使用 mockito 时在 catch 块中覆盖 EXCEPTION

Question

待测函数：

public void deleteFile(File file)  {
            
            try {
                Files.delete(file.toPath()) ;
                    
                log.info("Csv file deleted from system succesfully after processing the data");
                    
                
            } catch (IOException e) {
                // TODO Auto-generated catch block
                
            }           
}

测试代码：

@Test
void testExceptionDuringDeletingFile() {
          
      helper=mock(Helper.class);
      
     
      //String bucket ="bucket"; 
      //String key = "key"; 
      File file = new File("");
      
      doThrow(IOException.class).when(helper).deleteFile(file);
      
      Assertions.assertThrows(IOException.class,()->helper.deleteFile(file));
}

但我收到以下异常：

org.mockito.exceptions.base.MockitoException: Checked exception is invalid for this method! Invalid: java.io.IOException at com.lululemon.product.ap.reprocess.producer.HelperTests.testExceptionDuringDeletingFile(HelperTests.java:191) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at

Answer 1

因为您的 deleteFile() 方法不会抛出 IOException。你 catch 它在你的方法实现中并用它做一些事情。

而且，你的模拟 Helper class 实例真的不能从 deleteFile() 方法中抛出 IOException 因为真正的 deleteFile() 方法不会.

从您的方法中抛出 IOException，您将不会收到错误。

删除文件方法：

public void deleteFile(File file) throws IOException {
    try {
        Files.delete(file.toPath());
        log.info("Csv file deleted from system successfully after processing the data");
    } catch (IOException e) {
        throw new IOException("Couldn't delete file. Try again!");
    }
}

测试方法：

@Test
void testExceptionDuringDeletingFile() throws IOException {
    File file = new File("");
        
    Helper helper = mock(Helper.class);
    doThrow(IOException.class).when(helper).deleteFile(file);

    Assertions.assertThrows(IOException.class, () -> helper.deleteFile(file));
}

使用 mockito 时在 catch 块中覆盖 EXCEPTION

Cover EXCEPTION in the catch block while using mockito

java

spring-boot

mockito

junit5

development-environment