Writing Testable Code: Common Anti-Patterns and How to Fix Them

📰 Dev.to · Mark Adel

Learn to identify and fix common anti-patterns in code design to make it more testable and maintainable

intermediate Published 26 Apr 2026
Action Steps
  1. Identify tightly coupled code and refactor it to loosen dependencies
  2. Use dependency injection to make code more modular and testable
  3. Avoid using static methods and variables that can make code hard to test
  4. Apply the Single Responsibility Principle to ensure each module has a single, well-defined responsibility
  5. Use mocking libraries to isolate dependencies and make code more testable
Who Needs to Know This

Software engineers and developers can benefit from this knowledge to improve their coding practices and make their code more testable, which in turn helps the QA team to write effective tests

Key Insight

💡 Code that is hard to test is usually a design problem, not a testing problem

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🚨 Make your code more testable by avoiding common anti-patterns! 💡

Key Takeaways

Learn to identify and fix common anti-patterns in code design to make it more testable and maintainable

Full Article

When code is hard to test, it is usually a design problem, not a testing problem. Code becomes...
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