'Check remove_columns works for a single column with a name of
more than one character.  Regression test against #2699'

def test_3(self, table_types):

    self._setup(table_types)
    self.t['new_column'] = self.t['a']
    assert ('new_column' in self.t.columns.keys())
    self.t.remove_columns('new_column')
    assert ('new_column' not in self.t.columns.keys())
