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+'use strict';
+
+var ip = require('..');
+var assert = require('assert');
+var net = require('net');
+var os = require('os');
+
+describe('IP library for node.js', function() {
+  describe('toBuffer()/toString() methods', function() {
+    it('should convert to buffer IPv4 address', function() {
+      var buf = ip.toBuffer('127.0.0.1');
+      assert.equal(buf.toString('hex'), '7f000001');
+      assert.equal(ip.toString(buf), '127.0.0.1');
+    });
+
+    it('should convert to buffer IPv4 address in-place', function() {
+      var buf = Buffer.alloc(128);
+      var offset = 64;
+      ip.toBuffer('127.0.0.1', buf, offset);
+      assert.equal(buf.toString('hex', offset, offset + 4), '7f000001');
+      assert.equal(ip.toString(buf, offset, 4), '127.0.0.1');
+    });
+
+    it('should convert to buffer IPv6 address', function() {
+      var buf = ip.toBuffer('::1');
+      assert(/(00){15,15}01/.test(buf.toString('hex')));
+      assert.equal(ip.toString(buf), '::1');
+      assert.equal(ip.toString(ip.toBuffer('1::')), '1::');
+      assert.equal(ip.toString(ip.toBuffer('abcd::dcba')), 'abcd::dcba');
+    });
+
+    it('should convert to buffer IPv6 address in-place', function() {
+      var buf = Buffer.alloc(128);
+      var offset = 64;
+      ip.toBuffer('::1', buf, offset);
+      assert(/(00){15,15}01/.test(buf.toString('hex', offset, offset + 16)));
+      assert.equal(ip.toString(buf, offset, 16), '::1');
+      assert.equal(ip.toString(ip.toBuffer('1::', buf, offset),
+                               offset, 16), '1::');
+      assert.equal(ip.toString(ip.toBuffer('abcd::dcba', buf, offset),
+                               offset, 16), 'abcd::dcba');
+    });
+
+    it('should convert to buffer IPv6 mapped IPv4 address', function() {
+      var buf = ip.toBuffer('::ffff:127.0.0.1');
+      assert.equal(buf.toString('hex'), '00000000000000000000ffff7f000001');
+      assert.equal(ip.toString(buf), '::ffff:7f00:1');
+
+      buf = ip.toBuffer('ffff::127.0.0.1');
+      assert.equal(buf.toString('hex'), 'ffff000000000000000000007f000001');
+      assert.equal(ip.toString(buf), 'ffff::7f00:1');
+
+      buf = ip.toBuffer('0:0:0:0:0:ffff:127.0.0.1');
+      assert.equal(buf.toString('hex'), '00000000000000000000ffff7f000001');
+      assert.equal(ip.toString(buf), '::ffff:7f00:1');
+    });
+  });
+
+  describe('fromPrefixLen() method', function() {
+    it('should create IPv4 mask', function() {
+      assert.equal(ip.fromPrefixLen(24), '255.255.255.0');
+    });
+    it('should create IPv6 mask', function() {
+      assert.equal(ip.fromPrefixLen(64), 'ffff:ffff:ffff:ffff::');
+    });
+    it('should create IPv6 mask explicitly', function() {
+      assert.equal(ip.fromPrefixLen(24, 'IPV6'), 'ffff:ff00::');
+    });
+  });
+
+  describe('not() method', function() {
+    it('should reverse bits in address', function() {
+      assert.equal(ip.not('255.255.255.0'), '0.0.0.255');
+    });
+  });
+
+  describe('or() method', function() {
+    it('should or bits in ipv4 addresses', function() {
+      assert.equal(ip.or('0.0.0.255', '192.168.1.10'), '192.168.1.255');
+    });
+    it('should or bits in ipv6 addresses', function() {
+      assert.equal(ip.or('::ff', '::abcd:dcba:abcd:dcba'),
+                   '::abcd:dcba:abcd:dcff');
+    });
+    it('should or bits in mixed addresses', function() {
+      assert.equal(ip.or('0.0.0.255', '::abcd:dcba:abcd:dcba'),
+                   '::abcd:dcba:abcd:dcff');
+    });
+  });
+
+  describe('mask() method', function() {
+    it('should mask bits in address', function() {
