chore: The very first Blazor test

WotBlitzStatisticsPro.Blazor.Tests/MainLayoutTest.cs

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+using System.Threading;
+using Bunit;
+using FluentAssertions;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using Moq;
+using NUnit.Framework;
+using Radzen;
+using WotBlitzStatisticsPro.Blazor.Messages;
+using WotBlitzStatisticsPro.Blazor.Services;
+using WotBlitzStatisticsPro.Blazor.Shared;
+
+namespace WotBlitzStatisticsPro.Blazor.Tests
+{
+    public class MainLayoutTest: TestContextWrapper
+    {
+        private readonly Mock<IMediator> _mediatorMock = new();
+        private readonly Mock<ISearchDialogService> _searchServiceMock = new();
+        private IRenderedComponent<MainLayout> _component;
+
+        [SetUp]
+        public void Setup()
+        {
+            TestContext = new Bunit.TestContext();
+            TestContext.Services.AddSingleton(_mediatorMock.Object);
+
+            TestContext.Services.AddSingleton<DialogService>();
+            TestContext.Services.AddSingleton(_searchServiceMock.Object);
+            TestContext.Services.AddLocalization();
+
+            _component = TestContext.RenderComponent<MainLayout>();
+        }
+
+        [Test]
+        public void ShouldFireMediatorEventEachTimeWhenLanguageChanged()
+        {
+            // =====================================
+            // Hint for css lookup
+            /*
+By.css('.classname')          // get by class name
+By.css('input[type=radio]')   // get input by type radio
+By.css('.parent .child')      // get child who has a parent
+             */
+
+            // Take a look at the component text
+            // var html = _component.Markup;
+
+            // =====================================
+
+            // All 3 languages in a RadzenSplitButton
+            var elements = _component.FindAll(".rz-menuitem");
+
+            elements.Should().NotBeNull();
+            elements.Count.Should().Be(3);
+
+            string[] expectedLanguages = {"en-US", "ru-RU", "de-DE"};
+            for (int i = 0; i < 3; i++)
+            {
+                elements[i].Click();
+                _mediatorMock.Verify(m => m.Publish(
+                    It.Is<ChangeCurrentCultureMessage>(m => m.CultureName == expectedLanguages[0]), 
+                    It.IsAny<CancellationToken>()), Times.Once);
+            }
+        }
+
+        [TearDown]
+        public void TearDown() => TestContext?.Dispose();
+    }
+}

WotBlitzStatisticsPro.Blazor.Tests/WotBlitzStatisticsPro.Blazor.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="bunit.web" Version="1.1.5" />
+    <PackageReference Include="FluentAssertions" Version="5.10.3" />
+    <PackageReference Include="Moq" Version="4.16.1" />
+    <PackageReference Include="NUnit" Version="3.12.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="Radzen.Blazor" Version="3.2.8" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\WotBlitzStatisticsPro.Blazor\WotBlitzStatisticsPro.Blazor.csproj" />
+    <ProjectReference Include="..\WotBlitzStatisticsPro.Common\WotBlitzStatisticsPro.Common.csproj" />
+  </ItemGroup>
+
+</Project>