An example of simple but powerful testing by checking for change in the output of a program.

This data processing pipeline was created by ChatGPT.

Open a terminal, clone the repository, change to the directory and install dependencies:

git clone git@github.com:ashleydavis/javascript-testing-examples.git
cd javascript-testing-examples
cd output-testing
npm install

First run the program:

npm start

Then compare the results.

Use git status or git diff to see if the output file output.json has changed.

Try making a change to the program to change the content of the output file, run the program again (npm start) and then use git diff to see the changes.