Return error message from validate_seed

src/tests/test_encryption_validate_seed.py

@@ -0,0 +1,30 @@
+import sys
+from pathlib import Path
+
+import pytest
+from cryptography.fernet import Fernet
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from seedpass.core.encryption import EncryptionManager
+
+
+def make_manager(tmp_path):
+    key = Fernet.generate_key()
+    return EncryptionManager(key, tmp_path)
+
+
+def test_validate_seed_valid_mnemonic(tmp_path):
+    manager = make_manager(tmp_path)
+    valid = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
+    is_valid, error = manager.validate_seed(valid)
+    assert is_valid is True
+    assert error is None
+
+
+def test_validate_seed_invalid_mnemonic(tmp_path):
+    manager = make_manager(tmp_path)
+    invalid = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon"
+    is_valid, error = manager.validate_seed(invalid)
+    assert is_valid is False
+    assert error == "Invalid seed phrase."