[REFACTOR] change default databases to sqlite3 when running test

using sys.argv to check if doing test or not and change databases to default

pplbackend/settings.py

@@ -11,6 +11,7 @@ https://docs.djangoproject.com/en/3.0/ref/settings/
 """
 
 import os
+import sys
 
 from datetime import timedelta
 from dotenv import load_dotenv
@@ -94,11 +95,13 @@ WSGI_APPLICATION = 'pplbackend.wsgi.application'
 # Database
 # https://docs.djangoproject.com/en/3.0/ref/settings/#databases
 
+DEFAULT_DATABASE = {
+    'ENGINE': 'django.db.backends.sqlite3',
+    'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+}
+
 DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
-    }
+    'default': DEFAULT_DATABASE
 }
 
 # custom database host, overriding the default
@@ -112,6 +115,10 @@ if os.getenv('DB_HOST') is not None:
         'PORT': os.getenv('DB_PORT'),
     }
 
+# use default database when running test
+if 'test' in sys.argv:
+    DATABASES['default'] = DEFAULT_DATABASE
+
 # Password validation
 # https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators