In this part of the SOLID series, we're going to revisit the ISP or Interface Segregation Principle. Yep, this is a very long article. If you want an easier way of learning SOLID principles in depth, then I would recommend you taking my SOLID tutorial just for 10.99$. Interface Segregation Principle Definition Before giving a definition, I want to [...]
LSP Definition The official definition from Barbara Liskov sounds like this: “If S is a subtype of T, then objects of type T may be replaced with objects of type S, without breaking the program” – B. Liskov. It’s not very hard to grasp what this definition means but I’ll quote the definition of LSP from the book of Uncle Bob “Agile Principles, [...]
Why learn about data structures and algorithms? Algorithms and data structures constitute the fundamentals of programming. Good understanding of algorithms and data structures is one of the most important requirements for a great number of work positions. You'll have to solve many problems related to algorithms and data structures at coding interviews. Indeed, you can live without an understanding of algorithms and data structures, [...]
What is Selenium Selenium is a portable software testing framework for web applications. Basically, it automates browsers what in other words means that it simulates how human beings interact with browsers, e.g. click on buttons, select check boxes, type in some text and so on. There are two major ways of using the power of Selenium: Selenium IDE – There is Selenium IDE which, [...]
To write acceptance tests using SpecFlow, we need to properly set up the environment and a testing project. At first, we need to install a SpecFlow extension for Visual Studio. We need it because SpecFlow integrates into Visual Studio allowing us to easily format features and scenarios, generate corresponding code and other things. The installation process is straightforward. The only thing is that it will require [...]
Pyramid of Tests Basically, tests can be divided into three major groups: unit tests integration tests acceptance tests Unit tests are those tests which verify the behavior of a unit under test in isolation. That’s why when a unit under test has dependencies, we often mock them or in other words replace by special test doubles. Unit tests are great, and the majority [...]
LINQ to Entities, LINQ to Objects, LINQ to XML, Functional Programming and LINQ Extension methods were introduced in C# 3 and since then became an indispensable part of the .NET platform. That enormously powerful feature allowed to build a whole framework built upon it called LINQ or Language Integrated Query. I’ve seen many code bases which avoid using LINQ and rely on the [...]
For the last two decades, computers became faster by increasing the number of CPU cores. However, the fact of having more cores itself doesn’t make a computer drastically faster if those cores are not used by software properly. We, as software developers, should know how to write asynchronous and parallel executing code to make our applications faster and more responsive. This course is all [...]
Foundations of building object-oriented infrastructures Despite the fact that C# is a very rich on features language, it's very common to see poorly designed and implemented types in a real world. In fact, C# is one of the richest on features language among object-oriented languages in the world nowadays. But with great power comes great responsibility. It's challenging to use all those features in a right [...]
Today unit testing is the absolutely required skill which is required from any professional developer. Companies expect from developers to know how to write unit tests including all the most important topics such as mocking and test-driven development (TDD in short). This course is all about practicing TDD using C# programming language and NUnit as a unit testing framework. Along the way, we [...]
