assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
  public void testAdd_nullUnsupported() {
    assertThrows(NullPointerException.class, () -> collection.add(null));
    expectUnchanged();
    expectNullMissingWhenNullUnsupported("Should not contain null after unsupported add(null)");
  }

        MavenSession session = new MavenSession(
                getContainer(), repoSession, new DefaultMavenExecutionRequest(), new DefaultMavenExecutionResult());
        session.setSession(defaultSessionFactory.newSession(session));

        DefaultSession s = new DefaultSession(session, null, null, null, null, null);

                treeResponse.service = "testService";
                treeResponse.shareIsInDfs = true;
            }
            return null;
        }).when(session).send(any(ServerMessageBlock.class), any(ServerMessageBlock.class));

        // Test tree connect
        tree.treeConnect(null, null);

        assertEquals(2, tree.connectionState);
        assertEquals(456, tree.tid);

            final byte[] unicodeHash) {
        if (domain == null || username == null || ansiHash == null || unicodeHash == null) {
            throw new IllegalArgumentException("External credentials cannot be null");
        }
        this.domain = domain;
        this.username = username;
        this.password = null;
        this.challenge = challenge;
        this.ansiHash = ansiHash;

     *
     * @return The decrypted server or {@code null}.
     */
    Server getServer();

    /**
     * Gets the decrypted servers.
     *
     * @return The decrypted server, can be empty but never {@code null}.
     */
    List<Server> getServers();

    /**

 */
@Deprecated(since = "4.0.0")
public class MavenToolchainMerger {

    public void merge(PersistedToolchains dominant, PersistedToolchains recessive, String recessiveSourceLevel) {
        if (dominant == null || recessive == null) {
            return;
        }

        recessive.setSourceLevel(recessiveSourceLevel);

        shallowMerge(dominant.getToolchains(), recessive.getToolchains(), recessiveSourceLevel);
    }

                .installationSettingsSource(
                        installationSettingsPath != null && Files.exists(installationSettingsPath)
                                ? Sources.fromPath(installationSettingsPath)
                                : null)
                .projectSettingsSource(
                        projectSettingsPath != null && Files.exists(projectSettingsPath)

    // Parse the address, and make sure the length/version is correct.
    Scope scope = parseScope ? new Scope() : null;
    byte[] addr = ipStringToBytes(ipString, scope);
    if (addr == null || addr.length != expectBytes) {
      return null;
    }

    return bytesToInetAddress(addr, (scope != null) ? scope.scope : null);
  }

  /**

                    break;
                }
            }
            if (this.authMethod == null) {
                return null;
            }
            NtlmMessage message = authorization != null ? new Type2Message(Base64.decode(authorization)) : null;
            reconnect();
            if (message == null) {
                message = new Type1Message(this.transportContext);

    assertThat(expected).hasMessageThat().isEqualTo("null");
  }

  public void testCheckArgument_nullMessageWithArgs_failure() {
    IllegalArgumentException e =
        assertThrows(IllegalArgumentException.class, () -> checkArgument(false, null, "b", "d"));
    assertThat(e).hasMessageThat().isEqualTo("null [b, d]");
  }