org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here:
-> at org.jivesoftware.openfire.session.LocalOutgoingServerSessionTest.setUpEach(LocalOutgoingServerSessionTest.java:149)

E.g. thenReturn() may be missing.
Examples of correct stubbing:
    when(mock.isOk()).thenReturn(true);
    when(mock.isOk()).thenThrow(exception);
(64 more lines...)

java.lang.ClassCastException: class org.jivesoftware.openfire.RoutingTable$MockitoMock$dDSunEBy cannot be cast to class org.jivesoftware.openfire.ConnectionManager (org.jivesoftware.openfire.RoutingTable$MockitoMock$dDSunEBy and org.jivesoftware.openfire.ConnectionManager are in unnamed module of loader 'app')
	at org.jivesoftware.openfire.XMPPServer.getConnectionManager(XMPPServer.java:1317)
	at org.jivesoftware.openfire.session.LocalOutgoingServerSession.createOutgoingSession(LocalOutgoingServerSession.java:258)
	at org.jivesoftware.openfire.session.LocalOutgoingServerSessionTest.outgoingTest(LocalOutgoingServerSessionTest.java:296)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at java.base/java.util.Optional.ifPresent(Optional.java:178)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
(37 more lines...)