diff --git a/test/core/common.js b/test/core/common.js
new file mode 100644
index 0000000..9bd9dfc
--- /dev/null
+++ b/test/core/common.js
@@ -0,0 +1,145 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var path = require('path');
+var assert = require('assert');
+
+exports.testDir = path.dirname(__filename);
+exports.fixturesDir = path.join(exports.testDir, 'fixtures');
+exports.libDir = path.join(exports.testDir, '../lib');
+exports.tmpDir = path.join(exports.testDir, 'tmp');
+exports.PORT = 12346;
+exports.PROXY_PORT = 1234567;
+
+if (process.platform == 'win32') {
+  exports.PIPE = '\\\\.\\pipe\\libuv-test';
+} else {
+  exports.PIPE = exports.tmpDir + '/test.sock';
+}
+
+var util = require('util');
+for (var i in util) exports[i] = util[i];
+//for (var i in exports) global[i] = exports[i];
+
+function protoCtrChain(o) {
+  var result = [];
+  for (; o; o = o.__proto__) { result.push(o.constructor); }
+  return result.join();
+}
+
+exports.indirectInstanceOf = function(obj, cls) {
+  if (obj instanceof cls) { return true; }
+  var clsChain = protoCtrChain(cls.prototype);
+  var objChain = protoCtrChain(obj);
+  return objChain.slice(-clsChain.length) === clsChain;
+};
+
+
+exports.ddCommand = function(filename, kilobytes) {
+  if (process.platform == 'win32') {
+    return '"' + process.argv[0] + '" "' + path.resolve(exports.fixturesDir,
+      'create-file.js') + '" "' + filename + '" ' + (kilobytes * 1024);
+  } else {
+    return 'dd if=/dev/zero of="' + filename + '" bs=1024 count=' + kilobytes;
+  }
+};
+
+
+exports.spawnPwd = function(options) {
+  var spawn = require('child_process').spawn;
+
+  if (process.platform == 'win32') {
+    return spawn('cmd.exe', ['/c', 'cd'], options);
+  } else {
+    return spawn('pwd', [], options);
+  }
+};
+
+
+// Turn this off if the test should not check for global leaks.
+exports.globalCheck = true;
+
+process.on('exit', function() {
+  if (!exports.globalCheck) return;
+  var knownGlobals = [setTimeout,
+                      setInterval,
+                      clearTimeout,
+                      clearInterval,
+                      console,
+                      Buffer,
+                      process,
+                      global];
+
+  if (global.errno) {
+    knownGlobals.push(errno);
+  }
+
+  if (global.gc) {
+    knownGlobals.push(gc);
+  }
+
+  if (global.DTRACE_HTTP_SERVER_RESPONSE) {
+    knownGlobals.push(DTRACE_HTTP_SERVER_RESPONSE);
+    knownGlobals.push(DTRACE_HTTP_SERVER_REQUEST);
+    knownGlobals.push(DTRACE_HTTP_CLIENT_RESPONSE);
+    knownGlobals.push(DTRACE_HTTP_CLIENT_REQUEST);
+    knownGlobals.push(DTRACE_NET_STREAM_END);
+    knownGlobals.push(DTRACE_NET_SERVER_CONNECTION);
+    knownGlobals.push(DTRACE_NET_SOCKET_READ);
+    knownGlobals.push(DTRACE_NET_SOCKET_WRITE);
+  }
+
+  if (global.ArrayBuffer) {
+    knownGlobals.push(ArrayBuffer);
+    knownGlobals.push(Int8Array);
+    knownGlobals.push(Uint8Array);
+    knownGlobals.push(Int16Array);
+    knownGlobals.push(Uint16Array);
+    knownGlobals.push(Int32Array);
+    knownGlobals.push(Uint32Array);
+    knownGlobals.push(Float32Array);
+    knownGlobals.push(Float64Array);
+    knownGlobals.push(DataView);
+  }
+
+  for (var x in global) {
+    var found = false;
+
+    for (var y in knownGlobals) {
+      if (global[x] === knownGlobals[y]) {
+        found = true;
+        break;
+      }
+    }
+
+    if (!found) {
+      console.error('Unknown global: %s', x);
+      assert.ok(false, 'Unknown global found');
+    }
+  }
+});
+
+
+// This function allows one two run an HTTP test agaist both HTTPS and
+// normal HTTP modules. This ensures they fit the same API.
+exports.httpTest = function httpTest(cb) {
+};
+