code: def test_numpy_datetime_unit(self, unit):
      data = np.array([1, 2, 3], dtype=f"M8[{unit}]")
      arr = DatetimeArray._from_sequence(data)
      assert arr.unit == unit
      assert arr[0].unit == unit
  
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 13 for calling the TestDatetimeArrayConstructor obj's underlying member method code with example usage: obj.test_numpy_datetime_unit(unit) without return types