old_contents: from django.conf import settings
  
  from corehq.apps.domain.dbaccessors import get_docs_in_domain_by_class
  from corehq.apps.domain.models import Domain
  from corehq.apps.performance_sms.models import PerformanceConfiguration
  
  
  def by_domain(domain):
      return list(get_docs_in_domain_by_class(domain, PerformanceConfiguration))
  
  
  def by_interval(interval_keys):
      return list(PerformanceConfiguration.view(
          'performance_sms/by_schedule',
          key=interval_keys,
          reduce=False,
          include_docs=True,
      ))
  
  
  def delete_all_configs():
      assert settings.UNIT_TESTING
      db = PerformanceConfiguration.get_db()
  
      # Since this is a unit test, number of domains is small
      all_domains = Domain.get_all()
      for domain in all_domains:
          domain_configs = by_domain(domain)
          db.bulk_delete(domain_configs)
  
new_contents: from django.conf import settings
  
  from corehq.apps.domain.dbaccessors import get_docs_in_domain_by_class
  from corehq.apps.domain.models import Domain
  from corehq.apps.performance_sms.models import PerformanceConfiguration
  from corehq.util.test_utils import unit_testing_only
  
  
  def by_domain(domain):
      return list(get_docs_in_domain_by_class(domain, PerformanceConfiguration))
  
  
  def by_interval(interval_keys):
      return list(PerformanceConfiguration.view(
          'performance_sms/by_schedule',
          key=interval_keys,
          reduce=False,
          include_docs=True,
      ))
  
  
  @unit_testing_only
  def delete_all_configs():
      db = PerformanceConfiguration.get_db()
  
      # Since this is a unit test, number of domains is small
      all_domains = Domain.get_all()
      for domain in all_domains:
          domain_configs = by_domain(domain)
          db.bulk_delete(domain_configs)
  
subject: add unit_testing_only decorator