public async Task DeleteDraft()
        {
            var siteId = await MakeSite().ConfigureAwait(false);

            using var api = CreateApi();
            MyPage page = await MyPage.CreateAsync(api).ConfigureAwait(false);

            page.SiteId    = siteId;
            page.Title     = "Startpage";
            page.Text      = "Welcome";
            page.IsHidden  = true;
            page.Published = DateTime.Now;
            await PageRepository.Save(page).ConfigureAwait(false);

            await PageRepository.SaveDraft(page).ConfigureAwait(false);

            var draftId = page.Id;
            await PageRepository.DeleteDraft(draftId).ConfigureAwait(false);

            var retrieved = await PageRepository.GetDraftById <MyPage>(draftId).ConfigureAwait(false);

            Assert.IsNull(retrieved);
        }