_equal(8, i)
+ end
+
+ def test_upto__noblock
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,21)
+ e = p.upto(q)
+ assert_equal(8, e.to_a.size)
+ end
+
+ def test_step
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,21)
+ i = 0
+ p.step(q, 2) do |d|
+ i += 1
+ end
+ assert_equal(4, i)
+
+ i = 0
+ p.step(q) do |d|
+ i += 1
+ end
+ assert_equal(8, i)
+ end
+
+ def test_step__noblock
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,21)
+ e = p.step(q, 2)
+ assert_equal(4, e.to_a.size)
+
+ e = p.step(q)
+ assert_equal(8, e.to_a.size)
+ end
+
+=begin
+ def test_step__inf
+ p = Date.new(2001,1,14)
+ q = Date.new(2001,1,21)
+ inf = 1.0/0
+
+ if inf.infinite?
+ [p, q].each do |a|
+ [p, q].each do |b|
+ [inf, -inf].each do |c|
+ i = 0
+ a.step(b, c) do |d|
+ i += 1
+ end
+ assert_equal(0, i)
+ end
+ end
+ end
+ end
+ end
+=end
+
+end
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