[tests] speedup the tests a bit by using a in memory database

tests/testapp/settings.py

@@ -76,11 +76,15 @@ WSGI_APPLICATION = 'testapp.wsgi.application'
 # Database
 # https://docs.djangoproject.com/en/2.2/ref/settings/#databases
 
+if 'test' in sys.argv:
+    DB_NAME = ':memory:'
+else:
+    DB_NAME = os.path.join(BASE_DIR, 'db.sqlite3')
+
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',
-        # 'NAME': ':memory:',
-        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+        'NAME': DB_NAME,
     }
 }