c#
[Fact]
    public async Task UpdatePost_OwnPost_ReturnsOk()
    {
        // Arrange
        var (token, userId) = await factory.AuthenticateUser("updateuser1");
        _client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

        var postId = await factory.CreateTestPost(userId, "Original Title", "Original body content");

        var updateRequest = new UpdatePost.Request(
            postId,
            "Updated Title",
            "Updated body content",
            new Uri("https://example.com/updated.jpg")
        );

        // Act
        var response = await _client.PutAsJsonAsync($"/api/posts/{postId}", updateRequest);

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var result = await response.Content.ReadFromJsonAsync<UpdatePost.Response>(_jsonOptions);

        result.Should().NotBeNull();
        result.Id.Should().Be(postId);
        result.Title.Should().Be(updateRequest.Title);

        // Verify database was updated
        using var scope = factory.Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<BlogDbContext>();
        var updatedPost = await dbContext.Posts.FindAsync(postId);
        updatedPost.Should().NotBeNull();
        updatedPost.Title.Should().Be(updateRequest.Title);
        updatedPost.Body.Should().Be(updateRequest.Body);
        updatedPost.CoverImageUrl.Should().Be(updateRequest.CoverImageUrl);
        updatedPost.UpdatedAtUtc.Should().NotBeNull();
    }

c#
[Fact]
    public async Task UpdatePost_OwnPost_ReturnsOk()
    {
        // Arrange
        var (token, userId) = await factory.AuthenticateUser("updateuser1");
        _client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

        var postId = await factory.CreateTestPost(userId, "Original Title", "Original body content");

        var updateRequest = new UpdatePost.Request(
            postId,
            "Updated Title",
            "Updated body content",
            new Uri("https://example.com/updated.jpg")
        );

        // Act
        var response = await _client.PutAsJsonAsync($"/api/posts/{postId}", updateRequest);

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var result = await response.Content.ReadFromJsonAsync<UpdatePost.Response>(_jsonOptions);

        result.Should().NotBeNull();
        result.Id.Should().Be(postId);
        result.Title.Should().Be(updateRequest.Title);

        // Verify database was updated
        using var scope = factory.Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<BlogDbContext>();
        var updatedPost = await dbContext.Posts.FindAsync(postId);
        updatedPost.Should().NotBeNull();
        updatedPost.Title.Should().Be(updateRequest.Title);
        updatedPost.Body.Should().Be(updateRequest.Body);
        updatedPost.CoverImageUrl.Should().Be(updateRequest.CoverImageUrl);
        updatedPost.UpdatedAtUtc.Should().NotBeNull();
    }