文件下载名称调优

tests/Jiaowu.Api.Tests/DownloadFileNameTests.cs

@@ -0,0 +1,20 @@
+using Jiaowu.Api.Infrastructure.Files;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class DownloadFileNameTests
+{
+    [Fact]
+    public void Export_includes_safe_context_and_a_second_precision_timestamp()
+    {
+        var name = DownloadFileName.Export("课程/名单", "xlsx", " A:B ");
+
+        Assert.Matches("^课程-名单-A-B-\\d{8}-\\d{6}\\.xlsx$", name);
+    }
+
+    [Fact]
+    public void Template_has_a_stable_descriptive_name()
+    {
+        Assert.Equal("课程库-导入模板.xlsx", DownloadFileName.Template("课程库", ".xlsx"));
+    }
+}