require 'test_helper'
 
class IPv4Test < Minitest::Test

  def setup
    @klass = IPAddress::IPv4

    @valid_ipv4 = {
      "0.0.0.0/0" => ["0.0.0.0", 0],
      "10.0.0.0" => ["10.0.0.0", 32],
      "10.0.0.1" => ["10.0.0.1", 32],
      "10.0.0.1/24" => ["10.0.0.1", 24],
      "10.0.0.1/255.255.255.0" => ["10.0.0.1", 24]}
    
    @invalid_ipv4 = ["10.0.0.256",
                     "10.0.0.0.0",
                     "10.0.0",
                     "10.0"]

    @valid_ipv4_range = ["10.0.0.1-254",
                         "10.0.1-254.0",
                         "10.1-254.0.0"]

    @netmask_values = {
      "0.0.0.0/0"        => "0.0.0.0",
      "10.0.0.0/8"       => "255.0.0.0",
      "172.16.0.0/16"    => "255.255.0.0",
      "192.168.0.0/24"   => "255.255.255.0",
      "192.168.100.4/30" => "255.255.255.252",
      "192.168.12.4/32"  => "255.255.255.255"}

    @decimal_values ={      
      "0.0.0.0/0"        => 0,
      "10.0.0.0/8"       => 167772160,
      "172.16.0.0/16"    => 2886729728,
      "192.168.0.0/24"   => 3232235520,
      "192.168.100.4/30" => 3232261124}

    @hex_values = {
      "10.0.0.0"         => "0a000000",
      "172.16.5.4"       => "ac100504",
      "192.168.100.4"    => "c0a86404",
    }

    @ip = @klass.new("172.16.10.1/24")
    @network = @klass.new("172.16.10.0/24")
    
    @broadcast = {
      "10.0.0.0/8"       => "10.255.255.255/8",
      "172.16.0.0/16"    => "172.16.255.255/16",
      "192.168.0.0/24"   => "192.168.0.255/24",
      "192.168.100.4/30" => "192.168.100.7/30",
      "192.168.12.3/31"  => "255.255.255.255/31",
      "10.0.0.1/32"      => "10.0.0.1/32"}
    
    @networks = {
      "10.5.4.3/8"       => "10.0.0.0/8",
      "172.16.5.4/16"    => "172.16.0.0/16",
      "192.168.4.3/24"   => "192.168.4.0/24",
      "192.168.100.5/30" => "192.168.100.4/30",
      "192.168.1.3/31"   => "192.168.1.2/31",
      "192.168.2.5/32"   => "192.168.2.5/32"}

    @class_a = @klass.new("10.0.0.1/8")
    @class_b = @klass.new("172.16.0.1/16")
    @class_c = @klass.new("192.168.0.1/24")

    @classful = {
      "10.1.1.1"  => 8,
      "150.1.1.1" => 16,
      "200.1.1.1" => 24 }

    @in_range = {
      "10.32.0.1" => ["10.32.0.253", 253],
      "192.0.0.0" => ["192.1.255.255", 131072]
    }

    @link_local = [
      "169.254.0.0",
      "169.254.255.255",
      "169.254.12.34",
      "169.254.0.0/16",
      "169.254.0.0/17"]
    
    @not_link_local = [
      "127.0.0.1",
      "127.0.1.1",
      "192.168.0.100",
      "169.255.0.0",
      "169.254.0.0/15",
      "0.0.0.0",
      "255.255.255.255"]
    
  end

  def test_initialize
    @valid_ipv4.keys.each do |i|
      ip = @klass.new(i)
      assert_instance_of @klass, ip
    end
    assert_instance_of IPAddress::Prefix32, @ip.prefix
    assert_raises(ArgumentError) do
      @klass.new 
    end
  end

  def test_initialize_format_error
    @invalid_ipv4.each do |i|
      assert_raises(ArgumentError) {@klass.new(i)}
    end
    assert_raises (ArgumentError) {@klass.new(nil)}
    assert_raises (ArgumentError) {@klass.new("10.0.0.0/asd")}
  end

