def test_if_browser():

       tmp = py.test.ensuretemp("sourcebrowser")

       tmp.ensure("b.py").write(py.code.Source("""

           if 1:

               def f():

                   pass

           if 0:

               def g():

                   pass

->     """))

       mod = parse_path(tmp.join("b.py"))

       assert isinstance(mod.f, Function)

       py.test.raises(AttributeError, 'mod.g')

   def write(self, content, mode='wb'):

       """ write string content into path. """

       s = str(content)

->     f = self.open(mode)

       try:

           f.write(s)

       finally:

           f.close()