+      assert.equal(ip.mask('192.168.1.134', '255.255.255.0'), '192.168.1.0');
+      assert.equal(ip.mask('192.168.1.134', '::ffff:ff00'), '::ffff:c0a8:100');
+    });
+
+    it('should not leak data', function() {
+      for (var i = 0; i < 10; i++)
+        assert.equal(ip.mask('::1', '0.0.0.0'), '::');
+    });
+  });
+
+  describe('subnet() method', function() {
+    // Test cases calculated with http://www.subnet-calculator.com/
+    var ipv4Subnet = ip.subnet('192.168.1.134', '255.255.255.192');
+
+    it('should compute ipv4 network address', function() {
+      assert.equal(ipv4Subnet.networkAddress, '192.168.1.128');
+    });
+
+    it('should compute ipv4 network\'s first address', function() {
+      assert.equal(ipv4Subnet.firstAddress, '192.168.1.129');
+    });
+
+    it('should compute ipv4 network\'s last address', function() {
+      assert.equal(ipv4Subnet.lastAddress, '192.168.1.190');
+    });
+
+    it('should compute ipv4 broadcast address', function() {
+      assert.equal(ipv4Subnet.broadcastAddress, '192.168.1.191');
+    });
+
+    it('should compute ipv4 subnet number of addresses', function() {
+      assert.equal(ipv4Subnet.length, 64);
+    });
+
+    it('should compute ipv4 subnet number of addressable hosts', function() {
+      assert.equal(ipv4Subnet.numHosts, 62);
+    });
+
+    it('should compute ipv4 subnet mask', function() {
+      assert.equal(ipv4Subnet.subnetMask, '255.255.255.192');
+    });
+
+    it('should compute ipv4 subnet mask\'s length', function() {
+      assert.equal(ipv4Subnet.subnetMaskLength, 26);
+    });
+
+    it('should know whether a subnet contains an address', function() {
+      assert.equal(ipv4Subnet.contains('192.168.1.180'), true);
+    });
+
+    it('should know whether a subnet does not contain an address', function() {
+      assert.equal(ipv4Subnet.contains('192.168.1.195'), false);
+    });
+  });
+
+  describe('subnet() method with mask length 32', function() {
+    // Test cases calculated with http://www.subnet-calculator.com/
+    var ipv4Subnet = ip.subnet('192.168.1.134', '255.255.255.255');
+    it('should compute ipv4 network\'s first address', function() {
+      assert.equal(ipv4Subnet.firstAddress, '192.168.1.134');
+    });
+
+    it('should compute ipv4 network\'s last address', function() {
+      assert.equal(ipv4Subnet.lastAddress, '192.168.1.134');
+    });
+
+    it('should compute ipv4 subnet number of addressable hosts', function() {
+      assert.equal(ipv4Subnet.numHosts, 1);
+    });
+  });
+
+  describe('subnet() method with mask length 31', function() {
+    // Test cases calculated with http://www.subnet-calculator.com/
+    var ipv4Subnet = ip.subnet('192.168.1.134', '255.255.255.254');
+    it('should compute ipv4 network\'s first address', function() {
+      assert.equal(ipv4Subnet.firstAddress, '192.168.1.134');
+    });
+
+    it('should compute ipv4 network\'s last address', function() {
+      assert.equal(ipv4Subnet.lastAddress, '192.168.1.135');
+    });
+
+    it('should compute ipv4 subnet number of addressable hosts', function() {
+      assert.equal(ipv4Subnet.numHosts, 2);
+    });
+  });
+
+  describe('cidrSubnet() method', function() {
+    // Test cases calculated with http://www.subnet-calculator.com/
+    var ipv4Subnet = ip.cidrSubnet('192.168.1.134/26');
+
+    it('should compute an ipv4 network address', function() {
+      assert.equal(ipv4Subnet.networkAddress, '192.168.1.128');
+    });
+
+    it('should compute an ipv4 network\'s first address', function() {
+      assert.equal(ipv4Subnet.firstAddress, '192.168.1.129');
+    });
+
+    it('should compute an ipv4 network\'s last address', function() {
