Either download from the extension manager by searching OpenWithTest or go to the project page here.
Open with Test is a Visual Studio extension which serves one simple task: To always open your test files and implementation files together.
When writing unit tested applications (especially while practicing TDD) you will often open an implementation file (i.e SomeClass.cs) followed by the test file(i.e. SomeClassTests.cs). This extension makes this a one step process.
It works by detecting when you open a new file and attempting to find via convention the test file. It assumes that you create one test file per class. So, if you create a class called Car in the file Car.cs then you will have a test file named CarTests.cs which tests the car class.
Currently, only C# (.cs) files are supported but I plan to expand this to other files types soon.
Out of the box, this extension will assume a file is a test file if it ends with the suffix Test,Tests, Fact or Facts. However, this can be configured. To change these go to Tools -> Options -> Open With Test and you will see this screen:
I would love to get feedback about features or suggestion so please feel free to leave a comment on this blog post or start a discussion post on the Visual Studio Gallery page.