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Mert Özen's blog posts on software development, backend, frontend, and DevOps.

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.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Solution Patterns 22 SOLID and Design Principles 12 Clean Code 13 Design Patterns 23 UML and Modeling 18 Introduction to Software Architecture 9

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Software Design PART 10

Clean Test Code: F.I.R.S.T., Readable Asserts and Test Data Builders

A clean test is fast, independent, repeatable, self-validating and timely (F.I.R.S.T.); the legacy OrderService tests break on Saturdays because of DateTime.Now and depending on run order because of the static Db. With TimeProvider and FakeTimeProvider, a test data builder, test names that read like sentences and asserts that state the reason when they fail, we turn the same rules into clean tests.

7 Nov 2026 11 min 5