diff --git a/src/tests/test_memory_protection.py b/src/tests/test_memory_protection.py
new file mode 100644
index 0000000..30fe278
--- /dev/null
+++ b/src/tests/test_memory_protection.py
@@ -0,0 +1,29 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+import pytest
+
+from utils.memory_protection import InMemorySecret
+
+
+def test_inmemory_secret_round_trip_bytes_and_str():
+    plaintext = b"super secret"
+    secret = InMemorySecret(plaintext)
+    assert secret.get_bytes() == plaintext
+    assert secret.get_str() == plaintext.decode("utf-8")
+
+
+def test_inmemory_secret_invalid_type():
+    with pytest.raises(TypeError):
+        InMemorySecret("not bytes")
+
+
+def test_inmemory_secret_wipe_clears_attributes():
+    secret = InMemorySecret(b"wipe me")
+    secret.wipe()
+    assert secret._key is None
+    assert secret._nonce is None
+    assert secret._cipher is None
+    assert secret._encrypted is None