初步

tests/ElectionSystem.Api.Tests/ElectionSystem.Api.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.17" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.17" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\ElectionSystem.Api\ElectionSystem.Api.csproj" />
+  </ItemGroup>
+
+</Project>

tests/ElectionSystem.Api.Tests/PersistenceModelTests.cs

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+using ElectionSystem.Api.Infrastructure.Auditing;
+using ElectionSystem.Api.Infrastructure.Persistence;
+using ElectionSystem.Api.Modules.Identity.Domain;
+using Microsoft.EntityFrameworkCore;
+
+namespace ElectionSystem.Api.Tests;
+
+public sealed class PersistenceModelTests
+{
+    [Fact]
+    public async Task UserName_must_be_unique()
+    {
+        var options = new DbContextOptionsBuilder<ElectionDbContext>().UseInMemoryDatabase(Guid.NewGuid().ToString()).Options;
+        await using var context = new ElectionDbContext(options);
+        context.Users.Add(new ApplicationUser { UserName = "admin", DisplayName = "Administrator" });
+        await context.SaveChangesAsync();
+        var index = context.Model.FindEntityType(typeof(ApplicationUser))!.GetIndexes().Single(x => x.Properties.Single().Name == nameof(ApplicationUser.UserName));
+        Assert.True(index.IsUnique);
+    }
+
+    [Fact]
+    public void Audit_entry_does_not_contain_vote_content_field()
+    {
+        var properties = typeof(AuditEntry).GetProperties().Select(property => property.Name);
+        Assert.DoesNotContain(properties, property => property.Contains("Vote", StringComparison.OrdinalIgnoreCase));
+    }
+}