jellyfin/tests/Jellyfin.Server.Implementations.Tests/Localization/LocalizationManagerTests.cs

using System;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using BitFaster.Caching;
using Emby.Server.Implementations.Localization;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Model.Configuration;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;

namespace Jellyfin.Server.Implementations.Tests.Localization
{
    public class LocalizationManagerTests
    {
        [Fact]
        public void GetCountries_All_Success()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de-DE"
            });
            var countries = localizationManager.GetCountries().ToList();

            Assert.Equal(140, countries.Count);

            var germany = countries.FirstOrDefault(x => x.Name.Equals("DE", StringComparison.Ordinal));
            Assert.NotNull(germany);
            Assert.Equal("Germany", germany!.DisplayName);
            Assert.Equal("DEU", germany.ThreeLetterISORegionName);
            Assert.Equal("DE", germany.TwoLetterISORegionName);
        }

        [Fact]
        public async Task GetCultures_All_Success()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de-DE"
            });
            await localizationManager.LoadAll();
            var cultures = localizationManager.GetCultures().ToList();

            Assert.Equal(496, cultures.Count);

            var germany = cultures.FirstOrDefault(x => x.TwoLetterISOLanguageName.Equals("de", StringComparison.Ordinal));
            Assert.NotNull(germany);
            Assert.Equal("deu", germany!.ThreeLetterISOLanguageName);
            Assert.Equal("German", germany.DisplayName);
            Assert.Equal("German", germany.Name);
            Assert.Contains("deu", germany.ThreeLetterISOLanguageNames);
            Assert.Contains("ger", germany.ThreeLetterISOLanguageNames);
        }

        [Fact]
        public async Task TryGetISO6392TFromB_Success()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de-DE"
            });
            await localizationManager.LoadAll();

            string? isoT;

            // Translation ger -> deu
            Assert.True(localizationManager.TryGetISO6392TFromB("ger", out isoT));
            Assert.Equal("deu", isoT);

            // chi -> zho
            Assert.True(localizationManager.TryGetISO6392TFromB("chi", out isoT));
            Assert.Equal("zho", isoT);

            // eng is already ISO 639-2/T
            Assert.False(localizationManager.TryGetISO6392TFromB("eng", out isoT));
            Assert.Null(isoT);
        }

        [Theory]
        [InlineData("de")]
        [InlineData("deu")]
        [InlineData("ger")]
        [InlineData("german")]
        public async Task FindLanguageInfo_Valid_Success(string identifier)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de-DE"
            });
            await localizationManager.LoadAll();

            var germany = localizationManager.FindLanguageInfo(identifier);
            Assert.NotNull(germany);

            Assert.Equal("deu", germany!.ThreeLetterISOLanguageName);
            Assert.Equal("German", germany.DisplayName);
            Assert.Equal("German", germany.Name);
            Assert.Contains("deu", germany.ThreeLetterISOLanguageNames);
            Assert.Contains("ger", germany.ThreeLetterISOLanguageNames);
        }

        [Theory]
        [InlineData("mul", "Multiple languages")]
        [InlineData("und", "Undetermined")]
        [InlineData("mis", "Uncoded languages")]
        [InlineData("zxx", "No linguistic content; Not applicable")]
        public async Task FindLanguageInfo_ISO6392Only_Success(string code, string expectedDisplayName)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });
            await localizationManager.LoadAll();

            var culture = localizationManager.FindLanguageInfo(code);
            Assert.NotNull(culture);
            Assert.Equal(expectedDisplayName, culture.DisplayName);
            Assert.Equal(code, culture.ThreeLetterISOLanguageName);
        }

        [Theory]
        [InlineData("ell", "Greek")] // Comma truncation
        [InlineData("nld", "Dutch")] // Semicolon truncation
        [InlineData("ron", "Romanian")] // Semicolon truncation, multiple
        [InlineData("eng", "English")] // No truncation
        [InlineData("zh-CN", "Chinese (Simplified)")] // No truncation, with parentheses
        public async Task GetLanguageDisplayName_DelimitedName_ReturnsTruncatedName(string language, string expected)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });
            await localizationManager.LoadAll();

            var result = localizationManager.GetLanguageDisplayName(language);
            Assert.Equal(expected, result);
        }

