skip several tests related to scipy, chgnet, and phonopy

tests/analysis/test_piezo_sensitivity.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import pickle
+import sys
 
 import numpy as np
 import pytest
@@ -257,6 +258,7 @@ def test_get_piezo(self):
         piezo = get_piezo(self.BEC, self.IST, self.FCM)
         assert_allclose(piezo, self.piezo, atol=1e-5)
 
+    @pytest.mark.skipif(sys.platform == "win32" and int(np.__version__[0]) >= 2, reason="See https://github.com/conda-forge/phonopy-feedstock/pull/158#issuecomment-2227506701")
     def test_rand_piezo(self):
         pytest.importorskip("phonopy")
         rand_BEC, rand_IST, rand_FCM, _piezo = rand_piezo(

tests/core/test_structure.py

@@ -1680,6 +1680,7 @@ def test_calculate_ase(self):
         assert not hasattr(calculator, "dynamics")
         assert self.cu_structure == struct_copy, "original structure was modified"
 
+    @pytest.mark.skipif(int(np.__version__[0]) >= 2, reason="chgnet is not built against NumPy 2.0")
     def test_relax_chgnet(self):
         pytest.importorskip("chgnet")
         struct_copy = self.cu_structure.copy()
@@ -1703,6 +1704,7 @@ def test_relax_chgnet(self):
         assert custom_relaxed.calc.results.get("energy") == approx(-6.0151076, abs=1e-4)
         assert custom_relaxed.volume == approx(40.044794644, abs=1e-4)
 
+    @pytest.mark.skipif(int(np.__version__[0]) >= 2, reason="chgnet is not built against NumPy 2.0")
     def test_calculate_chgnet(self):
         pytest.importorskip("chgnet")
         struct = self.get_structure("Si")

tests/io/test_phonopy.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import sys
 from pathlib import Path
 from unittest import TestCase
 
@@ -167,6 +168,7 @@ def setUp(self) -> None:
         self.supercell_matrix = np.eye(3) * 2
         self.force_constants = parse_FORCE_CONSTANTS(fc_file)
 
+    @pytest.mark.skipif(sys.platform == "win32" and int(np.__version__[0]) >= 2, reason="See https://github.com/conda-forge/phonopy-feedstock/pull/158#issuecomment-2227506701")
     def test_get_phonon_dos_from_fc(self):
         dos = get_phonon_dos_from_fc(
             self.structure,

tests/io/vasp/test_optics.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import sys
+
 import numpy as np
 import pytest
 import scipy.special
@@ -51,6 +53,7 @@ def test_optics(self):
         assert len(x_val) == len(y_val) == len(text)
 
 
+@pytest.mark.skipif(sys.platform == "win32" and int(np.__version__[0]) >= 2, reason="Fails on Windows with numpy > 2.0.0, awaiting https://github.com/scipy/scipy/issues/21052 resolution")
 def test_delta_func():
     x = np.array([0, 1, 2, 3, 4, 5])