assertFalse(auth.isClosed());

        // Close multiple times
        auth.close();
        assertTrue(auth.isClosed());

        auth.close(); // Should not throw
        assertTrue(auth.isClosed());

        auth.close(); // Should still not throw
        assertTrue(auth.isClosed());
    }

    /**

        Socket s = mock(Socket.class);
        when(s.isClosed()).thenReturn(false);
        setField(transport, "socket", s);

        // Act & Assert
        assertFalse(transport.isDisconnected());
        assertFalse(transport.isFailed());

        // Close socket -> both should be true
        when(s.isClosed()).thenReturn(true);
        assertTrue(transport.isDisconnected());

                new Smb2EncryptionContext(EncryptionNegotiateContext.CIPHER_AES128_CCM, DialectVersion.SMB302, encKey, decKey, keyManager);

        assertFalse(context.isClosed());

        // When
        context.close();

        // Then
        assertTrue(context.isClosed());

        // Should be idempotent
        assertDoesNotThrow(() -> context.close());

        // Cleanup
        keyManager.close();
    }

            closed = true;
        }
    }

    /**
     * Check if this authenticator has been closed
     *
     * @return true if closed, false otherwise
     */
    public boolean isClosed() {
        return closed;
    }

    private void checkNotClosed() {
        if (closed) {
            throw new IllegalStateException("Authenticator has been closed");
        }
    }

    /**

        } finally {
            closed = true;
        }
    }

    /**
     * Check if this context is closed
     *
     * @return true if closed, false otherwise
     */
    public boolean isClosed() {
        return closed;
    }