Add Azurite test container setup

backend/api.test/TestAzuriteStorage.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Threading.Tasks;
+using Azure.Storage.Blobs;
+using Testcontainers.Azurite;
+using Xunit;
+
+namespace Api.Test;
+
+public class TestAzuriteStorage : IAsyncLifetime
+{
+    private AzuriteContainer _container = null!;
+    private string _connectionString = null!;
+
+    public async ValueTask InitializeAsync()
+    {
+        (_container, _connectionString) = await TestSetupHelpers.ConfigureAzuriteStorage();
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _container.DisposeAsync();
+        GC.SuppressFinalize(this);
+    }
+
+    [Fact]
+    public async Task CheckThatJsonFileCanBeStored()
+    {
+        var clientOptions = new BlobClientOptions(BlobClientOptions.ServiceVersion.V2025_11_05);
+        var serviceClient = new BlobServiceClient(_connectionString, clientOptions);
+        var containerClient = serviceClient.GetBlobContainerClient("test-container");
+        await containerClient.CreateAsync(cancellationToken: TestContext.Current.CancellationToken);
+
+        var blobClient = containerClient.GetBlobClient("test.json");
+        await blobClient.UploadAsync(
+            BinaryData.FromString("{\"message\":\"hello\"}"),
+            TestContext.Current.CancellationToken
+        );
+
+        Assert.True(await blobClient.ExistsAsync(TestContext.Current.CancellationToken));
+    }
+}

backend/api.test/TestSetupHelpers.cs

@@ -15,15 +15,25 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 using Moq;
+using Testcontainers.Azurite;
 using Testcontainers.PostgreSql;
 using Xunit.Sdk;
 
 namespace Api.Test;
 
 public static class TestSetupHelpers
 {
+    private const string AzuriteVersion = "mcr.microsoft.com/azure-storage/azurite:3.36.0";
     private const string PostgresVersion = "postgres:17.10";
 
+    public static async Task<(AzuriteContainer, string)> ConfigureAzuriteStorage()
+    {
+        var container = new AzuriteBuilder(AzuriteVersion).Build();
+        await container.StartAsync();
+
+        return (container, container.GetConnectionString());
+    }
+
     public static async Task<(
         PostgreSqlContainer,
         string,

backend/api.test/api.test.csproj

@@ -12,7 +12,9 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.DataProtection" Version="10.0.10" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
+    <PackageReference Include="Azure.Storage.Blobs" Version="12.29.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
+    <PackageReference Include="Testcontainers.Azurite" Version="4.10.0" />
     <PackageReference Include="Testcontainers.PostgreSql" Version="4.10.0" />
     <!-- Override transitive SSH.NET pulled in by Testcontainers to patch GHSA-q939-rpr3-3284 -->
     <PackageReference Include="SSH.NET" Version="2026.0.0" />