test: fixed LobbyManagerTest to not run lobbies

Server/src/test/java/uulm/teamname/marvelous/server/lobbymanager/LobbyManagerTest.java

@@ -1,9 +1,12 @@
 package uulm.teamname.marvelous.server.lobbymanager;
 
 import org.java_websocket.WebSocket;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
 import uulm.teamname.marvelous.gamelibrary.messages.BasicMessage;
 import uulm.teamname.marvelous.gamelibrary.messages.ParticipantType;
 import uulm.teamname.marvelous.gamelibrary.messages.RoleEnum;
@@ -33,6 +36,9 @@ class LobbyManagerTest {
     Participant player2Participant;
     Participant player3Participant;
 
+    LobbyRunner lobbyRunner;
+    MockedStatic<LobbyRunner> lobbyRunnerMockedStatic;
+
     @BeforeEach
     void beforeEach() {
 
@@ -67,6 +73,17 @@ class LobbyManagerTest {
                 player3,
                 ParticipantType.PlayerOne,
                 "AwesomestAwesomePlayer");
+
+        lobbyRunner = spy(LobbyRunner.getInstance());
+        doNothing().when(lobbyRunner).startLobby(any(LobbyConnection.class));
+
+        lobbyRunnerMockedStatic = Mockito.mockStatic(LobbyRunner.class);
+        lobbyRunnerMockedStatic.when(LobbyRunner::getInstance).thenReturn(lobbyRunner);
+    }
+
+    @AfterEach
+    void afterEach() {
+        lobbyRunnerMockedStatic.close();
     }
 
     @Test
@@ -77,6 +94,9 @@ class LobbyManagerTest {
     @Test
     @DisplayName("When a participant is added, a new Lobby is created")
     void lobbyCreationTest() {
+
+
+
         var message = new PlayerReadyMessage();
         message.role = RoleEnum.PLAYER;