        [Theory]
        [InlineData(null)]
        [InlineData("")]
        [InlineData("xyz")]
        public async Task GetLanguageDisplayName_InvalidInput_ReturnsNull(string? language)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });
            await localizationManager.LoadAll();

            var result = localizationManager.GetLanguageDisplayName(language!);
            Assert.Null(result);
        }

        [Fact]
        public async Task GetParentalRatings_Default_Success()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de-DE"
            });
            await localizationManager.LoadAll();
            var ratings = localizationManager.GetParentalRatings().ToList();

            Assert.Equal(56, ratings.Count);

            var tvma = ratings.FirstOrDefault(x => x.Name.Equals("TV-MA", StringComparison.Ordinal));
            Assert.NotNull(tvma);
            Assert.Equal(17, tvma!.RatingScore!.Score);
        }

        [Fact]
        public async Task GetParentalRatings_ConfiguredCountryCode_Success()
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                MetadataCountryCode = "DE"
            });
            await localizationManager.LoadAll();
            var ratings = localizationManager.GetParentalRatings().ToList();

            Assert.Equal(34, ratings.Count);

            var fsk = ratings.FirstOrDefault(x => x.Name.Equals("FSK-12", StringComparison.Ordinal));
            Assert.NotNull(fsk);
            Assert.Equal(12, fsk!.RatingScore!.Score);
        }

        [Theory]
        [InlineData("CA-R", "CA", 18, 1)]
        [InlineData("FSK-16", "DE", 16, null)]
        [InlineData("FSK-18", "DE", 18, null)]
        [InlineData("FSK-18", "US", 18, null)]
        [InlineData("TV-MA", "US", 17, 1)]
        [InlineData("XXX", "asdf", 1000, null)]
        [InlineData("Germany: FSK-18", "DE", 18, null)]
        [InlineData("Rated : R", "US", 17, 0)]
        [InlineData("Rated: R", "US", 17, 0)]
        [InlineData("Rated R", "US", 17, 0)]
        [InlineData(" PG-13 ", "US", 13, 0)]
        [InlineData("T", "IT", 0, null)]
        [InlineData("VM6", "IT", 6, null)]
        [InlineData("VM12", "IT", 12, null)]
        [InlineData("VM14", "IT", 14, null)]
        [InlineData("VM18", "IT", 18, null)]
        [InlineData("IT-VM14", "IT", 14, null)] // TMDB style country prefix
        [InlineData("IT-VM18", "IT", 18, null)]
        [InlineData("it-vm18", "IT", 18, null)] // Rating strings are case insensitive
        [InlineData("VM 18", "IT", 18, null)]
        [InlineData("Vietato ai minori di 18 anni", "IT", 18, null)]
        [InlineData("ATP", "AR", 0, null)]
        [InlineData("SAM 13", "AR", 13, null)]
        [InlineData("SAM 16", "AR", 16, null)]
        [InlineData("SAM 18", "AR", 18, null)]
        [InlineData("SAM13", "AR", 13, null)] // Written without a space
        [InlineData("AR-SAM 16", "AR", 16, null)] // Country prefix stripped against the configured country
        [InlineData("AR-SAM 13", "US", 13, null)] // Country prefix resolved via the separator fallback
        [InlineData("AR-SAM 18", "US", 18, null)]
        [InlineData("AR-SAM13", "US", 13, null)]
        [InlineData("SAM 18 C", "AR", 1001, null)] // Condicionada, same as "C"
        [InlineData("Interdit aux moins de 12 ans", "FR", 12, null)]
        [InlineData("Interdit aux moins de 18 ans", "FR", 18, null)]
        [InlineData("X 18+", "AU", 1000, 0)] // Official spelling of the Australian X rating
        [InlineData("X18+", "AU", 1000, 0)]
        [InlineData("FSK18", "DE", 18, null)] // Written without a space
        [InlineData("ab 18", "DE", 18, null)] // Written as the minimum age
        [InlineData("DE:ab 6", "DE", 6, null)]
        [InlineData("–12", "FR", 12, null)] // The CNC writes its minimum ages with an en dash
        [InlineData("–16", "FR", 16, null)]
        [InlineData("–18", "FR", 18, null)]
        [InlineData("SU", "ID", 0, null)] // Indonesian broadcast classifications (KPI)
        [InlineData("P", "ID", 2, null)]
        [InlineData("A", "ID", 7, null)]
        [InlineData("R", "ID", 13, null)]
        [InlineData("D", "ID", 18, null)]
        [InlineData("D18+", "ID", 18, null)] // Written with the minimum age, as broadcast since 2016
        [InlineData("R-BO", "ID", 13, null)] // Parental guidance does not change the age group
        [InlineData("Dewasa", "ID", 18, null)]
        [InlineData("ID-D", "ID", 18, null)] // TMDB style country prefix
        [InlineData("ID-D", "US", 18, null)] // Country prefix resolved via the separator fallback
        [InlineData("P", "US", 1000, null)] // Ambiguous outside Indonesia, preferred as the Portuguese "Pornográfico"
        public async Task GetRatingLevel_GivenValidString_Success(string value, string countryCode, int? expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();
            var score = localizationManager.GetRatingScore(value);
            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        // Rating strings are stored mixed-case in the *.json rating systems and must match regardless of casing
        [InlineData("btl", "se", 0, null)] // Direct lookup, lowercase of "Btl"
        [InlineData("BARNTILLÅTEN", "se", 0, null)] // Direct lookup, uppercase incl. diacritics
        [InlineData("SE-BTL", "se", 0, null)] // Country prefix stripped against the configured country
        [InlineData("SE-BTL", "us", 0, null)] // Country prefix resolved via the separator fallback
        [InlineData("Från 7 År", "se", 7, null)] // Diacritic casing (json has "Från 7 år")
        [InlineData("SE-Från 7 År", "us", 7, null)] // Same, via the separator fallback
        [InlineData("fsk-16", "de", 16, null)] // Not Sweden specific: lowercase of "FSK-16"
        public async Task GetRatingScore_IsCaseInsensitive_Success(string value, string countryCode, int? expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(value);

