Disable FQDN test on misconfigured hosts

Author: ppkarwasz

log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/NetUtilsTest.java

@@ -17,11 +17,14 @@
 package org.apache.logging.log4j.core.util;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assumptions.assumeThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.io.File;
+import java.net.InetAddress;
 import java.net.URI;
+import java.net.UnknownHostException;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
@@ -73,7 +76,8 @@ public void testToUriWindowsAbsolutePath() {
     }
 
     @Test
-    public void testCanonicalHostName() {
+    public void testCanonicalHostName() throws UnknownHostException {
+        assumeThat(InetAddress.getLocalHost().getCanonicalHostName()).contains(".");
         // If this fails the host might be misconfigured
         assertThat(NetUtils.getCanonicalLocalHostname()).contains(".");
     }