Dalamud/Dalamud.Test/LocalizationTests.cs

using System.IO;
using System.Reflection;
using Xunit;

namespace Dalamud.Test {
    public class LocalizationTests {
        private readonly Localization localization;
        private string currentLangCode;
        
        public LocalizationTests() {
            var workingDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            this.localization = new Localization(workingDir);
            this.localization.OnLocalizationChanged += code => this.currentLangCode = code;
        }

        [Fact]
        public void SetupWithFallbacks_EventInvoked() {
            this.localization.SetupWithFallbacks();
            Assert.Equal("en", this.currentLangCode);
        }
    }
}