在自定义字段中使用特定条件断言预期的异常

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

public class CustomFieldTest {

    @Test
    public void testCustomFieldWithException() {
        // 创建一个自定义对象，假设它在某些条件下会抛出异常
        CustomObject obj = new CustomObject();

        // 断言在特定条件下抛出预期的异常
        Exception exception = assertThrows(IllegalArgumentException.class, () -> {
            obj.setCustomField(-1); // 假设-1是一个非法值
        });

        // 可选：进一步验证异常消息
        String expectedMessage = "Custom field value must be non-negative";
        String actualMessage = exception.getMessage();

        assertTrue(actualMessage.contains(expectedMessage));
    }
}

class CustomObject {
    private int customField;

    public void setCustomField(int value) {
        if (value < 0) {
            throw new IllegalArgumentException("Custom field value must be non-negative");
        }
        this.customField = value;
    }
}

Throwable cause = exception.getCause();
assertTrue(cause instanceof SomeUnderlyingException);