文件名清理改为固定的 Windows 非法字符集，Linux CI 现在也会将 : 替换为 -。

清除了 DOCX 测试的空引用警告，以及 3 处 xUnit Assert.Single 分析器警告。

tests/Jiaowu.Api.Tests/CourseSelectionsControllerTests.cs

@@ -110,12 +110,14 @@ public sealed class CourseSelectionsControllerTests
             .OrderBy(x => x.UserId)
             .ToListAsync();
         Assert.Equal(2, resultNotifications.Count);
-        var selectedNotification = Assert.Single(resultNotifications
-            .Where(x => x.UserId == data.EnrolledUserId));
+        var selectedNotification = Assert.Single(
+            resultNotifications,
+            x => x.UserId == data.EnrolledUserId);
         Assert.Contains("最终选中 1 门", selectedNotification.Content);
         Assert.Contains("《程序设计基础》", selectedNotification.Content);
-        var waitlistNotification = Assert.Single(resultNotifications
-            .Where(x => x.UserId == data.FirstWaiterUserId));
+        var waitlistNotification = Assert.Single(
+            resultNotifications,
+            x => x.UserId == data.FirstWaiterUserId);
         Assert.Contains("本轮未选中课程", waitlistNotification.Content);
         Assert.Contains("候补未成功 1 门", waitlistNotification.Content);
         Assert.Equal(NotificationCategory.CourseSelection, waitlistNotification.Category);

tests/Jiaowu.Api.Tests/GradeAnalysisWordReportGeneratorTests.cs

@@ -43,16 +43,19 @@ public sealed class GradeAnalysisWordReportGeneratorTests
         Assert.True(bytes.Length > 10_000);
         using var stream = new MemoryStream(bytes);
         using var document = WordprocessingDocument.Open(stream, false);
-        var text = document.MainDocumentPart!.Document.InnerText;
+        var mainDocumentPart = document.MainDocumentPart
+            ?? throw new InvalidOperationException("Generated document has no main document part.");
+        var text = mainDocumentPart.Document?.InnerText
+            ?? throw new InvalidOperationException("Generated document has no document body.");
         Assert.Contains("成绩分析报告", text);
         Assert.Contains("同课程教学班对比", text);
         Assert.Contains("各范围基准", text);
         Assert.Contains("历年成绩趋势", text);
         Assert.Contains("行政班组成", text);
         Assert.Contains("计科一班", text);
-        Assert.Equal(3, document.MainDocumentPart.ImageParts.Count());
-        Assert.Equal(2, document.MainDocumentPart.HeaderParts.Count());
-        Assert.Equal(2, document.MainDocumentPart.FooterParts.Count());
+        Assert.Equal(3, mainDocumentPart.ImageParts.Count());
+        Assert.Equal(2, mainDocumentPart.HeaderParts.Count());
+        Assert.Equal(2, mainDocumentPart.FooterParts.Count());
     }
 
     [Fact]
@@ -76,10 +79,13 @@ public sealed class GradeAnalysisWordReportGeneratorTests
         Assert.True(bytes.Length > 8_000);
         using var stream = new MemoryStream(bytes);
         using var document = WordprocessingDocument.Open(stream, false);
-        var text = document.MainDocumentPart!.Document.InnerText;
+        var mainDocumentPart = document.MainDocumentPart
+            ?? throw new InvalidOperationException("Generated document has no main document part.");
+        var text = mainDocumentPart.Document?.InnerText
+            ?? throw new InvalidOperationException("Generated document has no document body.");
         Assert.Contains("科目总体成绩分析报告", text);
         Assert.Contains("学生来源学院对比", text);
         Assert.Contains("教学班横向比较", text);
-        Assert.Single(document.MainDocumentPart.ImageParts);
+        Assert.Single(mainDocumentPart.ImageParts);
     }
 }

tests/Jiaowu.Api.Tests/OfficialDocumentTests.cs

@@ -28,8 +28,9 @@ public sealed class OfficialDocumentTests
         string parameterName)
     {
         var constructor = Assert.Single(requestType.GetConstructors());
-        var parameter = Assert.Single(constructor.GetParameters()
-            .Where(x => x.Name == parameterName));
+        var parameter = Assert.Single(
+            constructor.GetParameters(),
+            x => x.Name == parameterName);
         Assert.NotEmpty(parameter.GetCustomAttributes(typeof(ValidationAttribute), false));
 
         var property = requestType.GetProperty(parameterName);