./gradlew test
results in
➜ udp-broadcast-reproducer git:(master) gradle test
> Task :test
AppTest > testUdpListensNullInterface(Vertx, VertxTestContext) FAILED
java.util.concurrent.TimeoutException at VertxExtension.java:230
AppTest > [1] 0 FAILED
java.util.concurrent.TimeoutException at VertxExtension.java:230
27 tests completed, 2 failed
> Task :test FAILED
FAILURE: Build failed with an exception.