code: def test_tz_dtype_mismatch_raises(self):
      arr = DatetimeArray._from_sequence(
          ["2000"], dtype=DatetimeTZDtype(tz="US/Central")
      )
      with pytest.raises(TypeError, match="data is already tz-aware"):
          DatetimeArray._from_sequence(
              arr, dtype=DatetimeTZDtype(tz="UTC")
          )
  
imports: import numpy
  import pytest
  from pandas._libs import iNaT
  from pandas.core.dtypes.dtypes import DatetimeTZDtype
  import pandas
  import pandas._testing
  from pandas.core.arrays import DatetimeArray
label_desc: Use image node_id 1 for calling the TestSequenceToDT64NS obj's underlying member method code with example usage: obj.test_tz_dtype_mismatch_raises() without return types