class_docstr: Tests specific to IntervalIndex with float subtype
class_docstr_tok: ["Tests","specific","to","IntervalIndex","with","float","subtype"]
code: def test_subtype_integer(self, subtype):
      index = interval_range(0.0, 10.0)
      dtype = IntervalDtype(subtype, "right")
      result = index.astype(dtype)
      expected = IntervalIndex.from_arrays(
          index.left.astype(subtype),
          index.right.astype(subtype),
          closed=index.closed,
      )
      tm.assert_index_equal(result, expected)
  
      # raises with NA
      msg = r"Cannot convert non-finite values \(NA or inf\) to integer"
      with pytest.raises(ValueError, match=msg):
          index.insert(0, np.nan).astype(dtype)
  
imports: import re
  import numpy
  import pytest
  from pandas.core.dtypes.dtypes import CategoricalDtype, IntervalDtype
  from pandas import CategoricalIndex, Index, IntervalIndex, NaT, Timedelta, Timestamp, interval_range
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestFloatSubtype obj's underlying member method code with example usage: obj.test_subtype_integer(subtype) without return types