Builder patterns in unit tests

I like using the Builder pattern for building test data in unit tests. Builder pattern makes it clean if I need to build a valid object, in the unit tests, with the minimum required properties. It also makes it clear when I need to build an object and explicitly specify a different value for any of the properties.

Let’s say we have an entity class as followed

public class Article
{
    public Guid Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
    public DateTime PublishedDate { get; set; }
}

I would have a builder class in the unit test project as followed

public class ArticleBuilder
{
    private Guid _id;
    private string _title;
    private string _content;
    private DateTime _publishedDate;

    public ArticleBuilder()
    {
        _id = Guid.NewGuid();
        _title= "Test title";
        _content= "Test content";
        _publishedDate= DateTime.UtcNow;
    }

    public ArticleBuilder WithId(Guid id)
    {
        _id = id;
        return this;
    }

    public ArticleBuilder WithTitle(string title)
    {
        _title = title;
        return this;
    }

    public ArticleBuilder WithContent(string content)
    {
        _content = content;
        return this;
    }

    public ArticleBuilder WithPublishedDate(DateTime publishedDate)
    {
        _publishedDate = publishedDate;
        return this;
    }

    public Article Build() => new Article
    {
        Id = _id,
        Title = _title,
        Content = _content,
        PublishedDate = _publishedDate
    };
}

And this is how it’s used

// If I want the basic valid article
var simpleArticle = new ArticleBuilder().Build();

// If I want a different title
var articleWithDifferentTitle = new ArticleBuilder()
                                    .WithTitle("This is a different title")
                                    .Build();

// Or if I want to change all properties, I could chain them up
var test = new ArticleBuilder()
               .WithTitle("Test sample article title")
               .WithContent("This is a test article content")
               .WithPublishedDate(DateTime.UtcNow.AddDays(10))
               .Build();