Add MakeDraftCommandHandlerTests tests

tests/Blogger.IntegrationTests/Articles/MakeDraftCommandHandlerTests.cs

@@ -0,0 +1,54 @@
+using Blogger.Application.Articles.GetTags;
+using Blogger.Application.Articles.MakeDraft;
+using Blogger.Domain.ArticleAggregate;
+using Blogger.Infrastructure.Persistence.Repositories;
+using Blogger.IntegrationTests.Fixtures;
+
+using FluentAssertions;
+
+namespace Blogger.IntegrationTests.Articles;
+public class MakeDraftCommandHandlerTests : IClassFixture<BloggerDbContextFixture>
+{
+    private readonly BloggerDbContextFixture _fixture;
+
+    public MakeDraftCommandHandlerTests(BloggerDbContextFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    [Fact]
+    public async Task Handle_ShouldCreateDraft_WhenDraftDoesNotExist()
+    {
+        // Arrange
+        var request = new MakeDraftCommand("Existing Draft", "Draft body", "Draft summary", []);
+        var articleRepository = new ArticleRepository(_fixture.BuildDbContext(Guid.NewGuid().ToString()));
+        var sut = new MakeDraftCommandHandler(articleRepository);
+
+        // Act
+        var response = await sut.Handle(request, CancellationToken.None);
+
+        // Assert
+        response.Should().NotBeNull();
+        response.DraftId.Should().Be(ArticleId.CreateUniqueId(request.Title)); 
+    }
+
+    [Fact]
+    public async Task Handle_ShouldThrowDraftAlreadyExistsException_WhenDraftAlreadyExists()
+    {
+        // Arrange
+        var request = new MakeDraftCommand("Existing Draft", "Draft body", "Draft summary", []);
+        var articleRepository = new ArticleRepository(_fixture.BuildDbContext(Guid.NewGuid().ToString()));
+        var sut = new MakeDraftCommandHandler(articleRepository);
+
+        var oldDraft = Article.CreateDraft("Existing Draft", "Draft body", "Draft summary");
+
+        articleRepository.Add(oldDraft);
+        await articleRepository.SaveChangesAsync(CancellationToken.None);
+
+        // Act
+        var draft = async () => await sut.Handle(request, CancellationToken.None);
+
+        // Assert
+        await draft.Should().ThrowAsync<DraftAlreadyExistsException>();
+    }
+}