text: """
      Unit tests for matplotlib drawing functions.
  """
  
  import os
  
  from nose import SkipTest
  
  import networkx as nx
  
  class TestPylab(object):
      @classmethod
      def setupClass(cls):
          global pylab
          try:
              import matplotlib as mpl
              mpl.use('PS',warn=False)
              import pylab
          except ImportError:
              raise SkipTest('matplotlib not available.')
          except RuntimeError:
              raise SkipTest('matplotlib not available.')
  
      def setUp(self):
          self.G=nx.barbell_graph(5,10)
  
  
      def test_draw(self):
  #         hold(False)
          N=self.G
          nx.draw_spring(N)
          pylab.savefig("test.ps")
          nx.draw_random(N)
          pylab.savefig("test.ps")
          nx.draw_circular(N)
          pylab.savefig("test.ps")
          nx.draw_spectral(N)
          pylab.savefig("test.ps")
          os.unlink('test.ps')
  