diff --git a/mRemoteNGTests/Security/AeadCryptographyProviderTests.cs b/mRemoteNGTests/Security/AeadCryptographyProviderTests.cs
index 065f48d17..b74a09405 100644
--- a/mRemoteNGTests/Security/AeadCryptographyProviderTests.cs
+++ b/mRemoteNGTests/Security/AeadCryptographyProviderTests.cs
@@ -1,11 +1,11 @@
-using System;
-using System.Collections;
-using System.Security;
-using mRemoteNG.Security;
+using mRemoteNG.Security;
 using mRemoteNG.Security.Factories;
 using mRemoteNG.Security.SymmetricEncryption;
 using NUnit.Framework;
 using NUnit.Framework.Constraints;
+using System;
+using System.Collections;
+using System.Security;
 
 
 namespace mRemoteNGTests.Security
@@ -97,6 +97,12 @@ namespace mRemoteNGTests.Security
             Assert.That(cryptoProvider.CipherMode, Is.EqualTo(mode));
         }
 
+        [Test]
+        public void ProvidingEmptyEncryptionKeyThrowsException()
+        {
+            Assert.Throws<ArgumentException>(() => _cryptographyProvider.Encrypt(_plainText, new SecureString()));
+        }
+
 
         private class TestCaseSources
         {