public async void GetFolderByIdFailedDeleteFolderAsync() { // Arrange mockFolderService.Setup(service => service.Delete(It.IsAny <int>())).Throws(new CurrentEntryNotFoundException("Specified Folder not found")); FolderController controller = new FolderController(mockFolderService.Object); // Assert var ex = await Assert.ThrowsAsync <CurrentEntryNotFoundException>(() => controller.Delete(It.IsAny <int>())); Assert.Equal("Specified Folder not found", ex.Message); }