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diff --git a/src/python/src/_adapter/_test_links.py b/src/python/src/_adapter/_test_links.py
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+++ b/src/python/src/_adapter/_test_links.py
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+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Links suitable for use in tests."""
+
+import threading
+
+from _framework.base.packets import interfaces
+
+
+class ForeLink(interfaces.ForeLink):
+  """A ForeLink suitable for use in tests of RearLinks."""
+
+  def __init__(self, action, rear_link):
+    self.condition = threading.Condition()
+    self.tickets = []
+    self.action = action
+    self.rear_link = rear_link
+
+  def accept_back_to_front_ticket(self, ticket):
+    with self.condition:
+      self.tickets.append(ticket)
+      self.condition.notify_all()
+      action, rear_link = self.action, self.rear_link
+
+    if action is not None:
+      action(ticket, rear_link)
+
+  def join_rear_link(self, rear_link):
+    with self.condition:
+      self.rear_link = rear_link
+
+
+class RearLink(interfaces.RearLink):
+  """A RearLink suitable for use in tests of ForeLinks."""
+
+  def __init__(self, action, fore_link):
+    self.condition = threading.Condition()
+    self.tickets = []
+    self.action = action
+    self.fore_link = fore_link
+
+  def accept_front_to_back_ticket(self, ticket):
+    with self.condition:
+      self.tickets.append(ticket)
+      self.condition.notify_all()
+      action, fore_link = self.action, self.fore_link
+
+    if action is not None:
+      action(ticket, fore_link)
+
+  def join_fore_link(self, fore_link):
+    with self.condition:
+      self.fore_link = fore_link