Refactored backend (Fixes #87)

tests/Tbackend/db_test.py

@@ -0,0 +1,26 @@
+import unittest
+from os.path import join
+
+from flask import Flask
+
+from backend.base.helpers import folder_path
+from backend.internals.db import Constants, DBConnection, close_db
+
+
+class Test_DB(unittest.TestCase):
+    def test_foreign_key_and_wal(self):
+        app = Flask(__name__)
+        app.teardown_appcontext(close_db)
+
+        DBConnection.file = join(
+            folder_path(*Constants.DB_FOLDER),
+            Constants.DB_NAME
+        )
+        with app.app_context():
+            instance = DBConnection(timeout=Constants.DB_TIMEOUT)
+            self.assertEqual(
+                instance.cursor().execute(
+                    "PRAGMA foreign_keys;"
+                ).fetchone()[0],
+                1
+            )