Add unit tests

[jrichardsz]

Summary of PR changes

• Adding unit tests for Node.js.

Questions

• Should I add code coverage to check for uncovered methods or branches?

Comments

1️⃣ If Node.js tests are included, the Bash tests will function as integration tests.

2️⃣ The build was executed, but since no changes were made to the source code (only tests), Git did not detect it as a change.

build log

3️⃣ The YAML input input-file: ./env-vars.yml is mandatory, which contradicts what is described in the Markdown.

[JosephDSchwartz]

It would be cool to add a test showing which one, either file or environment variable, takes priority in the case of a variable being define in both. I can't remember which one does, and can't find it in the README, so it might be worth updating that too.

That said, this comment and my other comment aren't super important, so I'll let you decide if you want to do anything about them. I'll approve for now. If you need a re-review after making any updates, feel free to reach out to me.

[JosephDSchwartz]

The existence of config_02.yml makes me think there is a config.yml or config_01.yml, so it's a little weird, but not a problem strictly speaking.

[richard-leon-130524]

You are right. I will use the base config.yml