Including SslProtocols in ConfigurationOptions.ToString() (#1408)

* Including SslProtocols in ConfigurationOptions.ToString()

* Removing an unnecessary method and making the code concise (based on code review comments)
Co-authored-by: Sampath Vuyyuru <sampath.vuyyuru@kincentric.com>

src/StackExchange.Redis/ConfigurationOptions.cs

@@ -509,6 +509,7 @@ public string ToString(bool includePassword)
             Append(sb, OptionKeys.TieBreaker, tieBreaker);
             Append(sb, OptionKeys.WriteBuffer, writeBuffer);
             Append(sb, OptionKeys.Ssl, ssl);
+            Append(sb, OptionKeys.SslProtocols, SslProtocols?.ToString().Replace(',', '|'));
             Append(sb, OptionKeys.SslHost, sslHost);
             Append(sb, OptionKeys.HighPrioritySocketThreads, highPrioritySocketThreads);
             Append(sb, OptionKeys.ConfigChannel, configChannel);

tests/StackExchange.Redis.Tests/SSL.cs

@@ -7,6 +7,7 @@
 using System.Net;
 using System.Net.Security;
 using System.Reflection;
+using System.Security.Authentication;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading.Tasks;
 using StackExchange.Redis.Tests.Helpers;
@@ -459,5 +460,26 @@ public void SSLParseViaConfig_Issue883_ConfigString()
                 conn.GetDatabase().Ping();
             }
         }
+
+        [Fact]
+        public void ConfigObject_Issue1407_ToStringIncludesSslProtocols()
+        {
+            var sslProtocols = SslProtocols.Tls12 | SslProtocols.Tls;
+            var sourceOptions = new ConfigurationOptions
+            {
+                AbortOnConnectFail = false,
+                Ssl = true,
+                SslProtocols = sslProtocols,
+                ConnectRetry = 3,
+                ConnectTimeout = 5000,
+                SyncTimeout = 5000,
+                DefaultDatabase = 0,
+                EndPoints = { { "endpoint.test", 6380 } },
+                Password = "123456"
+            };
+
+            var targetOptions = ConfigurationOptions.Parse(sourceOptions.ToString());
+            Assert.Equal(sourceOptions.SslProtocols, targetOptions.SslProtocols);
+        }
     }
 }