* @return The effective repositories or {@code null} if the input was {@code null}.
     */
    List<ArtifactRepository> getEffectiveRepositories(List<ArtifactRepository> repositories);

    /**
     * Determines the mirror for the specified repository.
     *
     * @param repository The repository to determine the mirror for, must not be {@code null}.

                    plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());

            pluginManager.setupPluginRealm(pluginDescriptor, session, null, null, null);
        } catch (Exception e) {
            throw new PluginManagerException(plugin, e.getMessage(), e);
        }

        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();

        @Test
        @DisplayName("Should return null when hash algorithms is null")
        void testGetHashAlgosNull() {
            PreauthIntegrityNegotiateContext context = new PreauthIntegrityNegotiateContext(mockConfig, null, new byte[] { 0x01 });

            assertNull(context.getHashAlgos());
        }

        @Test
        @DisplayName("Should return null when salt is null")
        void testGetSaltNull() {

    static ArtifactInstallerRequest build(Session session, Collection<ProducedArtifact> artifacts) {
        return builder()
                .session(requireNonNull(session, "session cannot be null"))
                .artifacts(requireNonNull(artifacts, "artifacts cannot be null"))
                .build();
    }

    @NotThreadSafe
    class ArtifactInstallerRequestBuilder {
        Session session;
        RequestTrace trace;

            return null;
        }

        @Override
        public org.lastaflute.job.subsidiary.RegisteredJob registerNonCron(Class<? extends org.lastaflute.job.LaJob> jobType,
                org.lastaflute.job.subsidiary.JobConcurrentExec concurrentExec, org.lastaflute.job.subsidiary.InitialCronOpCall opLambda) {
            return null;
        }

        @Override

        if (_conditionQuery != null) {
            QueryBuilder queryBuilder = _conditionQuery.getQuery();
            if (queryBuilder != null) {
                builder.setQuery(queryBuilder);
            }
            _conditionQuery.getFieldSortBuilderList().forEach(sort -> {
                builder.addSort(sort);
            });
        }

        if (_conditionAggregation != null) {

        if (createdBy != null) {
            addFieldToSource(sourceMap, "createdBy", createdBy);
        }
        if (createdTime != null) {
            addFieldToSource(sourceMap, "createdTime", createdTime);
        }
        if (expiredTime != null) {
            addFieldToSource(sourceMap, "expiredTime", expiredTime);
        }
        if (name != null) {
            addFieldToSource(sourceMap, "name", name);

        if (_conditionQuery != null) {
            QueryBuilder queryBuilder = _conditionQuery.getQuery();
            if (queryBuilder != null) {
                builder.setQuery(queryBuilder);
            }
            _conditionQuery.getFieldSortBuilderList().forEach(sort -> {
                builder.addSort(sort);
            });
        }

        if (_conditionAggregation != null) {

        return as;
    }

    @Override
    public int getStartPosition() {
        if (start == null) {
            start = ComponentUtil.getFessConfig().getPagingSearchPageStartAsInteger();
        }
        return start;
    }

    @Override
    public int getOffset() {
        if (offset == null) {
            offset = 0;
        }
        return offset;
    }

    @Override

        assertNull(languageHelper.getSupportedLanguage(null));
        assertNull(languageHelper.getSupportedLanguage(""));
        assertNull(languageHelper.getSupportedLanguage("   "));
    }

    public void test_setDetector() {
        // Test with null detector
        languageHelper.setDetector(null);
        assertNull(languageHelper.detector);
    }