code: def test_contains_float64_not_nans(self):
      index = Index([1.0, 2.0, np.nan], dtype=np.float64)
      assert 1.0 in index
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, Index, RangeIndex, Series, Timestamp
  import pandas._testing
  from pandas.core.arrays import ArrowExtensionArray, FloatingArray
label_desc: Use image node_id 3 for calling the TestContains obj's underlying member method code with example usage: obj.test_contains_float64_not_nans() without return types