Fix AFVSOCKSocketAddress.toSocatAddressString test

AFSocketAddress.toSocatAddressString may throw a SocketException if the
address is not natively supported on the target system. The unit test
didn't catch that.

junixsocket-common/src/test/java/org/newsclub/net/unix/AFVSOCKSocketAddressTest.java

@@ -18,7 +18,7 @@
 package org.newsclub.net.unix;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -96,12 +96,19 @@ public void testNamedCIDs() throws Exception {
 
   @Test
   public void testSocatString() throws Exception {
-    String socatString = AFVSOCKSocketAddress.ofPortAndCID(123, 4).toSocatAddressString(
-        AFSocketType.SOCK_STREAM, AFSocketProtocol.DEFAULT);
-    if (socatString == null) {
-      assertFalse(AFSocket.supports(AFSocketCapability.CAPABILITY_VSOCK));
-    } else {
-      assertTrue(socatString.contains(":"));
+    String socatString;
+    try {
+      socatString = AFVSOCKSocketAddress.ofPortAndCID(123, 4).toSocatAddressString(
+          AFSocketType.SOCK_STREAM, AFSocketProtocol.DEFAULT);
+      assertNotNull(socatString);
+    } catch (SocketException e) {
+      if (AFSocket.supports(AFSocketCapability.CAPABILITY_VSOCK)) {
+        throw e;
+      } else {
+        // expected
+        return;
+      }
     }
+    assertTrue(socatString.contains(":"));
   }
 }