class_docstr: Common tests for all variations of IntervalIndex construction. Input data
  to be supplied in breaks format, then converted by the subclass method
  get_kwargs_from_breaks to the expected format.
code: def test_constructor_empty(self, constructor, breaks, closed):
      # GH 18421
      result_kwargs = self.get_kwargs_from_breaks(breaks)
      result = constructor(closed=closed, **result_kwargs)
  
      expected_values = np.array([], dtype=object)
      expected_subtype = getattr(breaks, "dtype", np.int64)
  
      assert result.empty
      assert result.closed == closed
      assert result.dtype.subtype == expected_subtype
      tm.assert_numpy_array_equal(np.array(result), expected_values)
  
imports: from functools import partial
  import numpy
  import pytest
  import pandas.util._test_decorators
  from pandas.core.dtypes.common import is_unsigned_integer_dtype
  from pandas.core.dtypes.dtypes import IntervalDtype
  from pandas import Categorical, CategoricalDtype, CategoricalIndex, Index, Interval, IntervalIndex, date_range, notna, period_range, timedelta_range
  import pandas._testing
  from pandas.core.arrays import IntervalArray
  import pandas.core.common
label_desc: Use image node_id 5 for calling the ConstructorTests obj's underlying member method code with example usage: obj.test_constructor_empty(constructor, breaks, closed) without return types