如何在JUnit中实例化共享资源

public class SharedResource {
    private static SharedResource instance;

    private SharedResource() {
        // 初始化共享资源
    }

    public static SharedResource getInstance() {
        if (instance == null) {
            instance = new SharedResource();
        }
        return instance;
    }

    // 提供共享资源的相关方法
}

public class MyTest {
    private static SharedResource sharedResource;

    @BeforeClass
    public static void setUp() {
        sharedResource = SharedResource.getInstance();
    }

    // 测试方法
}

public class MyTest {
    private SharedResource sharedResource;

    @Before
    public void setUp() {
        sharedResource = SharedResource.getInstance();
    }

    // 测试方法
}

public class MyTest {
    private SharedResource sharedResource;

    @Before
    public void setUp() {
        sharedResource = SharedResource.getInstance();
    }

    @Test
    public void testMethod() {
        // 使用共享资源进行测试
    }

    // 其他测试方法
}