@Override
    public void buildExtensionsAssembled(ModelBuildingEvent event) {
        Model model = new Model(event.model());

        try {
            pluginRepositories = projectBuildingHelper.createArtifactRepositories(
                    model.getPluginRepositories(), pluginRepositories, projectBuildingRequest);
        } catch (Exception e) {
            event.problems()
                    .add(

                result.getErrors().get(1));

        assertEquals(
                "'pluginRepositories.pluginRepository.id' is missing.",
                result.getErrors().get(2));

        assertEquals(
                "'pluginRepositories.pluginRepository.[null].url' is missing.",
                result.getErrors().get(3));
    }

    @Test

            ModelBase.Builder builder,
            ModelBase target,
            ModelBase source,
            boolean sourceDominant,
            Map<Object, Object> context) {
        builder.pluginRepositories(source.getPluginRepositories());
    }

    @Override
    protected void mergeModelBase_Repositories(
            ModelBase.Builder builder,
            ModelBase target,
            ModelBase source,

                    RepositoryPolicy.newBuilder().updatePolicy("never").build());
            effective = Settings.newBuilder(effective)
                    .repositories(List.of(central))
                    .pluginRepositories(List.of(centralWithNoUpdate))
                    .build();
        }

        // for the special case of a drive-relative Windows path, make sure it's absolute to save plugins from trouble

            validateRawRepositories(problems, m.getRepositories(), "repositories.repository.", EMPTY, request);

            validateRawRepositories(
                    problems, m.getPluginRepositories(), "pluginRepositories.pluginRepository.", EMPTY, request);

            Build build = m.getBuild();
            if (build != null) {
                validate20RawPlugins(problems, build.getPlugins(), "build.plugins.plugin.", EMPTY, request);

                .id("id" + Long.toHexString(entropy.nextLong()))
                .activation(a)
                .properties(props)
                .repositories(repos)
                .pluginRepositories(pluginRepos)
                .build();

        Profile clone = SettingsUtilsV4.convertToSettingsProfile(SettingsUtilsV4.convertFromSettingsProfile(p));

        assertEquals(p.getId(), clone.getId());

                validateRepositories(problems, profile.getRepositories(), prefix + "repositories.repository");
                validateRepositories(
                        problems, profile.getPluginRepositories(), prefix + "pluginRepositories.pluginRepository");
            }
        }

        List<Proxy> proxies = settings.getProxies();

        if (proxies != null) {
            Set<String> proxyIds = new HashSet<>();

            for (org.apache.maven.api.model.Repository pluginRepo : pluginRepos) {
                repositories.add(convertToSettingsRepository(pluginRepo));
            }
            profile.pluginRepositories(repositories);
        }

        return profile.build();
    }

    /**
     * @param settingsProfile
     * @return a profile
     */

                Object key = getRepositoryKey().apply(element);
                if (!merged.containsKey(key)) {
                    merged.put(key, element);
                }
            }

            builder.pluginRepositories(merged.values());
        }
    }

    /*
     * TODO: Whether duplicates should be removed looks like an option for the generated merger.
     */
    @Override

            validateRawRepositories(problems, m.getRepositories(), "repositories.repository.", EMPTY, request);

            validateRawRepositories(
                    problems, m.getPluginRepositories(), "pluginRepositories.pluginRepository.", EMPTY, request);

            Build build = m.getBuild();
            if (build != null) {
                validate20RawPlugins(problems, build.getPlugins(), "build.plugins.plugin.", EMPTY, request);