code: def test_constructor_int_dtype_nan_raises(self, dtype):
      # see GH#15187
      data = [np.nan]
      msg = "cannot convert"
      with pytest.raises(ValueError, match=msg):
          Index(data, dtype=dtype)
  
imports: from datetime import datetime, timedelta, timezone
  from decimal import Decimal
  import numpy
  import pytest
  from pandas._libs.tslibs.timezones import maybe_get_tz
  from pandas import NA, Categorical, CategoricalIndex, DatetimeIndex, Index, IntervalIndex, MultiIndex, NaT, PeriodIndex, Series, TimedeltaIndex, Timestamp, array, date_range, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 10 for calling the TestDtypeEnforced obj's underlying member method code with example usage: obj.test_constructor_int_dtype_nan_raises(dtype) without return types