add findRunningGamesOfUser-Test

fh.fd.ci.server/src/test/java/de/fd/fh/server/game/GameServiceTest.java

@@ -5,6 +5,7 @@ import dev.morphia.Key;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
 
+import java.util.List;
 import java.util.Set;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -89,4 +90,18 @@ class GameServiceTest
 
         assertNotNull(result);
     }
+
+    @Test
+    void given_storedGames_when_findGamesOfUser_should_returnSetOfGames()
+    {
+        final GameRepository repository = when(mock(GameRepository.class).findRunningGamesOfPlayer(any(UserId.class)))
+                .thenReturn(List.of(
+                        new Game(GameId.random(), UserId.of("12345"), UserId.random(), null, null, null),
+                        new Game(GameId.random(), UserId.random(), UserId.of("12345"), null, null, null)))
+                .getMock();
+
+        final List<Game> result = new GameService(repository).findRunningGamesOfUser(UserId.of("12345"));
+
+        assertEquals(2, result.size());
+    }
 }