text: #!/usr/bin/env python
  # 
  # Copyright (c) 2011, Willow Garage, 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 the Willow Garage, 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.
  # 
  import ecto
  import ecto.ecto_test as ecto_test
  
  def test_tendrils():
      t = ecto.Tendrils()
      t.declare("Hello","doc str",6)
      assert t.Hello == 6
      assert t["Hello"] == 6
      t.declare("x","a number", "str")
      assert len(t) == 2
      assert t["x"] == "str"
      assert t.x == "str"
      #test the redeclare
      try:
          t.declare("Hello","new doc", "you")
          util.fail()
      except ecto.TendrilRedeclaration, e:
          print str(e)
          assert('TendrilRedeclaration' in str(e))
      try:
          #read error
          t.nonexistant = 1
          util.fail()
      except ecto.NonExistant, e:
          print str(e)
          assert "tendril_key  nonexistant" in str(e)
      try:
          #index error
          print t["nonexistant"]
          util.fail()
      except ecto.NonExistant, e:
          print str(e)
          assert "tendril_key  nonexistant" in str(e)
  
      assert len(t.keys()) == 2
      assert len(t.values()) == 2
  
      print t
      #by value
      _x = t.x
      _x = 10
      assert t.x != 10
      x = t.x
      t.x = 11
      assert x != 11
      #by reference
      x = t.at("x")
      t.x = 13
      assert x.val == 13
  
      t.x = 17
      assert t.x == 17
      t.x = 199
      t.x = 15
      print t.x
      assert t.x == 15
  
  if __name__ == '__main__':
      test_tendrils()
  
  