test compiler output with sim API

[ekeren]

Wanted to start a discussion about the option to test the compiler using the sim api.
Here is a small example of how one test can look like (using jest)

code.w

bring cloud;

let bucket = new cloud.Bucket();
inflight my_inflight(a:str): str{
  bucket.put("file.txt", a);
};

new cloud.Function(my_inflight);

basic.test.ts

import * as sdk from '@winglang/wingsdk';
import * as child from 'child_process';

//TOOD replace this with something that is not quick and dirty 
const SIM_FILE = __dirname + "/../app.wx";
const WING_COMMAND = "/Users/eyalkeren/monada-workspace/wing-test-propsal/node_modules/.bin/wing";
const WING_CODE =  __dirname + "/code.w"

let simulator : sdk.testing.Simulator
describe('basic compiler tests', () => { 
  beforeAll(async () => {
    child.execSync(WING_COMMAND + " compile --target sim " + WING_CODE )
  });
  beforeEach(async ()=> {
    simulator = new sdk.testing.Simulator({simfile : SIM_FILE}) //TOOD
    await simulator.start()
  });
  afterEach(async () => {
    await simulator.stop()
  })
  test('test function writes to bucket', async () => {
    let bucket = simulator.getResourceByPath("root/cloud.Bucket") as sdk.sim.IBucketClient
    let fn = simulator.getResourceByPath("root/cloud.Function") as sdk.sim.IFunctionClient
    await fn.invoke("somevalue")
    let output = await bucket.get('file.txt')
    expect(output).toBe('somevalue')
  });
});

[Chriscbr]

Totally! This is a great idea 👍

[eladb]

child.execSync(WING_COMMAND + " compile --target sim " + WING_CODE)

I think we should expose our compiler as a library API (I even suspect it already is exported), so spawning a child process is not needed.

So basically, I'd want something like:

import { compile } from '@winglang/wing';
import * as testing from '@winglang/sdk';

const wxpath = await compile('./hello.w', { target: 'sim' });
const sim new testing.Simulator({ simfile: wxpath });
// ...

[ekeren]

I was wondering if we have the above api available.

@yoav-steinberg ?