fix tests

lib/iris/fileformats/_nc_load_rules/helpers.py

@@ -15,7 +15,6 @@
 """
 import re
 from typing import List
-import warnings
 
 import cf_units
 import numpy as np
@@ -438,7 +437,7 @@ def parse_cell_methods(nc_cell_methods, cf_name=None):
  cell_methods.append(cell_method)
  # only prints one warning, rather than each loop
  if msg:
- warnings.warn(msg, category=UnknownCellMethodWarning)
+ warn_once_at_level(msg, category=UnknownCellMethodWarning)
  return tuple(cell_methods)
 
 

lib/iris/fileformats/netcdf/loader.py

@@ -454,7 +454,7 @@ def coord_from_term(term):
  "Ignoring atmosphere hybrid sigma pressure "
  "scalar coordinate {!r} bounds.".format(coord_p0.name())
  )
- warnings.warn(
+ warn_once_at_level(
  msg,
  category=_WarnComboIgnoringBoundsLoad,
  )

lib/iris/fileformats/netcdf/saver.py

@@ -2829,7 +2829,7 @@ def attr_values_equal(val1, val2):
  # Catch any demoted attrs where there is already a local version
  blocked_attrs = demote_attrs & set(cube.attributes.locals)
  if blocked_attrs:
- warnings.warn(
+ warn_once_at_level(
  f"Global cube attributes {sorted(blocked_attrs)} "
  f'of cube "{cube.name()}" were not saved, overlaid '
  "by existing local attributes with the same names.",