assertNotNull(newKey, "New key should exist");
        assertFalse(Arrays.equals(testKey, newKey), "New key should be different from old key");
    }

    @Test
    public void testMultipleKeyRotations() throws GeneralSecurityException {
        String sessionId = "multi-rotation";
        keyManager.storeSessionKey(sessionId, testKey, "AES");

        // Perform multiple rotations