testing_setup_comment.html

<!-- 
                *****babel & jest configuration setup*****
    For testing we use the jest framwork and babel is used to support .mjs files. Babel helps to converts modules to common js.

    1. install babel & jest packages; install command: "npm i -D @babel/core @babel/node @babel/preset-env jest".
    2. create a .babelrc file in main project folder,'express', and configure the file as shown in that .babelrc file.
    3. using terminal install the jest using command: npm init jest@latest
        for correct answers of the prompts during install see the screenshot in mian folder.
    4. configure the automatically created "jest.config.mjs" after completing step 3.
        Here, the ' moduleFileExtensions[...]' array is modified by removing unnecessary extentions.
        Then, for transform map we set: {"^.+\\m?js$" : "babel-jest",}. It is obtained from JEST Code Transformation web page.
    5. Create jsconfig.json and configure the file as shown in that jsconfig.json file. Also , install another npm package : npm i -D @types/jest.
    6. Finally,check the package.json file where the test value inside scripts will be "jest"   


        ____##### , Now we are set to go for testing , #####_________
 -->