I've tried the following test:

	@Test
	public void testExceptionPropagation(VertxTestContext context) {
		test( context, getMutinySessionFactory()
				.withTransaction( session -> {
					int loop = 5000;
					Uni<?> uni = Uni.createFrom().voidItem();
					for ( int i = 0; i < loop; i++ ) {
						final int index = i;
						uni = uni.invoke( () -> System.out.println( index ) );
					}
					System.out.println("Finished chaining uni");
					return uni;
				} )
				.invoke( () -> System.out.println("End") )
		);
	}

and it gets stuck until until the timeout is reached:

The test execution timed out. Make sure your asynchronous code includes calls to either VertxTestContext#completeNow(), VertxTestContext#failNow() or Checkpoint#flag()

Unsatisfied checkpoints diagnostics:

java.util.concurrent.TimeoutException: The test execution timed out. Make sure your asynchronous code includes calls to either VertxTestContext#completeNow(), VertxTestContext#failNow() or Checkpoint#flag()

Unsatisfied checkpoints diagnostics:

	at io.vertx.junit5.VertxExtension.joinActiveTestContexts(VertxExtension.java:216)
	at io.vertx.junit5.VertxExtension.interceptTestMethod(VertxExtension.java:143)
	at

The same test passes if the loop variable is smaller.
It also works when we use a trampoline:

	@Test
	public void testExceptionPropagationWithLoop(VertxTestContext context) {
		test( context, getMutinySessionFactory()
				.withTransaction( session -> Uni.createFrom().completionStage( loop(
						0, 50000, i -> true, i -> {
							System.out.println( i );
							return completedFuture( i );
						}
				) ) )
				.invoke( () -> System.out.println("End") )
		);
	}

I think what's happening is that the number of chained uni is too big and Mutiny doesn't throw any exception and gets stuck instead (completion stages would throw a StackOverflow exception).

@tsegismont, any idea about how to make the error clearer to the user? Maybe there's an option in Mutiny? Thanks

I've added the tests to the latest main here: https://github.com/DavideD/hibernate-reactive/commits/1808/

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