I will start by explaining what is a test plug-in and than I will show how to create one. Web Test Plug-in is used to do the following: Run code that you write at the beginning or at the end of each Iteration. In order to use it in the beginning and the end of each iteration you will need to override the PreWebTest and PostWebTest methods. Run code at the beginning or the end of each Request. In order to use a Web Test Plug-in in the beginning and the end of each request you will need to override...