Add HTTP server startup timeouts.

com.io7m.hibiscus.tests/src/main/java/com/io7m/hibiscus/tests/examples/http0/EHTTP0Test.java

@@ -45,13 +45,17 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
 
 @Timeout(value = 5_000L, unit = TimeUnit.SECONDS)
 public final class EHTTP0Test
 {
   private static final Logger LOG =
     LoggerFactory.getLogger(EHTTP0Test.class);
 
+  private static final Duration STARTUP_TIMEOUT =
+    Duration.ofSeconds(5L);
+
   private static final int PORT = 47000;
   private static EHTTP0Server SERVER;
   private static InetSocketAddress ADDRESS;
@@ -70,7 +74,9 @@ public static void setupOnce()
     SERVER =
       new EHTTP0Server(ADDRESS);
 
-    SERVER.start();
+    assertTimeoutPreemptively(STARTUP_TIMEOUT, () -> {
+      SERVER.start();
+    });
   }
 
   @AfterAll