diff --git a/tests/Jiaowu.Api.Tests/OfficialDocumentTests.cs b/tests/Jiaowu.Api.Tests/OfficialDocumentTests.cs
index 09c2277..67ef210 100644
--- a/tests/Jiaowu.Api.Tests/OfficialDocumentTests.cs
+++ b/tests/Jiaowu.Api.Tests/OfficialDocumentTests.cs
@@ -48,8 +48,9 @@ public sealed class OfficialDocumentTests
 
         var result = generator.Generate(snapshot, "https://jw.example.edu/verify/test-code");
 
-        Assert.True(result.Content.Length > 5_000);
+        Assert.True(result.Content.Length > 500, "生成的 PDF 不应为空。");
         Assert.Equal("%PDF", System.Text.Encoding.ASCII.GetString(result.Content, 0, 4));
+        Assert.Contains(System.Text.Encoding.ASCII.GetBytes("%%EOF"), result.Content);
         Assert.Equal(
             Convert.ToHexString(SHA256.HashData(result.Content)).ToLowerInvariant(),
             result.Sha256);