Unit testing concurrent code

In this section, we will adapt a sample from Chapter 9, to add unit test coverage. When your code uses async and await, adding reliable test coverage is very simple. At the end of the example, we will examine an alternative method of waiting to perform your assertions by using the SpinLock struct.

Let’s create an xUnit.net unit test project for the ConcurrentOrderQueue project and add several tests:

1. Start by copying the ConcurrentOrderQueue project from Chapter 9. You can get the source code from the GitHub repository if you do not already have a copy of it: https://github.com/PacktPublishing/Parallel-Programming-and-Concurrency-with-C-sharp-10-and-.NET-6/tree/main/chapter09/ConcurrentOrderQueue.
2. Open the ConcurrentOrderQueue solution in Visual Studio.
3. Right-click the solution file in Solution Explorer and click on Add | New Project. Add an xUnit Unit Test project named ConcurrentOrderQueue.Tests. Make sure to add the new project...