src/Lucene.Net.TestFramework/Support/Configuration/ConfigurationSettingTestCase.cs

using Lucene.Net.Util;
using Microsoft.Extensions.Configuration;
using System;

namespace Lucene.Net.Configuration
{
    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    /// <summary>
    /// Base class for testing configuration settings.
    /// </summary>
    [CLSCompliant(false)]
    public abstract class ConfigurationSettingsTestCase : LuceneTestCase
    {
        internal IProperties SystemProperties { get; private set; }

        [CLSCompliant(false)]
        public IConfigurationSettings ConfigurationSettings { get; private set; }

        protected abstract IConfiguration LoadConfiguration();

        public override void BeforeClass()
        {
            base.BeforeClass();
            var configuration = LoadConfiguration();
            // Set up mocks for ConfigurationSettings and SystemProperties
            ConfigurationSettings = new ConfigurationSettingsImpl(configuration);
            var factory = new ConfigurationFactoryImpl(ConfigurationSettings);
            SystemProperties = new Properties(() => factory);
        }

        private class ConfigurationFactoryImpl : IConfigurationFactory
        {
            private readonly IConfigurationSettings configurationSettings;

            public ConfigurationFactoryImpl(IConfigurationSettings configurationSettings)
            {
                this.configurationSettings = configurationSettings ?? throw new ArgumentNullException(nameof(configurationSettings));
            }

            public IConfiguration GetConfiguration()
            {
                return configurationSettings.CurrentConfiguration;
            }
        }

        [CLSCompliant(false)]
        public interface IConfigurationSettings
        {
            [CLSCompliant(false)]
            IConfiguration CurrentConfiguration { get; }
        }

        public class ConfigurationSettingsImpl : IConfigurationSettings
        {
            private readonly IConfiguration configuration;

            [CLSCompliant(false)]
            public ConfigurationSettingsImpl(IConfiguration configuration)
            {
                this.configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
            }

            [CLSCompliant(false)]
            public IConfiguration CurrentConfiguration => configuration;
        }
    }
}