Add backup interval setting and throttled backups

src/tests/test_backup_interval.py

@@ -0,0 +1,34 @@
+import time
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from helpers import create_vault, TEST_SEED, TEST_PASSWORD
+
+from password_manager.backup import BackupManager
+from password_manager.config_manager import ConfigManager
+
+
+def test_backup_interval(monkeypatch):
+    with TemporaryDirectory() as tmpdir:
+        fp_dir = Path(tmpdir)
+        vault, _ = create_vault(fp_dir, TEST_SEED, TEST_PASSWORD)
+        cfg_mgr = ConfigManager(vault, fp_dir)
+        cfg_mgr.set_backup_interval(10)
+        backup_mgr = BackupManager(fp_dir, cfg_mgr)
+
+        vault.save_index({"entries": {}})
+
+        monkeypatch.setattr(time, "time", lambda: 1000)
+        backup_mgr.create_backup()
+        first = fp_dir / "backups" / "entries_db_backup_1000.json.enc"
+        assert first.exists()
+
+        monkeypatch.setattr(time, "time", lambda: 1005)
+        backup_mgr.create_backup()
+        second = fp_dir / "backups" / "entries_db_backup_1005.json.enc"
+        assert not second.exists()
+
+        monkeypatch.setattr(time, "time", lambda: 1012)
+        backup_mgr.create_backup()
+        third = fp_dir / "backups" / "entries_db_backup_1012.json.enc"
+        assert third.exists()