Quarkus Reactive testing with database operation leading to java.lang.IllegalStateException: No current Vertx context found

Question

I'm trying to test a part of my code that does a database transaction.

@QuarkusTest
class FileServiceTest {

    @InjectSpy
    MyService myService;

    @Test
    void testDatabaseOperation() {
        myService.doSomeDatabaseOperation()
                .invoke(i -> Assertions.assertEquals(0, i.size()))
                .subscribe().withSubscriber(UniAssertSubscriber.create())
                .assertCompleted();
    }

But I'm getting this exception when trying to call .find() of my repository

java.lang.IllegalStateException: No current Vertx context found

Why is there no session created automatically and how would I tell Quarkus to do so?