Allow deprecated regridding scheme unstructured_nearest in recipe c…

…hecks (#2336)

esmvalcore/_recipe/check.py

@@ -511,10 +511,10 @@ def regridding_schemes(settings: dict):
  if isinstance(scheme, str):
  scheme = settings['regrid']['scheme']
 
- # Also allow deprecated 'linear_extrapolate' scheme (the corresponding
- # deprecation warning will be raised in the regrid() preprocessor)
- # TODO: Remove in v2.13.0
- if scheme == 'linear_extrapolate':
+ # Also allow deprecated 'linear_extrapolate' and 'unstructured_nearest'
+ # schemes (the corresponding deprecation warnings will be raised in the
+ # regrid() preprocessor) TODO: Remove in v2.13.0
+ if scheme in ('linear_extrapolate', 'unstructured_nearest'):
  return
 
  allowed_regridding_schemes = list(

tests/integration/recipe/test_recipe.py

@@ -3094,7 +3094,9 @@ def test_invalid_generic_regridding_scheme(
  assert msg in str(rec_err_exp.value.failed_tasks[0].message)
 
 
-def test_deprecated_regridding_scheme(tmp_path, patched_datafinder, session):
+def test_deprecated_linear_extrapolate_scheme(
+ tmp_path, patched_datafinder, session
+):
  content = dedent("""
  preprocessors:
  test:
@@ -3114,3 +3116,27 @@ def test_deprecated_regridding_scheme(tmp_path, patched_datafinder, session):
  scripts: null
  """)
  get_recipe(tmp_path, content, session)
+
+
+def test_deprecated_unstructured_nearest_scheme(
+ tmp_path, patched_datafinder, session
+):
+ content = dedent("""
+ preprocessors:
+ test:
+ regrid:
+ scheme: unstructured_nearest
+ target_grid: 2x2
+ diagnostics:
+ diagnostic_name:
+ variables:
+ tas:
+ mip: Amon
+ preprocessor: test
+ timerange: '2000/2010'
+ additional_datasets:
+ - {project: CMIP5, dataset: CanESM2, exp: amip,
+ ensemble: r1i1p1}
+ scripts: null
+ """)
+ get_recipe(tmp_path, content, session)