Test TLS 1.3 only if available

TLS 1.3 has not been backported to all Java version (e.g. on 9 and 10),
so this commit checks if the protocol is available before
running the test.

References #715

Author: acogoluegnes

src/test/java/com/rabbitmq/client/test/ssl/NioTlsUnverifiedConnection.java

@@ -19,7 +19,10 @@
 import com.rabbitmq.client.impl.nio.NioParams;
 import com.rabbitmq.client.test.BrokerTestCase;
 import com.rabbitmq.client.test.TestUtils;
+import java.util.Collection;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManager;
 import org.junit.Test;
@@ -84,7 +87,10 @@ public void connectionGetConsume() throws Exception {
 
     @Test
     public void connectionGetConsumeProtocols() throws Exception {
-        String [] protocols = new String[] {"TLSv1.2", "TLSv1.3"};
+        Collection<String> availableProtocols = TlsTestUtils.availableTlsProtocols();
+        Collection<String> protocols = Stream.of("TLSv1.2", "TLSv1.3")
+           .filter(p -> availableProtocols.contains(p))
+           .collect(Collectors.toList());
         for (String protocol : protocols) {
             SSLContext sslContext = SSLContext.getInstance(protocol);
             sslContext.init(null, new TrustManager[] {new TrustEverythingTrustManager()}, null);

src/test/java/com/rabbitmq/client/test/ssl/TlsTestUtils.java

@@ -21,6 +21,8 @@
 import java.security.KeyStore;
 import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
+import java.util.Collection;
+import java.util.stream.Collectors;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManagerFactory;
@@ -107,6 +109,16 @@ public static SSLContext getSSLContext() throws NoSuchAlgorithmException {
     throw new NoSuchAlgorithmException();
   }
 
+  static Collection<String> availableTlsProtocols() {
+    try {
+      String[] protocols = SSLContext.getDefault().getSupportedSSLParameters().getProtocols();
+      return Arrays.stream(protocols).filter(p -> p.toLowerCase().startsWith("tls")).collect(
+          Collectors.toList());
+    } catch (NoSuchAlgorithmException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
   @FunctionalInterface
   interface CallableSupplier <T> {
 

src/test/java/com/rabbitmq/client/test/ssl/VerifiedConnection.java

@@ -22,12 +22,15 @@
 import com.rabbitmq.client.Connection;
 import com.rabbitmq.client.impl.nio.NioParams;
 import java.io.IOException;
+import java.util.Collection;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLSocket;
 
@@ -69,7 +72,10 @@ public void openConnection()
 
     @Test
     public void connectionGetConsumeProtocols() throws Exception {
-        String [] protocols = new String[] {"TLSv1.2", "TLSv1.3"};
+        Collection<String> availableProtocols = TlsTestUtils.availableTlsProtocols();
+        Collection<String> protocols = Stream.of("TLSv1.2", "TLSv1.3")
+            .filter(p -> availableProtocols.contains(p))
+            .collect(Collectors.toList());
         for (String protocol : protocols) {
             SSLContext sslContext = SSLContext.getInstance(protocol);
             ConnectionFactory cf = TestUtils.connectionFactory();