test: assert Trend panel renders on full repo page

internal/server/http/ui_repo_trend_test.go

@@ -87,3 +87,37 @@ func TestUIRepoTrend_InvalidRangeFallsBackTo30d(t *testing.T) {
 		t.Errorf("expected data-range=30d on invalid range fallback")
 	}
 }
+
+// TestUIRepoPageRendersTrendPanel — full-page render path: seed 3
+// history rows, fetch /hosts/{id}/repo, assert the Trend panel with
+// SVG chart ID, class, and heading text appear embedded in the page.
+func TestUIRepoPageRendersTrendPanel(t *testing.T) {
+	t.Parallel()
+	_, baseURL, st := newTestServerWithUI(t)
+	cookie := loginAsAdmin(t, st)
+	hostID := makeHost(t, st, "h-trend-page")
+	ctx := context.Background()
+
+	now := time.Now().UTC()
+	for i := 0; i < 3; i++ {
+		day := now.AddDate(0, 0, -i).Format("2006-01-02")
+		v := int64(2000 + i*200)
+		c := int64(20 + i)
+		if err := st.UpsertHostRepoStatsHistory(ctx, hostID, day,
+			store.HostRepoStats{TotalSizeBytes: &v, SnapshotCount: &c}, now); err != nil {
+			t.Fatalf("seed %s: %v", day, err)
+		}
+	}
+
+	body := getRepoPage(t, baseURL, hostID, cookie)
+
+	if !strings.Contains(body, `id="repo-trend-chart"`) {
+		t.Errorf("expected id=\"repo-trend-chart\" in full-page render")
+	}
+	if !strings.Contains(body, `class="repo-trend-chart"`) {
+		t.Errorf("expected class=\"repo-trend-chart\" in full-page render")
+	}
+	if !strings.Contains(body, ">Trend<") {
+		t.Errorf("expected panel heading '>Trend<' in full-page render")
+	}
+}