test(playwright): Site Calls keyset pagination edge case (Wave 4)

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/SiteCalls/SiteCallsPageTests.cs

@@ -491,4 +491,89 @@ public class SiteCallsPageTests
             page.GetByText("No cached calls match the current filters."))
             .ToBeVisibleAsync();
     }
+
+    /// <summary>
+    /// Keyset pagination traverses forward (Next) and back (Previous) across a
+    /// full page boundary. The grid pages at 50 rows ordered
+    /// <c>CreatedAtUtc DESC, TrackedOperationId DESC</c>; the Next button is
+    /// enabled only when the current page came back exactly full (50 rows), so a
+    /// short page (1 row) is the last page.
+    /// <para>
+    /// <c>Target</c> is an exact match, so seeding 51 rows that all share ONE
+    /// identical target string lets a single <c>#sc-search</c> keyword select all
+    /// 51 → page 1 = 50 rows, page 2 = 1 row. Staggering <c>createdAtUtc</c> by
+    /// the loop index makes the keyset order strict and deterministic. Every row
+    /// uses the permitted source site <c>site-a</c> so
+    /// <c>FilterPermittedAsync</c> keeps them.
+    /// </para>
+    /// <para>
+    /// Web-first only: each page-transition assertion checks the row COUNT first
+    /// (which waits for the keyset fetch to render) BEFORE the pager button
+    /// states, because the <c>_loading</c> flag also disables both buttons
+    /// mid-fetch — reading button state before the fetch settles would race.
+    /// </para>
+    /// </summary>
+    [SkippableFact]
+    public async Task Pagination_KeysetNextAndPrev_TraversesPages()
+    {
+        Skip.IfNot(await SiteCallDataSeeder.IsAvailableAsync(), DbUnavailableSkipReason);
+
+        var runId = Guid.NewGuid().ToString("N");
+        var prefix = $"playwright-test/wave4-scpage/{runId}/";
+        // All 51 rows share ONE identical exact target — a single keyword selects
+        // the whole set, which then spans the 50-row page boundary.
+        var sharedTarget = prefix + "row";
+
+        try
+        {
+            // 51 rows, identical target, distinct TrackedOperationId, all site-a /
+            // Delivered, timestamps staggered by index so the keyset order
+            // (CreatedAtUtc DESC, TrackedOperationId DESC) is strict.
+            var now = DateTime.UtcNow;
+            for (int i = 0; i < 51; i++)
+            {
+                var ts = now.AddSeconds(-i);
+                await SiteCallDataSeeder.InsertSiteCallAsync(
+                    trackedOperationId: Guid.NewGuid(), channel: "ApiOutbound", target: sharedTarget,
+                    sourceSite: "site-a", status: "Delivered", retryCount: 0,
+                    createdAtUtc: ts, updatedAtUtc: ts);
+            }
+
+            var page = await _fixture.NewAuthenticatedPageAsync();
+            await page.GotoAsync($"{PlaywrightFixture.BaseUrl}{SiteCallsUrl}");
+            await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
+
+            await SetSearchKeywordAsync(page, sharedTarget);
+            await page.ClickAsync("[data-test='site-calls-query']");
+
+            // The pager indicator span (`Page {N} · {rows} rows`). It is the only
+            // text-muted small span in the table footer, so a scoped GetByText
+            // regex is unambiguous.
+            var pageIndicator = page.Locator("span.text-muted.small");
+
+            // ── Page 1: full page (50 rows). Assert COUNT first (waits for the
+            // fetch), then the indicator and the button states. ──
+            await Assertions.Expect(page.Locator("tbody tr")).ToHaveCountAsync(50);
+            await Assertions.Expect(pageIndicator).ToContainTextAsync("Page 1");
+            await Assertions.Expect(page.Locator("[data-test='site-calls-prev']")).ToBeDisabledAsync();
+            await Assertions.Expect(page.Locator("[data-test='site-calls-next']")).ToBeEnabledAsync();
+
+            // ── Next → Page 2: short page (1 row). Last page, so Next disables. ──
+            await page.ClickAsync("[data-test='site-calls-next']");
+            await Assertions.Expect(page.Locator("tbody tr")).ToHaveCountAsync(1);
+            await Assertions.Expect(pageIndicator).ToContainTextAsync("Page 2");
+            await Assertions.Expect(page.Locator("[data-test='site-calls-prev']")).ToBeEnabledAsync();
+            await Assertions.Expect(page.Locator("[data-test='site-calls-next']")).ToBeDisabledAsync();
+
+            // ── Previous → back on Page 1: full page again, Prev disables. ──
+            await page.ClickAsync("[data-test='site-calls-prev']");
+            await Assertions.Expect(page.Locator("tbody tr")).ToHaveCountAsync(50);
+            await Assertions.Expect(pageIndicator).ToContainTextAsync("Page 1");
+            await Assertions.Expect(page.Locator("[data-test='site-calls-prev']")).ToBeDisabledAsync();
+        }
+        finally
+        {
+            await SiteCallDataSeeder.DeleteByTargetPrefixAsync(prefix);
+        }
+    }
 }