带有自定义异常的JUnit测试失败条件出错

import org.junit.Test;

public class MyTest {

    @Test
    public void testSomething() throws MyCustomException {
        // 假设我们要测试的方法返回值应该大于等于0
        int result = someMethod();
        
        if (result < 0) {
            throw new MyCustomException("测试失败，返回值小于0");
        }
    }
    
    private int someMethod() {
        // 这里是被测试的方法的实现
        // 假设返回一个负数
        return -1;
    }
    
    // 自定义异常类
    private class MyCustomException extends Exception {
        public MyCustomException(String message) {
            super(message);
        }
    }
}

@Test(expected = MyCustomException.class)
public void testSomething() throws MyCustomException {
    // ...
}