require 'test/unit'

class TestHash < Test::Unit::TestCase
  def test_hash
    x = {1=>2, 2=>4, 3=>6}
    y = {1, 2, 2, 4, 3, 6}

    assert_equal(2, x[1])

    assert(begin
         for k,v in y
           raise if k*2 != v
         end
         true
       rescue
         false
       end)

    assert_equal(3, x.length)
    assert(x.has_key?(1))
    assert(x.has_value?(4))
    assert_equal([4,6], x.values_at(2,3))
    assert_equal({1=>2, 2=>4, 3=>6}, x)

    z = y.keys.join(":")
    assert_equal("1:2:3", z)

    z = y.values.join(":")
    assert_equal("2:4:6", z)
    assert_equal(x, y)

    y.shift
    assert_equal(2, y.length)

    z = [1,2]
    y[z] = 256
    assert_equal(256, y[z])

    x = Hash.new(0)
    x[1] = 1
    assert_equal(1, x[1])
    assert_equal(0, x[2])

    x = Hash.new([])
    assert_equal([], x[22])
    assert_same(x[22], x[22])

    x = Hash.new{[]}
    assert_equal([], x[22])
    assert_not_same(x[22], x[22])

    x = Hash.new{|h,k| z = k; h[k] = k*2}
    z = 0
    assert_equal(44, x[22])
    assert_equal(22, z)
    z = 0
    assert_equal(44, x[22])
    assert_equal(0, z)
    x.default = 5
    assert_equal(5, x[23])

    x = Hash.new
    def x.default(k)
      $z = k
      self[k] = k*2
    end
    $z = 0
    assert_equal(44, x[22])
    assert_equal(22, $z)
    $z = 0
    assert_equal(44, x[22])
    assert_equal(0, $z)
  end
end