  def test_initialize_without_prefix
    ip = @klass.new("10.10.0.0")
    assert_instance_of IPAddress::Prefix32, ip.prefix
    assert_equal 32, ip.prefix.to_i
  end

  def test_attributes
    @valid_ipv4.each do |arg,attr|
      ip = @klass.new(arg)
      assert_equal attr.first, ip.address
      assert_equal attr.last, ip.prefix.to_i
    end
  end

  def test_octets
    ip = @klass.new("10.1.2.3/8")
    assert_equal ip.octets, [10,1,2,3]
  end
  
  def test_initialize_should_require_ip
    assert_raises(ArgumentError) { @klass.new }
  end

  def test_method_as_json
    ip = @klass.new("172.16.100.4/22")
    assert_equal "172.16.100.4/22", ip.as_json
  end

  def test_method_data
    if RUBY_VERSION < "2.0"
      assert_equal "\254\020\n\001", @ip.data
    else
      assert_equal "\xAC\x10\n\x01".b, @ip.data
    end
  end
  
  def test_method_to_string
    @valid_ipv4.each do |arg,attr|
      ip = @klass.new(arg)
      assert_equal attr.join("/"), ip.to_string
    end
  end

  def test_method_to_s
    @valid_ipv4.each do |arg,attr|
      ip = @klass.new(arg)
      assert_equal attr.first, ip.to_s
    end
  end

  def test_netmask
    @netmask_values.each do |addr,mask|
      ip = @klass.new(addr)
      assert_equal mask, ip.netmask
    end
  end

  def test_method_to_u32
    @decimal_values.each do |addr,int|
      ip = @klass.new(addr)
      assert_equal int, ip.to_u32
    end
  end

  def test_method_to_hex
    @hex_values.each do |addr,hex|
      ip = @klass.new(addr)
      assert_equal hex, ip.to_hex
    end
  end

  def test_method_network?
    assert_equal true, @network.network?
    assert_equal false, @ip.network?
  end
  
  def test_one_address_network
    network = @klass.new("172.16.10.1/32")
    assert_equal false, network.network?
  end

  def test_method_broadcast
    @broadcast.each do |addr,bcast|
      ip = @klass.new(addr)
      assert_instance_of @klass, ip.broadcast
      assert_equal bcast, ip.broadcast.to_string
    end
  end
  
  def test_method_network
    @networks.each do |addr,net|
      ip = @klass.new addr
      assert_instance_of @klass, ip.network
      assert_equal net, ip.network.to_string
    end
  end

  def test_method_bits
    ip = @klass.new("127.0.0.1")
    assert_equal "01111111000000000000000000000001", ip.bits
  end

  def test_method_first
    ip = @klass.new("192.168.100.0/24")
    assert_instance_of @klass, ip.first
    assert_equal "192.168.100.1", ip.first.to_s
    ip = @klass.new("192.168.100.50/24")
    assert_instance_of @klass, ip.first
    assert_equal "192.168.100.1", ip.first.to_s
    ip = @klass.new("192.168.100.50/32")
    assert_instance_of @klass, ip.first
    assert_equal "192.168.100.50", ip.first.to_s
    ip = @klass.new("192.168.100.50/31")
    assert_instance_of @klass, ip.first
    assert_equal "192.168.100.50", ip.first.to_s
  end

  def test_method_last
    ip = @klass.new("192.168.100.0/24")
    assert_instance_of @klass, ip.last
    assert_equal  "192.168.100.254", ip.last.to_s
    ip = @klass.new("192.168.100.50/24")
    assert_instance_of @klass, ip.last
    assert_equal  "192.168.100.254", ip.last.to_s
    ip = @klass.new("192.168.100.50/32")
    assert_instance_of @klass, ip.last
    assert_equal  "192.168.100.50", ip.last.to_s
    ip = @klass.new("192.168.100.50/31")
    assert_instance_of @klass, ip.last
    assert_equal  "192.168.100.51", ip.last.to_s
  end
  