+      assert.equal(ipv4Subnet.lastAddress, '192.168.1.190');
+    });
+
+    it('should compute an ipv4 broadcast address', function() {
+      assert.equal(ipv4Subnet.broadcastAddress, '192.168.1.191');
+    });
+
+    it('should compute an ipv4 subnet number of addresses', function() {
+      assert.equal(ipv4Subnet.length, 64);
+    });
+
+    it('should compute an ipv4 subnet number of addressable hosts', function() {
+      assert.equal(ipv4Subnet.numHosts, 62);
+    });
+
+    it('should compute an ipv4 subnet mask', function() {
+      assert.equal(ipv4Subnet.subnetMask, '255.255.255.192');
+    });
+
+    it('should compute an ipv4 subnet mask\'s length', function() {
+      assert.equal(ipv4Subnet.subnetMaskLength, 26);
+    });
+
+    it('should know whether a subnet contains an address', function() {
+      assert.equal(ipv4Subnet.contains('192.168.1.180'), true);
+    });
+
+    it('should know whether a subnet contains an address', function() {
+      assert.equal(ipv4Subnet.contains('192.168.1.195'), false);
+    });
+
+  });
+
+  describe('cidr() method', function() {
+    it('should mask address in CIDR notation', function() {
+      assert.equal(ip.cidr('192.168.1.134/26'), '192.168.1.128');
+      assert.equal(ip.cidr('2607:f0d0:1002:51::4/56'), '2607:f0d0:1002::');
+    });
+  });
+
+  describe('isEqual() method', function() {
+    it('should check if addresses are equal', function() {
+      assert(ip.isEqual('127.0.0.1', '::7f00:1'));
+      assert(!ip.isEqual('127.0.0.1', '::7f00:2'));
+      assert(ip.isEqual('127.0.0.1', '::ffff:7f00:1'));
+      assert(!ip.isEqual('127.0.0.1', '::ffaf:7f00:1'));
+      assert(ip.isEqual('::ffff:127.0.0.1', '::ffff:127.0.0.1'));
+      assert(ip.isEqual('::ffff:127.0.0.1', '127.0.0.1'));
+    });
+  });
+
+
+  describe('isPrivate() method', function() {
+    it('should check if an address is localhost', function() {
+      assert.equal(ip.isPrivate('127.0.0.1'), true);
+    });
+
+    it('should check if an address is from a 192.168.x.x network', function() {
+      assert.equal(ip.isPrivate('192.168.0.123'), true);
+      assert.equal(ip.isPrivate('192.168.122.123'), true);
+      assert.equal(ip.isPrivate('192.162.1.2'), false);
+    });
+
+    it('should check if an address is from a 172.16.x.x network', function() {
+      assert.equal(ip.isPrivate('172.16.0.5'), true);
+      assert.equal(ip.isPrivate('172.16.123.254'), true);
+      assert.equal(ip.isPrivate('171.16.0.5'), false);
+      assert.equal(ip.isPrivate('172.25.232.15'), true);
+      assert.equal(ip.isPrivate('172.15.0.5'), false);
+      assert.equal(ip.isPrivate('172.32.0.5'), false);
+    });
+
+    it('should check if an address is from a 169.254.x.x network', function() {
+      assert.equal(ip.isPrivate('169.254.2.3'), true);
+      assert.equal(ip.isPrivate('169.254.221.9'), true);
+      assert.equal(ip.isPrivate('168.254.2.3'), false);
+    });
+
+    it('should check if an address is from a 10.x.x.x network', function() {
+      assert.equal(ip.isPrivate('10.0.2.3'), true);
+      assert.equal(ip.isPrivate('10.1.23.45'), true);
+      assert.equal(ip.isPrivate('12.1.2.3'), false);
+    });
+
+    it('should check if an address is from a private IPv6 network', function() {
+      assert.equal(ip.isPrivate('fd12:3456:789a:1::1'), true);
+      assert.equal(ip.isPrivate('fe80::f2de:f1ff:fe3f:307e'), true);
+      assert.equal(ip.isPrivate('::ffff:10.100.1.42'), true);
+      assert.equal(ip.isPrivate('::FFFF:172.16.200.1'), true);
+      assert.equal(ip.isPrivate('::ffff:192.168.0.1'), true);
+    });
+
