FußballvereinTest.java

import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import java.util.HashMap;

public class FußballvereinTest {

    private Fußballverein club;

    @Before
    public void setUp() {
        club = new Fußballverein();
    }

    @Test
    public void testAddPlayer() {
        club.addPlayer("Lionel Messi", 10);
        club.addPlayer("Cristiano Ronaldo", 7);

        HashMap<String, Integer> expected = new HashMap<>();
        expected.put("Lionel Messi", 10);
        expected.put("Cristiano Ronaldo", 7);

        assertEquals(expected, club.getPlayers());
    }

    @Test
    public void testRemovePlayer() {
        club.addPlayer("Lionel Messi", 10);
        club.addPlayer("Cristiano Ronaldo", 7);

        club.removePlayer("Lionel Messi");

        HashMap<String, Integer> expected = new HashMap<>();
        expected.put("Cristiano Ronaldo", 7);

        assertEquals(expected, club.getPlayers());
    }

    @Test
    public void testGetPlayerNumber() {
        club.addPlayer("Lionel Messi", 10);
        club.addPlayer("Cristiano Ronaldo", 7);

        assertEquals(10, club.getPlayerNumber("Lionel Messi"));
        assertEquals(7, club.getPlayerNumber("Cristiano Ronaldo"));
    }

    @Test
    public void testGetPlayerNumberNonExistent() {
        assertEquals(-1, club.getPlayerNumber("Neymar"));
    }
}