}

    @Test
    public void testNullBuffer() throws Exception {
        assertThrows(SmbException.class, () -> {
            validator.validateBuffer(null, 100, 1024);
        });
    }

    @Test
    public void testBufferTooSmall() throws Exception {
        byte[] buffer = new byte[50];
        assertThrows(SmbException.class, () -> {
            validator.validateBuffer(buffer, 100, 1024);
        });

        assertThrows(CIFSException.class, () -> sidResolver.resolveSids(mockContext, null, testSids));
    }

    @Test
    void testResolveSids_WithNullSidsArray() throws CIFSException {
        doThrow(new CIFSException("SIDs array cannot be null")).when(sidResolver)
                .resolveSids(any(CIFSContext.class), anyString(), eq(null));

        assertThrows(IllegalStateException.class, n1AdjacentNodes::size));
    assertNodeRemovedFromGraphErrorMessage(
        assertThrows(IllegalStateException.class, n1Predecessors::size));
    assertNodeRemovedFromGraphErrorMessage(
        assertThrows(IllegalStateException.class, n1Successors::size));
    assertNodeRemovedFromGraphErrorMessage(

package jcifs.internal.smb2.nego;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;

import jcifs.Configuration;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.smb2.Smb2Constants;

package jcifs.pac.kerberos;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;

import javax.security.auth.kerberos.KerberosKey;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;

            // Intent: null root is invalid input
            assertThrows(NullPointerException.class, () -> SmbEnumerationUtil.list(null, "*", 0, null, null));
        }

        @Test
        @DisplayName("listFiles with null root throws NullPointerException")
        void listFiles_withNullRoot_throwsNpe() {
            // Intent: null root is invalid input

        SmbSessionImpl session = newSession();

        // No encryption context -> throws
        CIFSException notEnabled = assertThrows(CIFSException.class, () -> session.encryptMessage(new byte[] { 1 }));
        assertTrue(notEnabled.getMessage().contains("Encryption not enabled"));
        assertThrows(CIFSException.class, () -> session.decryptMessage(new byte[] { 1 }));

        // Set encryption context and verify delegation

    @Test
    @DisplayName("Test invalid configuration")
    void testInvalidConfiguration() {
        assertThrows(IllegalArgumentException.class, () -> new SimpleCircuitBreaker("invalid", 0, 2, 100));
        assertThrows(IllegalArgumentException.class, () -> new SimpleCircuitBreaker("invalid", 3, 0, 100));
        assertThrows(IllegalArgumentException.class, () -> new SimpleCircuitBreaker("invalid", 3, 2, -1));
    }

    @Test

            // Act + Assert
            SmbException ex = assertThrows(SmbException.class, () -> new SID(bad));
            assertTrue(ex.getMessage().contains("Bad textual SID format"));
        }

        @Test
        @DisplayName("Textual constructor null throws NullPointerException")
        void testTextualConstructorNull() {
            assertThrows(NullPointerException.class, () -> new SID((String) null));
        }

        // Close the authenticator
        auth.close();

        // All these operations should throw IllegalStateException
        assertThrows(IllegalStateException.class, () -> auth.getPassword());
        assertThrows(IllegalStateException.class, () -> auth.getPasswordAsCharArray());
        assertThrows(IllegalStateException.class, () -> {
            // This would normally be called during authentication