Quarkus quickstart example test - Connection refused

Beginning with Quarkus, I build the getting-started-example and it works fine. But if I run the tests with mvn test it doesn't work, I'm getting a connection refused error. The port 8081 is ok, so what's wrong with it?

[INFO] Running org.acme.quickstart.GreetingResourceTest
2020-02-20 07:55:20,150 INFO  [io.quarkus] (main) Quarkus 1.1.0.Final started in 0.080s.
2020-02-20 07:55:20,154 INFO  [io.quarkus] (main) Profile test activated.
2020-02-20 07:55:20,154 INFO  [io.quarkus] (main) Installed features: []
[ERROR] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 6.345 s <<< FAILURE! - in org.acme.quickstart.GreetingResourceTest
[ERROR] testHelloEndpoint  Time elapsed: 3.192 s  <<< ERROR!
java.net.ConnectException: Connection refused: connect
        at org.acme.quickstart.GreetingResourceTest.testHelloEndpoint(GreetingResourceTest.java:17)
[ERROR] testGreetingEndpoint  Time elapsed: 2.029 s  <<< ERROR!
java.net.ConnectException: Connection refused: connect
        at org.acme.quickstart.GreetingResourceTest.testGreetingEndpoint(GreetingResourceTest.java:23)