test: derive keys for vault setup

src/tests/helpers.py

@@ -0,0 +1,32 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from password_manager.vault import Vault
+from password_manager.encryption import EncryptionManager
+from utils.key_derivation import (
+    derive_index_key,
+    derive_key_from_password,
+    EncryptionMode,
+)
+
+TEST_SEED = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
+TEST_PASSWORD = "pw"
+
+
+def create_vault(
+    dir_path: Path,
+    seed: str = TEST_SEED,
+    password: str = TEST_PASSWORD,
+    mode: EncryptionMode = EncryptionMode.SEED_ONLY,
+) -> tuple[Vault, EncryptionManager]:
+    """Create a Vault initialized for tests."""
+    seed_key = derive_key_from_password(password)
+    seed_mgr = EncryptionManager(seed_key, dir_path)
+    seed_mgr.encrypt_parent_seed(seed)
+
+    index_key = derive_index_key(seed, password, mode)
+    enc_mgr = EncryptionManager(index_key, dir_path)
+    vault = Vault(enc_mgr, dir_path)
+    return vault, enc_mgr