  def test_method_each_host
    ip = @klass.new("10.0.0.1/29")
    arr = []
    ip.each_host {|i| arr << i.to_s}
    expected = ["10.0.0.1","10.0.0.2","10.0.0.3",
                "10.0.0.4","10.0.0.5","10.0.0.6"]
    assert_equal expected, arr
  end

  def test_method_each
    ip = @klass.new("10.0.0.1/29")
    arr = []
    ip.each {|i| arr << i.to_s}
    expected = ["10.0.0.0","10.0.0.1","10.0.0.2",
                "10.0.0.3","10.0.0.4","10.0.0.5",
                "10.0.0.6","10.0.0.7"]
    assert_equal expected, arr
  end

  def test_method_succ
    ip = @klass.new("192.168.100.0/24")
    assert_instance_of @klass, ip.succ
    assert_equal  "192.168.100.1/24", ip.succ.to_string
    ip = @klass.new("192.168.100.50/24")
    assert_instance_of @klass, ip.succ
    assert_equal  "192.168.100.51/24", ip.succ.to_string
    ip = @klass.new("0.0.0.0/32")
    assert_instance_of @klass, ip.succ
    assert_equal  "0.0.0.1/32", ip.succ.to_string
    ip = @klass.new("255.255.255.255/32")
    assert_instance_of @klass, ip.succ
    assert_equal  "0.0.0.0/32", ip.succ.to_string
  end

  def test_method_pred
    ip = @klass.new("192.168.100.0/24")
    assert_instance_of @klass, ip.pred
    assert_equal  "192.168.99.255/24", ip.pred.to_string
    ip = @klass.new("192.168.100.50/24")
    assert_instance_of @klass, ip.pred
    assert_equal  "192.168.100.49/24", ip.pred.to_string
    ip = @klass.new("0.0.0.0/32")
    assert_instance_of @klass, ip.pred
    assert_equal  "255.255.255.255/32", ip.pred.to_string
    ip = @klass.new("255.255.255.255/32")
    assert_instance_of @klass, ip.pred
    assert_equal  "255.255.255.254/32", ip.pred.to_string
  end

  def test_method_size
    ip = @klass.new("10.0.0.1/29")
    assert_equal 8, ip.size
  end

  def test_method_hosts
    ip = @klass.new("10.0.0.1/29")
    expected = ["10.0.0.1","10.0.0.2","10.0.0.3",
                "10.0.0.4","10.0.0.5","10.0.0.6"]
    assert_equal expected, ip.hosts.map {|i| i.to_s}
  end

  def test_method_network_u32
    assert_equal 2886732288, @ip.network_u32
  end
  
  def test_method_broadcast_u32
    assert_equal 2886732543, @ip.broadcast_u32
  end

  def test_method_include?
    ip = @klass.new("192.168.10.100/24")
    addr = @klass.new("192.168.10.102/24")
    assert_equal true, ip.include?(addr)
    assert_equal false, ip.include?(@klass.new("172.16.0.48"))
    ip = @klass.new("10.0.0.0/8")
    assert_equal true, ip.include?(@klass.new("10.0.0.0/9"))
    assert_equal true, ip.include?(@klass.new("10.1.1.1/32"))
    assert_equal true, ip.include?(@klass.new("10.1.1.1/9"))
    assert_equal false, ip.include?(@klass.new("172.16.0.0/16"))
    assert_equal false, ip.include?(@klass.new("10.0.0.0/7"))
    assert_equal false, ip.include?(@klass.new("5.5.5.5/32"))
    assert_equal false, ip.include?(@klass.new("11.0.0.0/8"))
    ip = @klass.new("13.13.0.0/13")
    assert_equal false, ip.include?(@klass.new("13.16.0.0/32"))    
  end