            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        [InlineData("0", 0, null)]
        [InlineData("1", 1, null)]
        [InlineData("6", 6, null)]
        [InlineData("12", 12, null)]
        [InlineData("42", 42, null)]
        [InlineData("9999", 9999, null)]
        // The French CNC writes minimum ages as "-12" ("not for under 12s"). Parsing that as -12 would
        // put the item below every MaxParentalRatingScore and bypass parental control entirely.
        [InlineData("-10", 10, null)]
        [InlineData("-12", 12, null)]
        [InlineData("-16", 16, null)]
        [InlineData("-18", 18, null)]
        public async Task GetRatingLevel_GivenValidAge_Success(string value, int? expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration { MetadataCountryCode = "nl" });
            await localizationManager.LoadAll();
            var score = localizationManager.GetRatingScore(value);
            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Fact]
        public async Task GetRatingLevel_GivenUnratedString_Success()
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                UICulture = "de-DE"
            });
            await localizationManager.LoadAll();
            Assert.Null(localizationManager.GetRatingScore("NR"));
            Assert.Null(localizationManager.GetRatingScore("unrated"));
            Assert.Null(localizationManager.GetRatingScore("Not Rated"));
            Assert.Null(localizationManager.GetRatingScore("n/a"));
            Assert.Null(localizationManager.GetRatingScore("N/A"));
            Assert.Null(localizationManager.GetRatingScore(" n/a "));
        }

        [Theory]
        // "NR" and "UR" are rating strings of some systems, so they must stay unrated when listed alongside others
        [InlineData("NR / R", 17, 0)]
        [InlineData("unrated / R", 17, 0)]
        [InlineData("R / NR", 17, 0)]
        public async Task GetRatingLevel_SkipsUnratedListEntries_Success(string value, int? expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration { MetadataCountryCode = "us" });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(value);

            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        // Ratings that contain a '/' themselves must not be split into a list of ratings
        [InlineData("M/3", "pt", 3, null)]
        [InlineData("M/12", "pt", 12, null)]
        [InlineData("M/18", "pt", 18, null)]
        [InlineData("PT-M/12", "pt", 12, null)] // TMDB style country prefix
        [InlineData("M/12", "us", 12, null)] // Resolved through the all-systems fallback
        [InlineData("U/A 13+", "in", 13, null)]
        [InlineData("7/i", "es", 11, null)]
        [InlineData("7/i/fig", "es", 11, null)]
        [InlineData("18/fig", "es", 18, null)]
        public async Task GetRatingScore_RatingContainingSlash_IsNotSplit(string value, string countryCode, int expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(value);

