Get all Iris tests working again (5 man days' effort)

[corinnebosley]

(refactor or replace implementation-specific tests)

[lbdreyer]

Relevant Issue: #2443

[lbdreyer]

Remove all skip_biggus skippers:
ldreyer@eld347 $ grep -ilr --color "@tests.skip_biggus"

Done

• tests/unit/cube/test_Cube__operators.py (being dealt with in Remove all biggus imports from Iris codebase #2443)
• tests/unit/concatenate/test_concatenate.py (being dealt with in Remove all biggus imports from Iris codebase #2443)
• tests/test_analysis_calculus.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/integration/test_aggregated_cube.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/integration/test_regridding.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/integration/experimental/test_regrid_ProjectedUnstructured.py Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/unit/analysis/maths/test_add.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/unit/analysis/maths/test_multiply.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/unit/analysis/maths/test_subtract.py @lbdreyer Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/unit/fileformats/pyke_rules/compiled_krb/fc_rules_cf_fc/test_build_auxiliary_coordinate.py Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/unit/experimental/regrid/test__CurvilinearRegridder.py Remove some @tests.skip_biggus that are now unnecessary #2450
• tests/test_cdm.py Remove biggus test skipper: fix pp field data #2473
• tests/unit/fileformats/test_rules.py Remove skip_biggus from unit/fileformats/test_rules.py #2459
• lib/iris/tests/unit/fileformats/pp/test_PPField.py:70 Remove a few more biggus skippers #2552
• lib/iris/tests/unit/fileformats/grib/test_load_cubes.py:55 Remove a few more biggus skippers #2552
• lib/iris/tests/test_pp_module.py:210 test_wgdos Remove a few more biggus skippers #2552
• lib/iris/tests/test_abf.py:31 Remove a few more biggus skippers #2552
  possibly a strange thing going on with the fill value due to #2524 comment
• lib/iris/tests/unit/fileformats/test_rules.py:108 Remove skip_biggus from unit/fileformats/test_rules.py #2459
  lib/iris/tests/unit/fileformats/test_rules.py:159
  Tests needs updating to work with new api: 'AttributeError: 'Mock' object has no attribute 'core_data''
• lib/iris/tests/test_pickling.py:53 Fix pickle test #2555
  After pickling then unpickling, it checks to make sure the data is still lazy but it isn't
• lib/iris/tests/unit/fileformats/netcdf/test__load_cube.py:36 Fix a few more tests #2556
  lib/iris/tests/unit/fileformats/netcdf/test__load_cube.py:190
  problem with chunks: 'ValueError: Chunks do not add up to shape.'
• lib/iris/tests/unit/fileformats/rules/test__make_cube.py:32 Fix rules test for _make_cube #2557
  Seg fault
• lib/iris/tests/test_cube_to_pp.py:236 Fix PP bmdi handling #2564
  lib/iris/tests/test_cube_to_pp.py:270
  pp/bmdi problem
• lib/iris/tests/test_pp_cf.py:84 Fix PP bmdi handling #2564
  pp/bmdi problem
• lib/iris/tests/test_pp_module.py:245 test_rle Fix PP bmdi handling #2564
  Test loads in pp file and checks the data/mask which is different to the expected
• lib/iris/tests/integration/test_pp.py:51 Fix PP bmdi handling #2564
  lib/iris/tests/integration/test_pp.py:86
lib/iris/tests/integration/test_pp.py:122
  Seg fault

Tick a box above if you are working on it, once a PR is up add the link. Once the PR is merged add a strikethrough

[pp-mo]

In context of #2507, I'm grabbing these ones (so, ticked them above) :
lib/iris/tests/test_cube_to_pp.py:236
lib/iris/tests/test_cube_to_pp.py:270
lib/iris/tests/test_pp_cf.py:84
==> "pp/bmdi problem"

lib/iris/tests/test_pp_module.py:245 test_rle
==> "Test loads in pp file and checks the data/mask which is different to the expected"

lib/iris/tests/integration/test_pp.py:51
lib/iris/tests/integration/test_pp.py:86
lib/iris/tests/integration/test_pp.py:122
==> Seg fault

[pp-mo]

🍾 🍰