require 'test/unit'

class TestFixnum < Test::Unit::TestCase
  def setup
    @verbose = $VERBOSE
    $VERBOSE = nil
  end

  def teardown
    $VERBOSE = @verbose
  end

  def test_pow
    [1, 2, 2**64, 2**63*3, 2**64*3].each do |y|
      [1, 3].each do |x|
        z1 = x**y
        z2 = (-x)**y
        if y % 2 == 1
          assert_equal(z2, -z1)
        else
          assert_equal(z2, z1)
        end
      end
    end
  end

  def test_succ
    assert_equal(0x40000000, 0x3fffffff.succ, "[ruby-dev:31189]")
    assert_equal(0x4000000000000000, 0x3fffffffffffffff.succ, "[ruby-dev:31190]")
  end

  def test_pred
    assert_equal(-0x40000001, (-0x40000000).pred)
    assert_equal(-0x4000000000000001, (-0x4000000000000000).pred)
  end

  def test_plus
    assert_equal(0x40000000, 0x3fffffff+1)
    assert_equal(0x4000000000000000, 0x3fffffffffffffff+1)
    assert_equal(-0x40000001, (-0x40000000)+(-1))
    assert_equal(-0x4000000000000001, (-0x4000000000000000)+(-1))
    assert_equal(-0x80000000, (-0x40000000)+(-0x40000000))
  end

  def test_sub
    assert_equal(0x40000000, 0x3fffffff-(-1))
    assert_equal(0x4000000000000000, 0x3fffffffffffffff-(-1))
    assert_equal(-0x40000001, (-0x40000000)-1)
    assert_equal(-0x4000000000000001, (-0x4000000000000000)-1)
    assert_equal(-0x80000000, (-0x40000000)-0x40000000)
  end

  def test_mult
    assert_equal(0x40000000, 0x20000000*2)
    assert_equal(0x4000000000000000, 0x2000000000000000*2)
    assert_equal(-0x40000001, 33025*(-32513))
    assert_equal(-0x4000000000000001, 1380655685*(-3340214413))
    assert_equal(0x40000000, (-0x40000000)*(-1))
  end

  def test_div
    assert_equal(0x40000000, 0xc0000000/3)
    assert_equal(0x4000000000000000, 0xc000000000000000/3)
    assert_equal(-0x40000001, 0xc0000003/(-3))
    assert_equal(-0x4000000000000001, 0xc000000000000003/(-3))
    assert_equal(0x40000000, (-0x40000000)/(-1), "[ruby-dev:31210]")
    assert_equal(0x4000000000000000, (-0x4000000000000000)/(-1))
  end
end