  def test_method_include_all?
    ip = @klass.new("192.168.10.100/24")
    addr1 = @klass.new("192.168.10.102/24")
    addr2 = @klass.new("192.168.10.103/24")    
    assert_equal true, ip.include_all?(addr1,addr2)
    assert_equal false, ip.include_all?(addr1, @klass.new("13.16.0.0/32"))
  end

  def test_method_ipv4?
    assert_equal true, @ip.ipv4?
  end
  
  def test_method_ipv6?
    assert_equal false, @ip.ipv6?
  end
    
  def test_method_private?
    assert_equal true, @klass.new("192.168.10.50/24").private?
    assert_equal true, @klass.new("192.168.10.50/16").private?
    assert_equal true, @klass.new("172.16.77.40/24").private?
    assert_equal true, @klass.new("172.16.10.50/14").private?
    assert_equal true, @klass.new("10.10.10.10/10").private?
    assert_equal true, @klass.new("10.0.0.0/8").private?
    assert_equal false, @klass.new("192.168.10.50/12").private?
    assert_equal false, @klass.new("3.3.3.3").private?
    assert_equal false, @klass.new("10.0.0.0/7").private?
    assert_equal false, @klass.new("172.32.0.0/12").private?
    assert_equal false, @klass.new("172.16.0.0/11").private?
    assert_equal false, @klass.new("192.0.0.2/24").private?
  end

  def test_method_link_local?
    @link_local.each do |addr|
      assert_equal true, @klass.new(addr).link_local?
    end
    @not_link_local.each do |addr|
      assert_equal false, @klass.new(addr).link_local?
    end
  end

  def test_method_octet
    assert_equal 172, @ip[0]
    assert_equal 16, @ip[1]
    assert_equal 10, @ip[2]
    assert_equal 1, @ip[3]
  end

  def test_method_a?
    assert_equal true, @class_a.a?
    assert_equal false, @class_b.a?
    assert_equal false, @class_c.a?
  end

  def test_method_b?
    assert_equal true, @class_b.b?
    assert_equal false, @class_a.b?
    assert_equal false, @class_c.b?
  end

  def test_method_c?
    assert_equal true, @class_c.c?
    assert_equal false, @class_a.c?
    assert_equal false, @class_b.c?
  end

  def test_method_to_ipv6
    assert_equal "ac10:0a01", @ip.to_ipv6
  end
  
  def test_method_reverse
    assert_equal "1.10.16.172.in-addr.arpa", @ip.reverse
  end
  
  def test_method_compare
    ip1 = @klass.new("10.1.1.1/8")
    ip2 = @klass.new("10.1.1.1/16")
    ip3 = @klass.new("172.16.1.1/14")
    ip4 = @klass.new("10.1.1.1/8")

    # ip2 should be greater than ip1
    assert_equal true, ip1 < ip2
    assert_equal false, ip1 > ip2
    assert_equal false, ip2 < ip1        
    # ip2 should be less than ip3
    assert_equal true, ip2 < ip3
    assert_equal false, ip2 > ip3
    # ip1 should be less than ip3
    assert_equal true, ip1 < ip3
    assert_equal false, ip1 > ip3
    assert_equal false, ip3 < ip1
    # ip1 should be equal to itself
    assert_equal true, ip1 == ip1
    # ip1 should be equal to ip4
    assert_equal true, ip1 == ip4
    # test sorting
    arr = ["10.1.1.1/8","10.1.1.1/16","172.16.1.1/14"]
    assert_equal arr, [ip1,ip2,ip3].sort.map{|s| s.to_string}
    # test same prefix
    ip1 = @klass.new("10.0.0.0/24")
    ip2 = @klass.new("10.0.0.0/16")
    ip3 = @klass.new("10.0.0.0/8")
    arr = ["10.0.0.0/8","10.0.0.0/16","10.0.0.0/24"]
    assert_equal arr, [ip1,ip2,ip3].sort.map{|s| s.to_string}
    # compare with alien thing
    ip1 = @klass.new('127.0.0.1')
    ip2 = IPAddress::IPv6.new('::1')
    not_ip = String
    assert_nil ip1 <=> ip2
    assert_nil ip1 <=> not_ip
  end

