diff --git a/src/SignalR/common/SignalR.Common/test/Internal/Protocol/HandshakeProtocolTests.cs b/src/SignalR/common/SignalR.Common/test/Internal/Protocol/HandshakeProtocolTests.cs
index 27560c502a6b..9a88d32a5794 100644
--- a/src/SignalR/common/SignalR.Common/test/Internal/Protocol/HandshakeProtocolTests.cs
+++ b/src/SignalR/common/SignalR.Common/test/Internal/Protocol/HandshakeProtocolTests.cs
@@ -15,6 +15,12 @@ public class HandshakeProtocolTests
         [InlineData("{\"protocol\":\"dummy\",\"version\":1}\u001e", "dummy", 1)]
         [InlineData("{\"protocol\":\"\",\"version\":10}\u001e", "", 10)]
         [InlineData("{\"protocol\":\"\",\"version\":10,\"unknown\":null}\u001e", "", 10)]
+        [InlineData("{\"protocol\":\"firstProtocol\",\"protocol\":\"secondProtocol\",\"version\":1}\u001e", "secondProtocol", 1)]
+        [InlineData("{\"protocol\":\"firstProtocol\",\"protocol\":\"secondProtocol\",\"version\":1,\"version\":75}\u001e", "secondProtocol", 75)]
+        [InlineData("{\"protocol\":\"dummy\",\"version\":1,\"ignoredField\":99}\u001e", "dummy", 1)]
+        [InlineData("{\"protocol\":\"dummy\",\"version\":1}{\"protocol\":\"wrong\",\"version\":99}\u001e", "dummy", 1)]
+        [InlineData("{\"protocol\":\"\\u0064ummy\",\"version\":1}\u001e", "dummy", 1)]
+        [InlineData("{\"\\u0070rotoco\\u006c\":\"\\u0064ummy\",\"version\":1}\u001e", "dummy", 1)]
         public void ParsingHandshakeRequestMessageSuccessForValidMessages(string json, string protocol, int version)
         {
             var message = new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(json));