JUnit 5预期异常

超、凢脫俗 2023-02-15 05:10 5阅读 0赞

在JUnit 5中，我们可以使用`assertThrows`声明抛出了异常。

*PS已通过JUnit 5.5.2测试*

## 1.未检查的异常 ##

1.1捕获运行时异常的JUnit示例。

ExceptionExample1.java

package com.mkyong.assertions;
    
    import org.junit.jupiter.api.Test;
    
    import static org.junit.jupiter.api.Assertions.*;
    
    public class ExceptionExample1 {
    
        @Test
        void test_exception() {
    
            Exception exception = assertThrows(
    			ArithmeticException.class, 
    			() -> divide(1, 0));
    
            assertEquals("/ by zero", exception.getMessage());
    
            assertTrue(exception.getMessage().contains("zero"));
    
        }
    
        int divide(int input, int divide) {
            return input / divide;
        }
    }

## 2.检查异常 ##

2.1捕获自定义/编译时间异常的JUnit示例。

NameNotFoundException.java

package com.mkyong.assertions;
    
    public class NameNotFoundException extends Exception {
        public NameNotFoundException(String message) {
            super(message);
        }
    }

ExceptionExample2.java

package com.mkyong.assertions;
    
    import org.junit.jupiter.api.Test;
    
    import static org.junit.jupiter.api.Assertions.*;
    
    public class ExceptionExample2 {
    
        @Test
        void test_exception_custom() {
            Exception exception = assertThrows(
    			NameNotFoundException.class, 
    			() -> findByName("mkyong"));
    			
            assertTrue(exception.getMessage().contains("not found"));
        }
    
        String findByName(String name) throws NameNotFoundException{
            throw new NameNotFoundException( name + " not found!");
        }
    }

## 下载源代码 ##

> $ git clone [https://github.com/mkyong/junit-examples][https_github.com_mkyong_junit-examples]  
> $ cd junit5-examples  
> $检查src / test / java / com / mkyong / assertions / \*。java

# 参考文献 #

*  [JUnit 5断言][JUnit 5]
 *  Java自定义异常示例

标签： [异常][Link 1] [预期异常][Link 2] [junit 5][]

> 翻译自: [https://mkyong.com/junit5/junit-5-expected-exception/][https_mkyong.com_junit5_junit-5-expected-exception]

[https_github.com_mkyong_junit-examples]: https://github.com/mkyong/junit-examples
[JUnit 5]: https://junit.org/junit5/docs/current/user-guide/#writing-tests-assertions
[Link 1]: https://mkyong.com/tag/exception/
[Link 2]: https://mkyong.com/tag/expected-exception/
[junit 5]: https://mkyong.com/tag/junit-5/
[https_mkyong.com_junit5_junit-5-expected-exception]: https://mkyong.com/junit5/junit-5-expected-exception/