message: Add simplex tree test for persistence_intervals_in_dimension
diff: """
  from gudhi import SimplexTree, __GUDHI_USE_EIGEN3
  +import numpy as np
  import pytest
  __author__ = "Vincent Rouvreau"
  @@ -404,3 +405,46 @@ def test_boundaries_iterator():
  with pytest.raises(RuntimeError):
  list(st.get_boundaries([6])) # (6) does not exist
  +
  +def test_persistence_intervals_in_dimension():
  + # Here is our triangulation of a 2-torus - taken from https://dioscuri-tda.org/Paris_TDA_Tutorial_2021.html
  + # 0-----3-----4-----0
  + # | \ | \ | \ | \ |
  + # | \ | \ | \| \ |
  + # 1-----8-----7-----1
  + # | \ | \ | \ | \ |
  + # | \ | \ | \ | \ |
  + # 2-----5-----6-----2
  + # | \ | \ | \ | \ |
  + # | \ | \ | \ | \ |
  + # 0-----3-----4-----0
  + st = SimplexTree()
  + st.insert([0,1,8])
  + st.insert([0,3,8])
  + st.insert([3,7,8])
  + st.insert([3,4,7])
  + st.insert([1,4,7])
  + st.insert([0,1,4])
  + st.insert([1,2,5])
  + st.insert([1,5,8])
  + st.insert([5,6,8])
  + st.insert([6,7,8])
  + st.insert([2,6,7])
  + st.insert([1,2,7])
  + st.insert([0,2,3])
  + st.insert([2,3,5])
  + st.insert([3,4,5])
  + st.insert([4,5,6])
  + st.insert([0,4,6])
  + st.insert([0,2,6])
  + st.compute_persistence(persistence_dim_max=True)
  +
  + H0 = st.persistence_intervals_in_dimension(0)
  + assert np.array_equal(H0, np.array([[ 0., float("inf")]]))
  + H1 = st.persistence_intervals_in_dimension(1)
  + assert np.array_equal(H1, np.array([[ 0., float("inf")], [ 0., float("inf")]]))
  + H2 = st.persistence_intervals_in_dimension(2)
  + assert np.array_equal(H2, np.array([[ 0., float("inf")]]))
  + # Test empty case
  + assert st.persistence_intervals_in_dimension(3).shape == (0, 2)
  +
  \ No newline at end of file
  