            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        // Providers list every spelling of a rating in a single field. Splitting such a list by its country
        // prefix pairs the first entry's country with the last entry's rating, so it has to be split by '/' first.
        [InlineData("DE:FSK 18 / DE:FSK-18 / DE:FSK18 / DE:18 / DE:ab 18", "de", 18, null)]
        [InlineData("SE:15 / SE:15+ / SE:Från 15 år", "de", 15, null)]
        [InlineData("FR:16 / US:12", "de", 16, null)] // The first entry that resolves wins
        public async Task GetRatingScore_CountryPrefixedList_UsesFirstResolvingEntry(string value, string countryCode, int expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration { MetadataCountryCode = countryCode });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(value);

            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Fact]
        public async Task GetRatingScore_ResolvedCountryPrefixedList_DoesNotWarn()
        {
            var logger = new Mock<ILogger<LocalizationManager>>();
            var localizationManager = Setup(new ServerConfiguration { MetadataCountryCode = "de" }, logger.Object);
            await localizationManager.LoadAll();

            Assert.NotNull(localizationManager.GetRatingScore("DE:FSK 18 / DE:FSK-18 / DE:FSK18 / DE:18 / DE:ab 18"));

            logger.Verify(
                x => x.Log(
                    LogLevel.Warning,
                    It.IsAny<EventId>(),
                    It.IsAny<It.IsAnyType>(),
                    It.IsAny<Exception?>(),
                    It.IsAny<Func<It.IsAnyType, Exception?, string>>()),
                Times.Never);
        }

        [Fact]
        public async Task GetRatingScore_ListWithoutKnownRating_WarnsOnce()
        {
            var logger = new Mock<ILogger<LocalizationManager>>();
            var localizationManager = Setup(new ServerConfiguration { MetadataCountryCode = "de" }, logger.Object);
            await localizationManager.LoadAll();

            Assert.Null(localizationManager.GetRatingScore("DE:Unbekannt / DE:Unsinn"));

            logger.Verify(
                x => x.Log(
                    LogLevel.Warning,
                    It.IsAny<EventId>(),
                    It.IsAny<It.IsAnyType>(),
                    It.IsAny<Exception?>(),
                    It.IsAny<Func<It.IsAnyType, Exception?, string>>()),
                Times.Once);
        }

        [Theory]
        [InlineData("-NO RATING SHOWN-")]
        [InlineData(":NO RATING SHOWN:")]
        public async Task GetRatingLevel_Split_Success(string value)
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                UICulture = "en-US"
            });
            await localizationManager.LoadAll();

            Assert.Null(localizationManager.GetRatingScore(value));
        }

        [Theory]
        [InlineData("TV-MA", "DE", 17, 1)] // US-only rating, DE country code
        [InlineData("PG-13", "FR", 13, 0)] // US-only rating, FR country code
        [InlineData("R", "JP", 17, 0)] // US-only rating, JP country code
        public async Task GetRatingScore_FallbackPrioritizesUS_Success(string rating, string countryCode, int expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(rating);

            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        [InlineData("US:INVALID", "US")] // Colon separator, known country code, unknown rating
        [InlineData("us:INVALID", "US")] // Colon separator, lowercase country code
        [InlineData("DE-INVALID", "US")] // Hyphen separator, known language prefix, unknown rating
        [InlineData("ca:INVALID", "US")] // Colon separator, known country code (Canada)
        public async Task GetRatingScore_UnknownRatingWithKnownCountry_ReturnsNull(string rating, string countryCode)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();

            Assert.Null(localizationManager.GetRatingScore(rating));
        }

        [Theory]
        [InlineData("us:R", "DE", 17, 0)] // Colon separator, explicit US country, valid US rating
        [InlineData("US:PG-13", "DE", 13, 0)] // Colon separator, explicit US country, valid US rating
        [InlineData("ca:R", "US", 18, 1)] // Colon separator, Canada country code, valid CA rating
        public async Task GetRatingScore_ValidRatingWithCountrySeparator_ReturnsScore(string rating, string countryCode, int expectedScore, int? expectedSubScore)
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                MetadataCountryCode = countryCode
            });
            await localizationManager.LoadAll();

            var score = localizationManager.GetRatingScore(rating);
            Assert.NotNull(score);
            Assert.Equal(expectedScore, score.Score);
            Assert.Equal(expectedSubScore, score.SubScore);
        }

