'Check that default names are used when appropriate.'

def test_add_columns7(self, table_types):

    t = table_types.Table()
    col0 = table_types.Column([1, 2, 3])
    col1 = table_types.Column([4, 5, 3])
    t.add_columns([col0, col1])
    assert (t.colnames == ['col0', 'col1'])
