Slow tests are failing for older numpy

[Zeitsperre]

Setup Information

• Xclim version: v0.51.1-dev
• Python version: Any
• Operating System: macOS (confirmed), possibly others

Description

Discovered in #1859

It appears that the changes to adapt to the newer numpy version have altered the expected outputs for some of the slow tests. This should be addressed/verified before the next xclim release.

Steps To Reproduce

$ tox -e py3{minor version}-numpy  # older numpy installed and slow tests run

Additional context

Stack Trace: https://github.com/Ouranosinc/xclim/actions/runs/10200661429/job/28220778506

Relevant failures:

  =========================== short test summary info ============================
  FAILED tests/test_indices.py::TestStandardizedIndices::test_standardized_precipitation_index[D-12-gamma-ML-values9-0.02] - AssertionError: 
  Not equal to tolerance rtol=0, atol=0.02
  
  Mismatched elements: 1 / 5 (20%)
  Max absolute difference: 0.12307347
  Max relative difference: 0.12816855
   x: array([-0.158116, -0.049222,  0.672544,  1.08332 ,  0.660903])
   y: array([-0.158854, -0.049165,  0.675863,  0.960247,  0.660831])
  FAILED tests/test_indices.py::TestStandardizedIndices::test_standardized_precipitation_index[D-1-fisk-ML-values10-0.02] - AssertionError: 
  Not equal to tolerance rtol=0, atol=0.02
  
  Mismatched elements: 3 / 5 (60%)
  Max absolute difference: 0.08092193
  Max relative difference: 0.34020486
   x: array([-0.158949,  1.308225,  0.449846,  0.146699, -0.502737])
   y: array([-0.194235,  1.308198,  0.530768,  0.22234 , -0.502635])
  FAILED tests/test_indices.py::TestStandardizedIndices::test_standardized_precipitation_index[D-1-gamma-ML-values8-0.02] - AssertionError: 
  Not equal to tolerance rtol=0, atol=0.02
  
  Mismatched elements: 4 / 5 (80%)
  Max absolute difference: 0.31702955
  Max relative difference: 0.86038048
   x: array([-0.011698,  1.597031,  0.969884,  0.265561, -0.132654])
   y: array([-0.083785,  1.457647,  0.993296,  0.271894, -0.449684])
  = 3 failed, 1564 passed, 73 skipped, 3 xfailed, 8 warnings in 161.20s (0:02:41) =

Contribution

• I would be willing/able to open a Pull Request to address this bug.

Code of Conduct

• I agree to follow this project's Code of Conduct

[aulemahal]

These tests were explicitly modified by @coxipi to adapt for numpy 2 in #1814. IIUC, I suggest we simply skip them on older numpy.

[coxipi]

Sorry about that inconvenience

[Zeitsperre]

Closed via #1862