[SUREFIRE-2220] SurefireForkChannel#getForkNodeConnectionString() returns invalid URI string if localHost resolves to IPv6 address

This closes #697

Author: michael-o

maven-surefire-common/src/main/java/org/apache/maven/plugin/surefire/extensions/SurefireForkChannel.java

@@ -25,6 +25,8 @@
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.SocketOption;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.AsynchronousServerSocketChannel;
@@ -112,7 +114,19 @@ public void tryConnectToClient() {
 
     @Override
     public String getForkNodeConnectionString() {
-        return "tcp://" + localHost + ":" + localPort + (isBlank(sessionId) ? "" : "?sessionId=" + sessionId);
+        try {
+            URI uri = new URI(
+                    "tcp",
+                    null,
+                    localHost,
+                    localPort,
+                    null,
+                    isBlank(sessionId) ? null : "sessionId=" + sessionId,
+                    null);
+            return uri.toASCIIString();
+        } catch (URISyntaxException e) {
+            throw new IllegalStateException(e);
+        }
     }
 
     @Override

maven-surefire-common/src/test/java/org/apache/maven/surefire/extensions/ForkChannelTest.java

@@ -121,14 +121,16 @@ public Object getConsoleLock() {
             assertThat(channel.getCountdownCloseablePermits()).isEqualTo(3);
 
             String localHost = InetAddress.getLoopbackAddress().getHostAddress();
-            assertThat(channel.getForkNodeConnectionString())
-                    .startsWith("tcp://" + localHost + ":")
-                    .isNotEqualTo("tcp://" + localHost + ":")
-                    .endsWith("?sessionId=" + sessionId);
-
-            URI uri = new URI(channel.getForkNodeConnectionString());
-
+            String connectionString = channel.getForkNodeConnectionString();
+            URI uri = new URI(connectionString);
+            assertThat(uri.getScheme()).isEqualTo("tcp");
+            String uriHost = uri.getHost();
+            if (uriHost.startsWith("[") && uriHost.endsWith("]")) {
+                uriHost = uriHost.substring(1, uriHost.length() - 1);
+            }
+            assertThat(uriHost).isEqualTo(localHost);
             assertThat(uri.getPort()).isPositive();
+            assertThat(uri.getQuery()).isEqualTo("sessionId=" + sessionId);
 
             final TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
             TestLessInputStream commandReader = builder.build();