如何在 Java 中通过单元测试验证异常处理逻辑？

import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;

public class ExceptionHandlingTest {

    @Test
    public void shouldThrowException() {
        MyService service = new MyService();
        assertThrows(IllegalArgumentException.class, () -> service.doSomething(null));
    }

    @Test
    public void shouldHandleExceptionGracefully() {
        MyService service = new MyService();
        assertDoesNotThrow(() -> service.doSomethingWithExceptionHandling(null));
    }

    // 实际代码示例
    public class MyService {

        public void doSomething(String arg) {
            if (arg == null) {
                throw new IllegalArgumentException("Invalid argument");
            }
            // 其余逻辑
        }

        public void doSomethingWithExceptionHandling(String arg) {
            try {
                doSomething(arg);
            } catch (IllegalArgumentException e) {
                // 处理异常
            }
        }
    }
}