public async Task ThrowApplicationException_WhenTournamentsIsNull()
        {
            // Arrange
            Mock <ITournamentService> tournamentServiceMock = new Mock <ITournamentService>();
            Mock <IPDFService>        pDFServiceMock        = new Mock <IPDFService>();
            Mock <IMemoryCache>       memoryCacheMock       = new Mock <IMemoryCache>();

            string validSortOrder  = string.Empty;
            string validFilter     = string.Empty;
            int    validPageNumber = 1;
            int    validPageSize   = 10;

            IPagedList <Tournament> tournaments = null;

            tournamentServiceMock.Setup(mock => mock.FilterTournamentsAsync(validSortOrder, validFilter, validPageNumber, validPageSize))
            .Returns(Task.FromResult(tournaments));

            TournamentController SUT = new TournamentController(
                tournamentServiceMock.Object,
                pDFServiceMock.Object,
                memoryCacheMock.Object);

            // Act & Assert
            await Assert.ThrowsExceptionAsync <ApplicationException>(() =>
                                                                     SUT.Download(validSortOrder, validFilter, validPageNumber, validPageSize));
        }
        public async Task CallFilterTournamentsAsync_WhenCalled()
        {
            // Arrange
            Mock <ITournamentService> tournamentServiceMock = new Mock <ITournamentService>();
            Mock <IPDFService>        pDFServiceMock        = new Mock <IPDFService>();
            Mock <IMemoryCache>       memoryCacheMock       = new Mock <IMemoryCache>();

            IList <string> validFileParameters = typeof(ChampionDownloadViewModel).GetProperties().Select(p => p.Name.ToString()).ToList();
            string         validCollection     = "champions";

            string validSortOrder  = string.Empty;
            string validFilter     = string.Empty;
            int    validPageNumber = 1;
            int    validPageSize   = 10;

            string validFileName = string.Empty;

            byte[] validFileBytes = new byte[0];

            IPagedList <Tournament> tournaments = new PagedList <Tournament>(
                new List <Tournament>().AsQueryable(),
                validPageNumber,
                validPageSize);

            IPagedList <TournamentDownloadViewModel> tournamentDownloadViewModels = new PagedList <TournamentDownloadViewModel>(
                new List <TournamentDownloadViewModel>().AsQueryable(),
                validPageNumber,
                validPageSize);

            tournamentServiceMock.Setup(mock => mock.FilterTournamentsAsync(validSortOrder, validFilter, validPageNumber, validPageSize))
            .Returns(Task.FromResult(tournaments));

            pDFServiceMock
            .Setup(mock => mock.CreatePDF(tournamentDownloadViewModels, validFileParameters, validCollection))
            .Returns(validFileName);

            pDFServiceMock
            .Setup(mock => mock.GetFileBytesAsync(validFileName))
            .Returns(Task.FromResult(validFileBytes));

            pDFServiceMock
            .Setup(mock => mock.DeleteFile(validFileName));

            TournamentController SUT = new TournamentController(
                tournamentServiceMock.Object,
                pDFServiceMock.Object,
                memoryCacheMock.Object);

            // Act
            await SUT.Download(validSortOrder, validFilter, validPageNumber, validPageSize);

            // Assert
            tournamentServiceMock.Verify(mock =>
                                         mock.FilterTournamentsAsync(validSortOrder, validFilter, validPageNumber, validPageSize),
                                         Times.Once);
        }