  def test_method_minus
    ip1 = @klass.new("10.1.1.1/8")
    ip2 = @klass.new("10.1.1.10/8")    
    assert_equal 9, ip2 - ip1
    assert_equal 9, ip1 - ip2
  end

  def test_method_plus
    ip1 = @klass.new("172.16.10.1/24")
    ip2 = @klass.new("172.16.11.2/24")
    assert_equal ["172.16.10.0/23"], (ip1+ip2).map{|i| i.to_string}

    ip2 = @klass.new("172.16.12.2/24")
    assert_equal [ip1.network.to_string, ip2.network.to_string], 
    (ip1 + ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.0.2.0/24")
    assert_equal ["10.0.0.0/23","10.0.2.0/24"], (ip1+ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.0.2.0/24")
    assert_equal ["10.0.0.0/23","10.0.2.0/24"], (ip2+ip1).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/16")
    ip2 = @klass.new("10.0.2.0/24")
    assert_equal ["10.0.0.0/16"], (ip1+ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.1.0.0/24")
    assert_equal ["10.0.0.0/23","10.1.0.0/24"], (ip1+ip2).map{|i| i.to_string}

  end
  
  def test_method_netmask_equal
    ip = @klass.new("10.1.1.1/16")
    assert_equal 16, ip.prefix.to_i
    ip.netmask = "255.255.255.0"
    assert_equal 24, ip.prefix.to_i
  end

  def test_method_split
    assert_raises(ArgumentError) {@ip.split(0)}
    assert_raises(ArgumentError) {@ip.split(257)}
    
    assert_equal @ip.network, @ip.split(1).first
    
    arr = ["172.16.10.0/27", "172.16.10.32/27", "172.16.10.64/27", 
           "172.16.10.96/27", "172.16.10.128/27", "172.16.10.160/27", 
           "172.16.10.192/27", "172.16.10.224/27"]
    assert_equal arr, @network.split(8).map {|s| s.to_string}
    arr = ["172.16.10.0/27", "172.16.10.32/27", "172.16.10.64/27", 
           "172.16.10.96/27", "172.16.10.128/27", "172.16.10.160/27", 
           "172.16.10.192/26"]
    assert_equal arr, @network.split(7).map {|s| s.to_string}
    arr = ["172.16.10.0/27", "172.16.10.32/27", "172.16.10.64/27", 
           "172.16.10.96/27", "172.16.10.128/26", "172.16.10.192/26"]
    assert_equal arr, @network.split(6).map {|s| s.to_string}
    arr = ["172.16.10.0/27", "172.16.10.32/27", "172.16.10.64/27", 
           "172.16.10.96/27", "172.16.10.128/25"]
    assert_equal arr, @network.split(5).map {|s| s.to_string}
    arr = ["172.16.10.0/26", "172.16.10.64/26", "172.16.10.128/26", 
           "172.16.10.192/26"]
    assert_equal arr, @network.split(4).map {|s| s.to_string}
    arr = ["172.16.10.0/26", "172.16.10.64/26", "172.16.10.128/25"]
    assert_equal arr, @network.split(3).map {|s| s.to_string}
    arr = ["172.16.10.0/25", "172.16.10.128/25"]
    assert_equal arr, @network.split(2).map {|s| s.to_string}
    arr = ["172.16.10.0/24"]
    assert_equal arr, @network.split(1).map {|s| s.to_string}
  end

  def test_method_subnet
    assert_raises(ArgumentError) {@network.subnet(23)}
    assert_raises(ArgumentError) {@network.subnet(33)}
    arr = ["172.16.10.0/26", "172.16.10.64/26", "172.16.10.128/26", 
           "172.16.10.192/26"]
    assert_equal arr, @network.subnet(26).map {|s| s.to_string}
    arr = ["172.16.10.0/25", "172.16.10.128/25"]
    assert_equal arr, @network.subnet(25).map {|s| s.to_string}
    arr = ["172.16.10.0/24"]
    assert_equal arr, @network.subnet(24).map {|s| s.to_string}
  end
  
