old_contents: from nose.tools import assert_equal, assert_raises, assert_not_equal
  import networkx as nx
  import io
  import tempfile
  import os
  from networkx.readwrite.p2g import *
  from networkx.testing import *
  
  
  class TestP2G:
  
      def setUp(self):
          self.G=nx.Graph(name="test")
          e=[('a','b'),('b','c'),('c','d'),('d','e'),('e','f'),('a','f')]
          self.G.add_edges_from(e)
          self.G.add_node('g')
          self.DG=nx.DiGraph(self.G)
  
      def test_read_p2g(self):
          s = b"""\
  name
  3 4
  a
  1 2
  b
  
  c
  0 2
  """
          bytesIO = io.BytesIO(s)
          G = read_p2g(bytesIO)
  (G.edges(),H.edges())
  
new_contents: from nose.tools import assert_equal, assert_raises, assert_not_equal
  import networkx as nx
  import io
  import tempfile
  import os
  from networkx.readwrite.p2g import *
  from networkx.testing import *
  
  
  class TestP2G:
  
      def setUp(self):
          self.G=nx.Graph(name="test")
          e=[('a','b'),('b','c'),('c','d'),('d','e'),('e','f'),('a','f')]
          self.G.add_edges_from(e)
          self.G.add_node('g')
          self.DG=nx.DiGraph(self.G)
  
      def test_read_p2g(self):
          s = b"""\
  name
  3 4
  a
  1 2
  b
  
  c
  0 2
  """
          bytesIO = io.BytesIO(s)
          G = read_p2g(bytesIO)
          assert_equal(G.name,'name')
          assert_equal(sorted(G),['a','b','c'])
          edges = [(str(u),str(v)) for u,v in G.edges()]
          assert_edges_equal(G.edges(),[('a','c'),('a','b'),('c','a'),('c','c')])
  
      def test_write_p2g(self):
          s=b"""foo
  3 2
  1
  1 
  2
  2 
  3
  
  """
          fh=io.BytesIO()
          G=nx.DiGraph()
          G.name='foo'
          G.add_edges_from([(1,2),(2,3)])
          write_p2g(G,fh)
          fh.seek(0)
          r=fh.read()
          assert_equal(r,s)
  
      def test_write_read_p2g(self):
          fh=io.BytesIO()
          G=nx.DiGraph()
          G.name='foo'
          G.add_edges_from([('a','b'),('b','c')])
          write_p2g(G,fh)
          fh.seek(0)
          H=read_p2g(fh)
          assert_edges_equal(G.edges(),H.edges())
  
subject: put back p2g tests