The Visual Studio Create Unit Tests command provides the ability to create unit test method stubs. This feature allows easy configuration of a test project, the test class, and the test method stub within it.
Availability and extensions
The Create Unit Tests menu command:
Is available in the Community, Professional, and Enterprise Editions of Visual Studio 2015 and later.
Supports only C# code that targets the .NET Framework.
Is extensible, and supports emitting tests in MSTest, MSTest V2, NUnit, xUnit format.
To get started, select a method, a type, or a namespace in the code editor in the project you want to test, open the shortcut menu, and choose Create Unit Tests. This opens the Create Unit Tests dialog where the create options for the new unit tests can be selected.
Setting unit test traits
If you plan to run these tests is part of the test automation process, you might consider having the test created in another test project (the second option in the dialog above) and setting unit test traits for the unit test. This will enable you to more easily include or exclude these specific tests as part of a continuous integration or continuous deployment pipeline. The traits are set by adding metadata to the unit test directly, as shown below.
Using third-party unit test frameworks
With Visual Studio, you can easily have unit tests created for you using any test framework. To install add other test frameworks, choose Tools | Extensions and Updates. Expand Online, Visual Studio Gallery, Tools, and choose Testing.
Test framework extensions are available in Visual Studio Marketplace:
When should I use this feature?
Use this feature whenever you need to create unit tests, but specifically when you are testing existing code that has very little or no test coverage, and no documentation. In other words, where there is limited or non-existent code specification. It effectively implements an approach similar to Smart Unit Tests that characterize the observed behavior of the code.
However, this feature is equally applicable to the situation where the developer starts by writing some code, and uses that to bootstrap the unit testing discipline. Within the flow of coding, the developer might want to quickly create a unit test method stub (with a suitable test class, and a suitable test project) for a particular piece of code.
See the blog post Creating unit test method stubs with "Create Unit Tests".
More unit testing blog posts can be found here.