content: from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from matplotlib.externals import six
  
  from nose.tools import assert_equal
  
  from matplotlib.testing.decorators import knownfailureif
  from pylab import *
  
  
  def test_simple():
      assert_equal(1 + 1, 2)
  
  
  @knownfailureif(True)
  def test_simple_knownfail():
      # Test the known fail mechanism.
      assert_equal(1 + 1, 3)
  
  
  def test_override_builtins():
      ok_to_override = set([
          '__name__',
          '__doc__',
          '__package__',
          '__loader__',
          '__spec__',
          'any',
          'all',
          'sum'
      ])
  
      # We could use six.moves.builtins here, but that seems
      # to do a little more than just this.
      if six.PY3:
          builtins = sys.modules['builtins']
      else:
          builtins = sys.modules['__builtin__']
  
      overridden = False
      for key in globals().keys():
          if key in dir(builtins):
              if (globals()[key] != getattr(builtins, key) and
                      key not in ok_to_override):
                  print("'%s' was overridden in globals()." % key)
                  overridden = True
  
      assert not overridden
  
  
  if __name__ == '__main__':
      import nose
      nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
  