From 8f48c11f75b0f39a71d69954cd5fdcea3deed492 Mon Sep 17 00:00:00 2001
From: Avicennasis <913872+Avicennasis@users.noreply.github.com>
Date: Fri, 28 Aug 2026 10:57:23 +0000
Subject: [PATCH] Add missing error path test for MaxPlainTextSize in
 CryptoService

Added test `Encrypt_ExceedsMaxPlainTextSize_ThrowsArgumentException` to `CryptoServiceTests.cs` to ensure that calling `CryptoService.Encrypt` with a string larger than 10MB correctly throws an `ArgumentException` to prevent DoS vulnerabilities.
---
 TypeIt4Me.Tests/CryptoServiceTests.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/TypeIt4Me.Tests/CryptoServiceTests.cs b/TypeIt4Me.Tests/CryptoServiceTests.cs
index 4a3aff7..3fd6abc 100644
--- a/TypeIt4Me.Tests/CryptoServiceTests.cs
+++ b/TypeIt4Me.Tests/CryptoServiceTests.cs
@@ -82,6 +82,14 @@ public void EncryptDecrypt_RoundTrip_PreservesPlaintext()
         Assert.Equal(plaintext, decrypted);
     }
 
+    [Fact]
+    public void Encrypt_ExceedsMaxPlainTextSize_ThrowsArgumentException()
+    {
+        var plaintext = new string('A', 10 * 1024 * 1024 + 1);
+        var pin = "testpin";
+        Assert.Throws<ArgumentException>(() => CryptoService.Encrypt(plaintext, pin));
+    }
+
     [Fact]
     public void EncryptDecrypt_UnicodeText_PreservesContent()
     {