refactor: Remove redundant private keyword from static fields, update namespace import, and adjust book handler test assertion.

Author: aalmada

src/ApiService/BookStore.ApiService.Tests/Handlers/BookHandlerTests.cs

@@ -1,5 +1,5 @@
 using BookStore.ApiService.Aggregates;
-using BookStore.ApiService.Commands.Books;
+using BookStore.ApiService.Commands;
 using BookStore.ApiService.Events;
 using BookStore.ApiService.Handlers.Books;
 using Marten;
@@ -35,7 +35,7 @@ public async Task CreateBookHandler_ShouldStartStreamWithBookAddedEvent()
         var result = BookHandlers.Handle(command, session);
 
         // Assert
-        await Assert.That(result).IsNotNull();
+        await Assert.That(result.Item1).IsNotNull();
         session.Events.Received(1).StartStream<BookAggregate>(
             command.Id,
             Arg.Is<BookAdded>(e => 

src/ApiService/BookStore.ApiService.Tests/JsonSerializationTests.cs

@@ -12,7 +12,7 @@ namespace BookStore.ApiService.Tests;
 public class JsonSerializationTests
 {
     // Static lazy initialization for better performance - shared across all tests
-    private static readonly Lazy<JsonSerializerOptions> _options = new(() => new()
+    static readonly Lazy<JsonSerializerOptions> _options = new(() => new()
     {
         PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
         Converters = { new System.Text.Json.Serialization.JsonStringEnumConverter(JsonNamingPolicy.CamelCase) }

src/Web/BookStore.Web.Tests/WebTests.cs

@@ -4,7 +4,7 @@ namespace BookStore.Web.Tests;
 
 public class WebTests
 {
-    private static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(30);
+    static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(30);
 
     [Test]
     [Category("Integration")]