public void Get()
{
IHelloWorldBO helloWorldBO = new HelloWorldBO();
// controller instance
HelloWorldController controller = new HelloWorldController(helloWorldBO);
// call ReturnHelloWorld() method
IHttpActionResult actionResult = controller.ReturnHelloWorld();
// validate test
var conNegResult = actionResult as OkNegotiatedContentResult <string>;
Assert.IsNotNull(conNegResult);
Assert.AreEqual("Hello World", conNegResult.Content);
}