test: Fix tests on Java 21 or newer; replace InetAddress mocking code

Some unit tests work with fake ("mocked") InetAddress objects, which are
currently assembled via mockito. With Java 21 and newer, this is no
longer possible.

Replace the mocking code with direct calls to
InetAddress.getByAddress(String,byte[]).

Fixes #144

Signed-off-by: Christian Kohlschütter <christian@kohlschutter.com>
(cherry picked from commit 7d7a190)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

Author: kohlschuetter

core/src/test/java/org/dcache/nfs/InetAddressMatcherTest.java

@@ -19,15 +19,16 @@
  */
 package org.dcache.nfs;
 
-import java.net.UnknownHostException;
+import static com.google.common.net.InetAddresses.forString;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import java.net.InetAddress;
-import org.junit.Test;
+import java.net.UnknownHostException;
 
-import static com.google.common.net.InetAddresses.forString;
-import static org.mockito.Mockito.*;
-import static org.mockito.BDDMockito.given;
-import static org.junit.Assert.*;
 import org.junit.Ignore;
+import org.junit.Test;
 
 public class InetAddressMatcherTest {
 
@@ -162,12 +163,7 @@ public void testDomainNoMatch() throws UnknownHostException {
         assertFalse("incorrect host matched by domain", ipMatcher.match(addr));
     }
 
-    private InetAddress mockInetAddress(String  dnsName, String...ips) throws UnknownHostException {
-
-        InetAddress mockedAddress = mock(InetAddress.class);
-        given(mockedAddress.getHostName()).willReturn(dnsName);
-        given(mockedAddress.getCanonicalHostName()).willReturn(dnsName);
-
-        return mockedAddress;
+    private InetAddress mockInetAddress(String dnsName, String... ips) throws UnknownHostException {
+        return InetAddress.getByAddress(dnsName, InetAddress.getByName(ips[0]).getAddress());
     }
 }

core/src/test/java/org/dcache/testutils/InetAddressBuilder.java

@@ -1,8 +1,7 @@
 package org.dcache.testutils;
 
 import java.net.InetAddress;
-
-import org.mockito.Mockito;
+import java.net.UnknownHostException;
 
 public class InetAddressBuilder {
     private String ipAddress;
@@ -19,9 +18,10 @@ public InetAddressBuilder hostName(String hostName) {
     }
 
     public InetAddress build() {
-        InetAddress address = Mockito.mock(InetAddress.class);
-        Mockito.when(address.getHostAddress()).thenReturn(ipAddress);
-        Mockito.when(address.getHostName()).thenReturn(hostName);
-        return address;
+        try {
+            return InetAddress.getByAddress(hostName, InetAddress.getByName(ipAddress).getAddress());
+        } catch (UnknownHostException e) {
+            throw new IllegalStateException(e);
+        }
     }
 }