add SupportsTls11 and SupportsTls12 to PlatformDetection avoid OS versions in tests (#39482)

* add SupportsTls11 and SupportsTls12 to avoid OS versions in tests

* feedback from review

* fix condition

Author: wfurt

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs

@@ -125,6 +125,9 @@ public static bool IsNonZeroLowerBoundArraySupported
 
         public static bool SupportsClientAlpn => SupportsAlpn || IsOSX || IsiOS || IstvOS;
 
+        // TLS 1.1 and 1.2 can work on Windows7 but it is not enabled by default.
+        public static bool SupportsTls11 => !IsWindows7 && !IsDebian10;
+        public static bool SupportsTls12 => !IsWindows7;
         // OpenSSL 1.1.1 and above.
         public static bool SupportsTls13 => GetTls13Support();
 

src/libraries/System.Net.Security/tests/FunctionalTests/ServerAsyncAuthenticateTest.cs

@@ -23,8 +23,6 @@ public class ServerAsyncAuthenticateTest : IDisposable
         private readonly ITestOutputHelper _logVerbose;
         private readonly X509Certificate2 _serverCertificate;
 
-        public static bool IsNotWindows7 => !PlatformDetection.IsWindows7;
-
         public ServerAsyncAuthenticateTest(ITestOutputHelper output)
         {
             _log = output;
@@ -99,9 +97,8 @@ public async Task ServerAsyncAuthenticate_SimpleSniOptions_Success()
             }
         }
 
-        [ConditionalTheory(nameof(IsNotWindows7))]
-        [InlineData(SslProtocols.Tls11)]
-        [InlineData(SslProtocols.Tls12)]
+        [Theory]
+        [MemberData(nameof(SupportedProtocolData))]
         public async Task ServerAsyncAuthenticate_SniSetVersion_Success(SslProtocols version)
         {
             var serverOptions = new SslServerAuthenticationOptions() { ServerCertificate = _serverCertificate, EnabledSslProtocols = version };
@@ -247,6 +244,18 @@ public static IEnumerable<object[]> ProtocolMismatchData()
             yield return new object[] { SslProtocols.Tls12, SslProtocols.Tls11, typeof(AuthenticationException) };
         }
 
+        public static IEnumerable<Object[]> SupportedProtocolData()
+        {
+            if (PlatformDetection.SupportsTls11)
+            {
+                yield return new object[] { SslProtocols.Tls11 };
+            }
+
+            if (PlatformDetection.SupportsTls12)
+            {
+                yield return new object[] { SslProtocols.Tls12 };
+            }
+        }
         #region Helpers
 
         private async Task ServerAsyncSslHelper(