  def test_method_supernet
    assert_raises(ArgumentError) {@ip.supernet(24)}     
    assert_equal "0.0.0.0/0", @ip.supernet(0).to_string
    assert_equal "0.0.0.0/0", @ip.supernet(-2).to_string
    assert_equal "172.16.10.0/23", @ip.supernet(23).to_string
    assert_equal "172.16.8.0/22", @ip.supernet(22).to_string
  end

  def test_classmethod_parse_u32
    @decimal_values.each do  |addr,int|
      ip = @klass.parse_u32(int)
      ip.prefix = addr.split("/").last.to_i
      assert_equal ip.to_string, addr
    end
  end

  def test_classhmethod_extract
    str = "foobar172.16.10.1barbaz"
    assert_equal "172.16.10.1", @klass.extract(str).to_s
  end

  def test_classmethod_summarize
    
    # Should return self if only one network given
    assert_equal [@ip.network], @klass.summarize(@ip)

    # Summarize homogeneous networks
    ip1 = @klass.new("172.16.10.1/24")
    ip2 = @klass.new("172.16.11.2/24")
    assert_equal ["172.16.10.0/23"], @klass.summarize(ip1,ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.1/24")
    ip2 = @klass.new("10.0.1.1/24")
    ip3 = @klass.new("10.0.2.1/24")
    ip4 = @klass.new("10.0.3.1/24")
    assert_equal ["10.0.0.0/22"], @klass.summarize(ip1,ip2,ip3,ip4).map{|i| i.to_string}
    assert_equal ["10.0.0.0/22"], @klass.summarize(ip4,ip3,ip2,ip1).map{|i| i.to_string}

    # Summarize non homogeneous networks
    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.0.2.0/24")
    assert_equal ["10.0.0.0/23","10.0.2.0/24"], @klass.summarize(ip1,ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/16")
    ip2 = @klass.new("10.0.2.0/24")
    assert_equal ["10.0.0.0/16"], @klass.summarize(ip1,ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.1.0.0/24")
    assert_equal ["10.0.0.0/23","10.1.0.0/24"], @klass.summarize(ip1,ip2).map{|i| i.to_string}

    ip1 = @klass.new("10.0.0.0/23")
    ip2 = @klass.new("10.0.2.0/23")
    ip3 = @klass.new("10.0.4.0/24")
    ip4 = @klass.new("10.0.6.0/24")
    assert_equal ["10.0.0.0/22","10.0.4.0/24","10.0.6.0/24"], 
              @klass.summarize(ip1,ip2,ip3,ip4).map{|i| i.to_string}

    ip1 = @klass.new("10.0.1.1/24")
    ip2 = @klass.new("10.0.2.1/24")
    ip3 = @klass.new("10.0.3.1/24")
    ip4 = @klass.new("10.0.4.1/24")
    result = ["10.0.1.0/24","10.0.2.0/23","10.0.4.0/24"]
    assert_equal result, @klass.summarize(ip1,ip2,ip3,ip4).map{|i| i.to_string}
    assert_equal result, @klass.summarize(ip4,ip3,ip2,ip1).map{|i| i.to_string}

    ip1 = @klass.new("10.0.1.1/24")
    ip2 = @klass.new("10.10.2.1/24")
    ip3 = @klass.new("172.16.0.1/24")
    ip4 = @klass.new("172.16.1.1/24")
    result = ["10.0.1.0/24","10.10.2.0/24","172.16.0.0/23"]
    assert_equal result, @klass.summarize(ip1,ip2,ip3,ip4).map{|i| i.to_string}

