test(unit): add lightweight vitest coverage for auth duration and seq pagination utils

Fabric.Backend.Guild/src/messaging/pagination.util.spec.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from 'vitest';
+import { clampLimit, computeNextExpectedSeq } from './pagination.util';
+
+describe('pagination utils', () => {
+  it('clamps limit safely', () => {
+    expect(clampLimit(undefined, 50, 200)).toBe(50);
+    expect(clampLimit('500', 50, 200)).toBe(200);
+    expect(clampLimit('-1', 50, 200)).toBe(50);
+  });
+
+  it('computes next expected seq', () => {
+    expect(computeNextExpectedSeq(1, [1, 2, 3])).toBe(4);
+    expect(computeNextExpectedSeq(1, [1, 3, 4])).toBe(2);
+  });
+});