closeableContext.close(); // Third call
        });
    }

    @Test
    @DisplayName("Should maintain key isolation between instances")
    void testKeyIsolationBetweenInstances() {
        // Given
        byte[] key1 = new byte[16];
        byte[] key2 = new byte[16];
        new SecureRandom().nextBytes(key1);
        new SecureRandom().nextBytes(key2);