    ips = [@klass.new("10.0.0.12/30"),
           @klass.new("10.0.100.0/24")]
    result = ["10.0.0.12/30", "10.0.100.0/24"]
    assert_equal result, @klass.summarize(*ips).map{|i| i.to_string}

    ips = [@klass.new("172.16.0.0/31"),
           @klass.new("10.10.2.1/32")]
    result = ["10.10.2.1/32", "172.16.0.0/31"]
    assert_equal result, @klass.summarize(*ips).map{|i| i.to_string}    
           
    ips = [@klass.new("172.16.0.0/32"),
           @klass.new("10.10.2.1/32")]
    result = ["10.10.2.1/32", "172.16.0.0/32"]
    assert_equal result, @klass.summarize(*ips).map{|i| i.to_string}    

  end

  def test_classmethod_parse_data
    ip = @klass.parse_data "\254\020\n\001"
    assert_instance_of @klass, ip
    assert_equal "172.16.10.1", ip.address
    assert_equal "172.16.10.1/32", ip.to_string
  end

  def test_classmethod_parse_classful
    @classful.each do |ip,prefix|
      res = @klass.parse_classful(ip)
      assert_equal prefix, res.prefix
      assert_equal "#{ip}/#{prefix}", res.to_string
    end
    assert_raises(ArgumentError){ @klass.parse_classful("192.168.256.257") }
  end
  
  def test_network_split
    @classful.each do |ip,net|
      x = @klass.new("#{ip}/#{net}") 
      assert_equal x.split(1).length, 1
      assert_equal x.split(2).length, 2
      assert_equal x.split(32).length, 32
      assert_equal x.split(256).length, 256
    end
  end

  def test_in_range
    @in_range.each do |s,d|
      ip = @klass.new(s)
      assert_equal ip.to(d[0]).length, d[1]  
    end
  end

  def test_octect_updates
    ip = @klass.new("10.0.1.15/32")
    ip[1] = 15
    assert_equal "10.15.1.15/32", ip.to_string

    ip = @klass.new("172.16.100.1")
    ip[3] = 200
    assert_equal "172.16.100.200/32", ip.to_string

    ip = @klass.new("192.168.199.0/24")
    ip[2] = 200
    assert_equal "192.168.200.0/24", ip.to_string
  end

  def test_allocate_addresses
    ip = @klass.new("10.0.0.0/24")
    ip1 = ip.allocate
    ip2 = ip.allocate
    ip3 = ip.allocate
    assert_equal "10.0.0.1/24", ip1.to_string
    assert_equal "10.0.0.2/24", ip2.to_string
    assert_equal "10.0.0.3/24", ip3.to_string
  end

  def test_allocate_can_skip_addresses
    ip = @klass.new("10.0.0.0/24")
    ip1 = ip.allocate(2)
    assert_equal "10.0.0.3/24", ip1.to_string
  end

  def test_allocate_will_raise_stopiteration
    ip = @klass.new("10.0.0.0/30")
    ip.allocate(3)
    assert_raises (StopIteration) do
      ip.allocate
    end
  end

  def test_finds_adjacent_subnet
    ip = @klass.new("10.0.0.0/24")
    assert_equal "10.0.1.0/24", ip.find_adjacent_subnet
    refute @klass.new("10.0.0.0/0").find_adjacent_subnet 
    assert_equal "10.0.0.0/8", @klass.new("11.0.0.0/8").find_adjacent_subnet 
    assert_equal "172.16.0.0/16", @klass.new("172.17.0.0/16").find_adjacent_subnet 
    assert_equal "192.168.4.0/24", @klass.new("192.168.5.0/24").find_adjacent_subnet 
    assert_equal "192.168.100.4/30", @klass.new("192.168.100.0/30").find_adjacent_subnet 
    assert_equal "192.168.1.2/31", @klass.new("192.168.1.0/31").find_adjacent_subnet 
    assert_equal "192.168.2.5/32", @klass.new("192.168.2.4/32").find_adjacent_subnet 
  end

end # class IPv4Test