diff --git a/Thirdweb.Tests/Thirdweb.SmartAccount.Tests.cs b/Thirdweb.Tests/Thirdweb.SmartAccount.Tests.cs
index 54cde86..14f01e2 100644
--- a/Thirdweb.Tests/Thirdweb.SmartAccount.Tests.cs
+++ b/Thirdweb.Tests/Thirdweb.SmartAccount.Tests.cs
@@ -141,6 +141,17 @@ public async Task GetAddress_WithOverride()
         Assert.NotNull(sig);
     }
 
+    [Fact]
+    public async Task IsValidSiganture_Invalid()
+    {
+        var account = await GetSmartAccount();
+        var sig = await account.PersonalSign("Hello, world!");
+        Assert.NotNull(sig);
+        sig += "1";
+        var res = await account.IsValidSignature("Hello, world!", sig);
+        Assert.False(res);
+    }
+
     [Fact]
     public async Task CreateSessionKey()
     {
diff --git a/Thirdweb.Tests/Thirdweb.Wallets.Tests.cs b/Thirdweb.Tests/Thirdweb.Wallets.Tests.cs
index dce9dde..28a79ef 100644
--- a/Thirdweb.Tests/Thirdweb.Wallets.Tests.cs
+++ b/Thirdweb.Tests/Thirdweb.Wallets.Tests.cs
@@ -32,6 +32,15 @@ public async Task EthSign()
         Assert.NotNull(signature);
     }
 
+    [Fact]
+    public async Task PersonalSignRaw()
+    {
+        var wallet = await GetAccount();
+        var message = "Hello, world!";
+        var signature = await wallet.PersonalSign(System.Text.Encoding.UTF8.GetBytes(message));
+        Assert.NotNull(signature);
+    }
+
     [Fact]
     public async Task PersonalSign()
     {