I have a Node.js application and it already has Unit Tests and is using the Mocha framework for the same. It is checking the functions individually. These tests are integrated into the CI/CD pipeline in Bamboo and so if there is an error, it will stop the build job and alert the user who has pushed the change. Now I have a requirement that I need to validate a JSON file, which is available on one of the S3 buckets. It downloads the file once the Node.js application is started in the local environment. I have unit tests to check whether the downloading functionality is working or not and it is working fine. Now for the validation purpose, I am a little confused about whether I need to add it as a unit test or an integration test. I am new to QA and I would like to do it in the right way. As of now, there are no integration tests are in place(No tests are checking the API endpoints). It will be helpful if someone can point me in the right direction. Also, it will be helpful if someone can suggest the framework I need to use with Node.js for writing integration tests.