我有这样一个类：

public class CloudFormationManager
{
    private static CloudFormationManager cloudFormationManager;
    private final AmazonCloudFormation amazonCloudFormation;

    private CloudFormationManager(final AmazonCloudFormation amazonCloudFormation)
    {
        this.amazonCloudFormation = amazonCloudFormation;
    }

    public List<StackResource> getStackResources(final String stackName)
    {
        ListStackResourcesRequest listStackResourcesRequest = new ListStackResourcesRequest();
        listStackResourcesRequest.setStackName(stackName);
        ListStackResourcesResult listStackResourcesResult =
                amazonCloudFormation.listStackResources(listStackResourcesRequest);

        if (nonNull(listStackResourcesResult))
            return getStackResources(listStackResourcesResult);
        else
            return Collections.emptyList();
    }
}

我开始使用Mockito编写UT，如下所示：

@Test
public class CloudFormationManagerTest
{
    @Mock
    private AmazonCloudFormation amazonCloudFormation;

    @InjectMocks
    CloudFormationManager cloudFormationManager;

    @BeforeMethod
    public void setUp() throws IOException
    {
        CloudFormationManager cloudFormationManager = new CloudFormationManager(amazonCloudFormation); // this statement gives an error.
        MockitoAnnotations.initMocks(this);
    }

    @Test
    void testGetStackResources()
    {

    }

}

现在，在setUp()方法中，我看到一个错误，说这个类不能被初始化，我理解这一点，因为它是一个私有构造函数？那么我该如何使用Mockito初始化它？