Creating a dynamic web page using Spring internalizr (Gradle), IntelliJ, and AWS EC2 - Step 4 XXS prevention, writing test code

1. Avoid XXS

Change and save the textarea value to prevent script attacks. In the case of the existing popol, the textarea is at the mail transmission end, and to set this part, security is processed when the mail sending button is pressed.

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2. Write JUnit test code

I wrote test code for the email sending part. Although it is an extension of stage 3, it was written in stage 4 considering it as a maintenance and repair section.

As a result, when all tests are completed, you can see that the mail is sent as set as follows.

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+ Resolving errors

When running the test, the email was sent well, but a failure message appeared while executing the Controller method of the original code.

Looking at the content, it appears that NullPointer has occurred. I thought it was because of the part where parameter values ​​were received in the existing method (there was a ModelAndView among the parameter values, but it was not received properly).

This was solved by setting the initial value of ModelAndView to new ModelAndView to prevent Nulls from occurring.

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