I use VS2010. In my test project I have a folder named \"MessageInstances\" and in that folder there is a subfolder \"GET_ACTIVITY\", inside that folder there are xml files.
Per MSDN , you can also try this if this helps,
To select files or folders to deploy, in run configuration
In Solution Explorer, under Solution Items, double-click the run configuration file that you want to edit.
A dialog box that has a name such as .testrunconfig appears. Click Deployment.
Under Additional files or directories to deploy, specify additional files or folders to be copied.
To do this, click Add file to select files; this opens the Add Deployment Files dialog box.
You can also click Add Directory to select folders by using the Add Deployment Directory dialog box.
In the .testrunconfig dialog box, click Save and then click OK.
These deployment items will be copied to the deployment folder whenever this run configuration file is active.
Hope this will help.