Merge branch 'inigo/refactor-code-coverage' into 'staging'

apps/accounts/migrations/0008_auto_20210404_2332.py

apps/accounts/models.py

apps/accounts/tests/factories/accounts.py

apps/accounts/tests/test_units/test_accounts.py

apps/accounts/tests/test_units/test_models.py

apps/accounts/tests/test_units/test_serializers.py

apps/cases/constants.py

apps/cases/migrations/0013_auto_20210404_2046.py

apps/cases/models.py

apps/cases/serializers.py

apps/cases/tests/factories/case_subjects.py

apps/cases/tests/test_units/test_models.py

apps/cases/tests/test_units/test_serializers.py

apps/exportables/tests/test_units/data.py

apps/exportables/tests/test_units/test_exportables.py

apps/exportables/utils.py