+    it('should check if an address is from the internet', function() {
+      assert.equal(ip.isPrivate('165.225.132.33'), false); // joyent.com
+    });
+
+    it('should check if an address is a loopback IPv6 address', function() {
+      assert.equal(ip.isPrivate('::'), true);
+      assert.equal(ip.isPrivate('::1'), true);
+      assert.equal(ip.isPrivate('fe80::1'), true);
+    });
+  });
+
+  describe('loopback() method', function() {
+    describe('undefined', function() {
+      it('should respond with 127.0.0.1', function() {
+        assert.equal(ip.loopback(), '127.0.0.1')
+      });
+    });
+
+    describe('ipv4', function() {
+      it('should respond with 127.0.0.1', function() {
+        assert.equal(ip.loopback('ipv4'), '127.0.0.1')
+      });
+    });
+
+    describe('ipv6', function() {
+      it('should respond with fe80::1', function() {
+        assert.equal(ip.loopback('ipv6'), 'fe80::1')
+      });
+    });
+  });
+
+  describe('isLoopback() method', function() {
+    describe('127.0.0.1', function() {
+      it('should respond with true', function() {
+        assert.ok(ip.isLoopback('127.0.0.1'))
+      });
+    });
+
+    describe('127.8.8.8', function () {
+      it('should respond with true', function () {
+        assert.ok(ip.isLoopback('127.8.8.8'))
+      });
+    });
+
+    describe('8.8.8.8', function () {
+      it('should respond with false', function () {
+        assert.equal(ip.isLoopback('8.8.8.8'), false);
+      });
+    });
+
+    describe('fe80::1', function() {
+      it('should respond with true', function() {
+        assert.ok(ip.isLoopback('fe80::1'))
+      });
+    });
+
+    describe('::1', function() {
+      it('should respond with true', function() {
+        assert.ok(ip.isLoopback('::1'))
+      });
+    });
+
+    describe('::', function() {
+      it('should respond with true', function() {
+        assert.ok(ip.isLoopback('::'))
+      });
+    });
+  });
+
+  describe('address() method', function() {
+    describe('undefined', function() {
+      it('should respond with a private ip', function() {
+        assert.ok(ip.isPrivate(ip.address()));
+      });
+    });
+
+    describe('private', function() {
+      [ undefined, 'ipv4', 'ipv6' ].forEach(function(family) {
+        describe(family, function() {
+          it('should respond with a private ip', function() {
+            assert.ok(ip.isPrivate(ip.address('private', family)));
+          });
+        });
+      });
+    });
+
+    var interfaces = os.networkInterfaces();
+
+    Object.keys(interfaces).forEach(function(nic) {
+      describe(nic, function() {
+        [ undefined, 'ipv4' ].forEach(function(family) {
+          describe(family, function() {
+            it('should respond with an ipv4 address', function() {
+              var addr = ip.address(nic, family);
+              assert.ok(!addr || net.isIPv4(addr));
+            });
+          });
+        });
+
+        describe('ipv6', function() {
+          it('should respond with an ipv6 address', function() {
+            var addr = ip.address(nic, 'ipv6');
+            assert.ok(!addr || net.isIPv6(addr));
+          });
+        })
+      });
+    });
+  });
+
+  describe('toLong() method', function() {
+    it('should respond with a int', function() {
+      assert.equal(ip.toLong('127.0.0.1'), 2130706433);
+      assert.equal(ip.toLong('255.255.255.255'), 4294967295);
+    });
+  });
+
+  describe('fromLong() method', function() {
+    it('should repond with ipv4 address', function() {
+      assert.equal(ip.fromLong(2130706433), '127.0.0.1');
+      assert.equal(ip.fromLong(4294967295), '255.255.255.255');
+    });
+  })
+});