        [Theory]
        [InlineData("Default", "Default")]
        [InlineData("HeaderLiveTV", "Live TV")]
        public void GetLocalizedString_Valid_Success(string key, string expected)
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                UICulture = "en-US"
            });

            var translated = localizationManager.GetLocalizedString(key);
            Assert.NotNull(translated);
            Assert.Equal(expected, translated);
        }

        [Fact]
        public void GetLocalizedString_Invalid_Success()
        {
            var localizationManager = Setup(new ServerConfiguration()
            {
                UICulture = "en-US"
            });

            var key = "SuperInvalidTranslationKeyThatWillNeverBeAdded";

            var translated = localizationManager.GetLocalizedString(key);
            Assert.NotNull(translated);
            Assert.Equal(key, translated);
        }

        [Fact]
        public void GetLocalizedString_WithCulture_ReturnsTranslation()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });

            var translated = localizationManager.GetLocalizedString("Artists", "de");
            Assert.Equal("Künstler", translated);
        }

        [Fact]
        public void GetLocalizedString_WithCulture_FallsBackToEnUs()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });

            // A culture with no translation file should fall back to en-US
            var translated = localizationManager.GetLocalizedString("Artists", "zz");
            Assert.Equal("Artists", translated);
        }

        [Fact]
        public void GetLocalizedString_WithBcp47Normalization_ReturnsTranslation()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });

            // es-419 is stored as es_419 in Jellyfin
            var translated = localizationManager.GetLocalizedString("Default", "es-419");
            Assert.NotEqual("Default", translated);
        }

        [Fact]
        public void GetLocalizedString_WithBcp47NormalizationToUppercaseRegion_ReturnsTranslation()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });

            // he-IL normalizes to the underscore resource he_IL. The resource lookup is case-sensitive,
            // so the region casing has to be preserved or the file is not found and we fall back to en-US.
            var translated = localizationManager.GetLocalizedString("Books", "he-IL");
            Assert.Equal("ספרים", translated);
        }

        [Fact]
        public void GetServerLocalizedString_UsesServerCulture()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "de"
            });

            // Even if CurrentUICulture is fr, GetServerLocalizedString should use the server's "de"
            var previousCulture = CultureInfo.CurrentUICulture;
            try
            {
                CultureInfo.CurrentUICulture = CultureInfo.GetCultureInfo("fr");
                var translated = localizationManager.GetServerLocalizedString("Artists");
                Assert.Equal("Künstler", translated);
            }
            finally
            {
                CultureInfo.CurrentUICulture = previousCulture;
            }
        }

        [Fact]
        public void GetLocalizedString_UsesCurrentUICulture()
        {
            var localizationManager = Setup(new ServerConfiguration
            {
                UICulture = "en-US"
            });

            var previousCulture = CultureInfo.CurrentUICulture;
            try
            {
                CultureInfo.CurrentUICulture = CultureInfo.GetCultureInfo("de");
                var translated = localizationManager.GetLocalizedString("Artists");
                Assert.Equal("Künstler", translated);
            }
            finally
            {
                CultureInfo.CurrentUICulture = previousCulture;
            }
        }

        [Fact]
        public void GetSupportedUICultures_IncludesCommonCultures()
        {
            var supported = LocalizationManager.GetSupportedUICultures();
            Assert.Contains(supported, c => c.Name.Equals("de", StringComparison.OrdinalIgnoreCase));
            Assert.Contains(supported, c => c.Name.Equals("en-US", StringComparison.OrdinalIgnoreCase));
            Assert.Contains(supported, c => c.Name.Equals("fr", StringComparison.OrdinalIgnoreCase));
            // Underscore variants get normalized to BCP-47 hyphen form for CultureInfo compatibility.
            Assert.Contains(supported, c => c.Name.Equals("es-419", StringComparison.OrdinalIgnoreCase));
        }

        private LocalizationManager Setup(ServerConfiguration config, ILogger<LocalizationManager>? logger = null)
        {
            var mockConfiguration = new Mock<IServerConfigurationManager>();
            mockConfiguration.SetupGet(x => x.Configuration).Returns(config);

            return new LocalizationManager(mockConfiguration.Object, logger ?? new NullLogger<LocalizationManager>());
        }
    }
}