code: def test_assign_columns(self, float_frame):
      float_frame["hi"] = "there"
  
      df = float_frame.copy()
      df.columns = ["foo", "bar", "baz", "quux", "foo2"]
      tm.assert_series_equal(
          float_frame["C"], df["baz"], check_names=False
      )
      tm.assert_series_equal(
          float_frame["hi"], df["foo2"], check_names=False
      )
  
imports: from datetime import datetime
  import pytz
  from pandas import DataFrame
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestDataFrameAlterAxes obj's underlying member method code with example usage: obj.test_assign_columns(float_frame) without return types