DefaultProjectBuildingResult result = new DefaultProjectBuildingResult(null, null, problems);
        results.add(result);

        ProjectBuildingException exception = new ProjectBuildingException(results);
        String message = exception.getMessage();

        when(session.getRequest()).thenReturn(executionRequest);
        Session sessionv4 = mock(Session.class);
        when(session.getSession()).thenReturn(sessionv4);
        when(sessionv4.getToolchains()).thenReturn(toolchainModels);

        List<Toolchain> toolchains = toolchainManager.getToolchains(session, "unknown", null);

		return i, Number, err
	case '-':
		if c = d.next(); c < '0' || c > '9' {
			return nil, Unknown, d.mkError(ErrSyntax, "in negative numeric literal")
		}
		n, err := d.number()
		if err != nil {
			return nil, Unknown, err
		}
		return -n, Number, nil
	case 'f':
		if d.remaining() < 4 {
			return nil, Unknown, d.mkError(ErrUnexpectedEOF)
		}
		//nolint:gocritic

    /**
     * Gets the identifier of the project that could not be built. The general format of the identifier is {@code
     * <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the exception
     * is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the project or an empty string if not known, never {@code null}.
     */

     * @param cause the cause (which is saved for later retrieval by the {@link #getCause()} method).
     *              (A {@code null} value is permitted, and indicates that the cause is nonexistent or unknown.)
     */
    public CrawlerSystemException(final String message, final Throwable cause) {
        super(message, cause);
    }

    /**

        }
    }

    @Test
    public void testCreateProviderUnknown() {
        RdmaProvider provider = RdmaProviderFactory.createProvider("unknown");
        assertNull(provider, "Unknown provider should return null");
    }

    @Test
    public void testSelectBestProvider() {
        RdmaProvider provider = RdmaProviderFactory.selectBestProvider();

    }

    @Test
    @DisplayName("Unknown DOS error code yields empty Optional")
    void testUnknownCode() {
        Optional<Integer> noMatch = findNtStatus(0xdeadbeef);
        assertFalse(noMatch.isPresent(), "Mapping for unknown code should be absent");
    }

    @Test
    @DisplayName("Mocked consumer receives correct NTSTATUS value")

        buffer.append((groupId != null && !groupId.isEmpty()) ? groupId : "[unknown-group-id]");
        buffer.append(':');
        buffer.append((artifactId != null && !artifactId.isEmpty()) ? artifactId : "[unknown-artifact-id]");
        buffer.append(':');
        buffer.append((version != null && !version.isEmpty()) ? version : "[unknown-version]");

        return buffer.toString();
    }

    /**

		return payload, 0, 0, fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
	}

	if bytes.Equal(buf[4:8], []byte("1   ")) {
		// Set as 1,0.
		major, minor = 1, 0
	} else {
		major, minor = binary.LittleEndian.Uint16(buf[4:6]), binary.LittleEndian.Uint16(buf[6:8])
	}
	if major > xlVersionMajor {
		return buf[8:], major, minor, fmt.Errorf("xlMeta: unknown major version %d found", major)
	}

     */
    @Nonnull
    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that
     * is given by {@link #getSource()}.
     *
     * @return the one-based index of the line containing the problem or a non-positive value if unknown
     */
    int getLineNumber();