old_contents: # -*- coding: utf-8 -*-
  
  import warnings
  
  from .settings import *  # noqa: F403,F401
  
  # Handle system warning as log messages
  warnings.simplefilter("once")
  
  for handler in LOGGING.get("handlers", []):
      LOGGING["handlers"][handler]["level"] = "CRITICAL"
  for logger in LOGGING.get("loggers", []):
      LOGGING["loggers"][logger]["level"] = "CRITICAL"
  
  mysql_db = DATABASES["default"]
  DEFAULT_DB = {
      "ENGINE": "django.db.backends.sqlite3",
      "NAME": ":memory:",
      "TEST": {"MIGRATE": False},
  }
  if os.environ.get("DB_TYPE") == "mysql":
      print("Using MySQL Backend!")
      DEFAULT_DB = mysql_db
  
  DATABASES = {
      "default": DEFAULT_DB,
  }
new_contents: # -*- coding: utf-8 -*-
  
  import warnings
  
  from .settings import *  # noqa: F403,F401
  
  # Handle system warning as log messages
  warnings.simplefilter("once")
  
  for handler in LOGGING.get("handlers", []):
      LOGGING["handlers"][handler]["level"] = "CRITICAL"
  for logger in LOGGING.get("loggers", []):
      LOGGING["loggers"][logger]["level"] = "CRITICAL"
  
  mysql_db = DATABASES["default"]
  DEFAULT_DB = {
      "ENGINE": "django.db.backends.sqlite3",
      "NAME": ":memory:",
      "TEST": {"MIGRATE": False},
  }
  if os.environ.get("DB_TYPE") == "mysql":
      print("Using MySQL Backend!")
      DEFAULT_DB = mysql_db
  
  DATABASES = {
      "default": DEFAULT_DB,
  }
  
subject: Unify and simplify for tests.