服务器端分页优化

tests/Jiaowu.Api.Tests/ApprovalsControllerTests.cs

@@ -1,4 +1,5 @@
 using Jiaowu.Api.Controllers;
+using Jiaowu.Api.Contracts;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
@@ -11,6 +12,40 @@ namespace Jiaowu.Api.Tests;
 
 public sealed class ApprovalsControllerTests
 {
+    [Fact]
+    public async Task Pending_returns_a_single_server_page_with_total()
+    {
+        await using var fixture = await ApprovalFixture.CreateAsync();
+        fixture.Db.AddRange(
+            new DeferredExam
+            {
+                StudentId = fixture.Student.Id,
+                TeachingTaskId = fixture.CurrentTask.Id,
+                Reason = "较早提交",
+                SubmittedAt = DateTime.UtcNow.AddMinutes(-2)
+            },
+            new CourseExemption
+            {
+                StudentId = fixture.Student.Id,
+                TeachingTaskId = fixture.CurrentTask.Id,
+                Reason = "较晚提交",
+                SubmittedAt = DateTime.UtcNow.AddMinutes(-1)
+            });
+        await fixture.Db.SaveChangesAsync();
+
+        var controller = new ApprovalsController(
+            fixture.Db,
+            new ManagerDataScope());
+        var result = await controller.GetPending(2, 1, CancellationToken.None);
+
+        var ok = Assert.IsType<OkObjectResult>(result.Result);
+        var page = Assert.IsType<PagedResult<ApprovalItem>>(ok.Value);
+        Assert.Equal(2, page.Total);
+        Assert.Equal(2, page.Page);
+        var item = Assert.Single(page.Items);
+        Assert.Equal("较早提交", item.Desc);
+    }
+
     [Fact]
     public async Task MyCourses_IncludesPublishedScheduledTaskAfterCurrentTermChanges()
     {
@@ -298,4 +333,14 @@ public sealed class ApprovalsControllerTests
             DataScope.Self,
             new HashSet<string>([SystemRoles.Student]));
     }
+
+    private sealed class ManagerDataScope : ICurrentUserDataScope
+    {
+        public CurrentUserScope Current { get; } = new(
+            Guid.NewGuid(),
+            "测试管理员",
+            null,
+            DataScope.All,
+            new HashSet<string>([SystemRoles.SuperAdmin]));
+    }
 }