Skip TlsHandshakeRejectsTlsLessThan12 more and expand Assert.Throws<>()

- skip `TlsHandshakeRejectsTlsLessThan12` because TLS1.0 is not available on Ubuntu 20.04
- for the other 3 tests, `IOException` was too specific for the platform switch

Author: dougbu

src/Servers/Kestrel/test/InMemory.FunctionalTests/Http2/TlsTests.cs

@@ -30,6 +30,9 @@ public class TlsTests : LoggedTest
 
         [ConditionalFact]
         [OSSkipCondition(OperatingSystems.Windows)]
+        // Ubuntu 20.04 disables TLS1.1 by default which SslStream requires in this scenario.
+        // For now, we test only on macOS because we don't have checks for the specific Linux version.
+        [OSSkipCondition(OperatingSystems.Linux)]
         public async Task TlsHandshakeRejectsTlsLessThan12()
         {
             using (var server = new TestServer(context =>

src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsConnectionMiddlewareTests.cs

@@ -384,7 +384,7 @@ void ConfigureListenOptions(ListenOptions listenOptions)
                 using (var connection = server.CreateConnection())
                 {
                     var stream = OpenSslStreamWithCert(connection.Stream);
-                    var ex = await Assert.ThrowsAsync<IOException>(
+                    var ex = await Assert.ThrowsAnyAsync<Exception>(
                         async () => await stream.AuthenticateAsClientAsync("localhost", new X509CertificateCollection(), SslProtocols.Tls, false));
                 }
             }

src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsTests.cs

@@ -372,7 +372,7 @@ public async Task ClientAttemptingToUseUnsupportedProtocolIsLoggedAsDebug()
                 using (var sslStream = new SslStream(connection.Stream, true, (sender, certificate, chain, errors) => true))
                 {
                     // SslProtocols.Tls is TLS 1.0 which isn't supported by Kestrel by default.
-                    await Assert.ThrowsAsync<IOException>(() =>
+                    await Assert.ThrowsAnyAsync<Exception>(() =>
                         sslStream.AuthenticateAsClientAsync("127.0.0.1", clientCertificates: null,
                             enabledSslProtocols: SslProtocols.Tls,
                             checkCertificateRevocation: false));
@@ -402,7 +402,7 @@ public async Task DevCertWithInvalidPrivateKeyProducesCustomWarning()
                 using (var sslStream = new SslStream(connection.Stream, true, (sender, certificate, chain, errors) => true))
                 {
                     // SslProtocols.Tls is TLS 1.0 which isn't supported by Kestrel by default.
-                    await Assert.ThrowsAsync<IOException>(() =>
+                    await Assert.ThrowsAnyAsync<Exception>(() =>
                         sslStream.AuthenticateAsClientAsync("127.0.0.1", clientCertificates: null,
                             enabledSslProtocols: SslProtocols.Tls,
                             checkCertificateRevocation: false));