Unit Testing – Setup pattern (Moq)

Frank Code

In my previous post I mentioned that large unit test setups can be difficult to maintain / understand. This problem can be reduced by following a test pattern. I want to share with you a pattern I use, and I think works really well. In this post I will be using C#, Moq libary and Visual Studio test tools.

To start here are some things I believe make a good suite of unit tests:

• Easy to identify data dependencies of tests.
• Mocking is not repeated every test.
• Test are clear and easy to understand / maintain.
• New tests can be added with relative ease.

In order to explain this testing pattern I have forked my buddies TodoMVC app, and introduced a service layer, repository pattern and test project. You can see my source code with an example test class on github.

The TodoModule (service layer) has a number of public methods; Get…

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Object Oriented, Test Driven Design in C# and Java: A Practical Example Part #1

Download the code in C#

For a brief overview, please refer to this post.

At this point, many tutorials start by launching into a “Hello, World” style tutorial, with very little practical basis.

This isn’t the most exciting concept, so let’s try a more practical example. Instead of churning out boring pleasantries, our application is going to do something a bit more interesting…build robots.

Specifically, our application is going to build awesome robots with big guns.

Ok, let’s get started with a narrative description of what we’re going to do.

“Mechs with Big Guns” is a factory that produces large, robotic vehicles designed to shoot other large, robotic vehicles. Robots are composed of several robotic parts, delivered by suppliers. Parts are loaded into a delivery bay, and are transported by worker drones to various rooms; functional parts such as arms, legs, etc., are dispatched to an assembly room. Guns…

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WCF Policy – Part 8: Making the Information Available on the Client

AJ's blog

Our policy has its default behavior. All the information is collected, it just is not available to the developer yet. So let’s take care of that.

We already have the basics covered, namely we have an interface ITrackingInformation through which the application developer should have access to the information. All we need to do is to build a bridge between message inspectors and the application code.

On the client the application developer uses the generated client proxy class, thus we need to pass in the tracking information to that object. The class derives from ClientBase<TChannel> and thus inherits the property Endpointof type ServiceEndpoint. This class in turn maintains a collection of endpoint behaviors. With a custom behavior which implements our interface, the developer has the gate to our policy. Going one step further, this behavior can also register a message inspector in IEndpointBehavior.ApplyClientBehavior, which utilizes…

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SOLID principle

Chanmingman's Blog

There is a lot of debate on SOLID principle.

The video Applying SOLID Principles in .NET   (http://channel9.msdn.com/events/TechEd/Europe/2014/DEV-B210) is worth to watch.

I like the last slide Consideration

As he mentioned.

1. Someone just over engineering using the term SOLID

2. How readable for your Dependency Injection if you have large set of object.

3. When talking about maintainable, before SOLID is 50 lines of code, after SOLID is 230 lines of code previewing the same functionality. So you think 50 lines of code is easier to maintain or 230?

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Developer – 3 Tips Every SQL Expert Needs to Know to Land the Perfect Job (Part 3 of 3)

Clean event handler invocation with C# 6

Jon Skeet's coding blog

The problem

Invoking event handlers in C# has always been a bit of a pain, because an event with no subscribers is usually represented as a null reference. This leads to code like this:

It’s important to use the handler local variable, as if instead you access the field twice, it’s possible that the last subscriber will unsubscribe between the check and the invocation:

Now this can be simplified slightly using an extension method:

Then in each event, you can write a single line:

However, this means having a different extension method for each delegate type. It’s not too bad if you’re using EventHandler but it’s still not ideal.

C# 6 to the rescue!

The null-conditional operator (?.) in C# 6 isn’t just for properties. It can also be used for method calls. The compiler does the right thing (evaluating the expression only once) so you can do…

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SQL SERVER – 8 Performance Related Articles on Logical Reads