public void Execute(IProgressMonitor progressMonitor)
        {
            using (progressMonitor.BeginTask("Removing all files.", 100))
            {
                // remove all files from test package
                using (var subProgressMonitor = progressMonitor.CreateSubProgressMonitor(50))
                    projectController.RemoveAllFiles();

                // reload
                using (var subProgressMonitor = progressMonitor.CreateSubProgressMonitor(50))
                {
                    var loadPackageCommand = new LoadPackageCommand(testController, projectController);
                    loadPackageCommand.Execute(subProgressMonitor);
                }
            }
        }