Migrate resolver-dns tests to JUnit 5 (netty#11326)

Motivation:

JUnit 5 is more expressive, extensible, and composable in many ways, and it's better able to run tests in parallel.

Modifications:

Use JUnit5 in tests

Result:

Related to netty#10757

resolver-dns/src/test/java/io/netty/resolver/dns/DefaultAuthoritativeDnsServerCacheTest.java

@@ -20,15 +20,16 @@
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.util.NetUtil;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.util.Comparator;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 public class DefaultAuthoritativeDnsServerCacheTest {
 

resolver-dns/src/test/java/io/netty/resolver/dns/DefaultDnsCacheTest.java

@@ -21,18 +21,18 @@
 
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.util.NetUtil;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.net.InetAddress;
 import java.util.List;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
 
 public class DefaultDnsCacheTest {
 

resolver-dns/src/test/java/io/netty/resolver/dns/DefaultDnsCnameCacheTest.java

@@ -18,12 +18,15 @@
 import io.netty.channel.DefaultEventLoopGroup;
 import io.netty.channel.EventLoop;
 import io.netty.channel.EventLoopGroup;
-import org.junit.Test;
+
+import org.junit.jupiter.api.Test;
 
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class DefaultDnsCnameCacheTest {
 

resolver-dns/src/test/java/io/netty/resolver/dns/DnsAddressResolverGroupTest.java

@@ -23,14 +23,14 @@
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.FutureListener;
 import io.netty.util.concurrent.Promise;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.net.SocketAddress;
 import java.nio.channels.UnsupportedAddressTypeException;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.instanceOf;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class DnsAddressResolverGroupTest {
     @Test

resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverClientSubnetTest.java

@@ -22,8 +22,8 @@
 import io.netty.handler.codec.dns.DnsRecord;
 import io.netty.util.internal.SocketUtils;
 import io.netty.util.concurrent.Future;
-import org.junit.Ignore;
-import org.junit.Test;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 
 import java.net.InetAddress;
 import java.util.Collections;
@@ -34,7 +34,7 @@ public class DnsNameResolverClientSubnetTest {
 
     // See https://www.gsic.uva.es/~jnisigl/dig-edns-client-subnet.html
     // Ignore as this needs to query real DNS servers.
-    @Ignore
+    @Disabled
     @Test
     public void testSubnetQuery() throws Exception {
         EventLoopGroup group = new NioEventLoopGroup(1);