package com.baeldung.websocket.client; import org.baeldung.websocket.client.MyStompSessionHandler; import org.junit.Test; import org.mockito.Mockito; import org.springframework.messaging.simp.stomp.StompHeaders; import org.springframework.messaging.simp.stomp.StompSession; public class MyStompSessionHandlerIntegrationTest { @Test public void givenValidSession_whenConnected_SendsMessage() { StompSession mockSession = Mockito.mock(StompSession.class); StompHeaders mockHeader = Mockito.mock(StompHeaders.class); MyStompSessionHandler sessionHandler = new MyStompSessionHandler(); sessionHandler.afterConnected(mockSession, mockHeader); Mockito.verify(mockSession).subscribe("/topic/messages", sessionHandler); Mockito.verify(mockSession).send(Mockito.anyString(), Mockito.anyObject()); } }