How to unit test an openfn job expression

Note that you must be using compiler v1.2 (in worker vX and CLI version Y) for expressions with export statements to work

This repo includes an importJob function which will dynamically import and compile an openfn job expression.

You can then unit test any imports from that function.

Let's say you have some job code like this:

// expression.js
export const myfn = () => "hello mtuchi";

fn(() => {
  return {
    data: myfn(),
  };
});

And let's say you want to unit test myfn - which is just a regular vanilla JS function

Use the importJob function to import the job as a module:

import importJob from "./importer.js";
const { myfn } = await importJob("./expression.js");

You may need to specify an adaptor - just pass the name as the second argument:

const { myfn } = await importJob("./expression.js", "http");

Now you can use it with mocha or jest or ava or whatever you want

const { myfn } = await importJob("./expression.js");

it('should work', () => {
    const result = myfn()
    expdect(result).toEqual('hello mtuchi')
})

Requirements:

• Any adaptors you want to use must be npm installed to your repo
• You can only unit test pure functions. Not operations or real job steps
• Do not import npm modules in your job code
• This does NOT use or touch the openfn runtime