mock a registered resolver in awilix - node.js

Question

I have used awilix to be able to have dependency injection in javascript to be able to have easier test. but now I want to mock a resolver that is set in my container for only a set of tests
In other words, I have a resolver that I want to mock it in my test for some reasons, (it is costly to call it so many times and it is a time consuming network call.) thus, I need to mock it in many of my tests for example in a test which is called called b.test.js, but I want it to call the actual function in a.test.js
here is my awilix config
var awilix = require('awilix');
var container = awilix.createContainer({
injectionMode: awilix.InjectionMode.PROXY,
});
var network = () => {
return new Promise((resolve, reject) => {
setTimeout(() => { resolve('data') }, 3000);
});
}
module.exports = container.register({ network: awilix.asValue(network) });
my test is
const container = require('../container');
container.register({
heavyTask: awilix.asValue(mockFunction),
});
describe('b', () => {
it('b', async () => {
const result = await container.resolve('network')();
});
});

Answer 1

somehow you've already done it
but don't config container like what you've done, because this way you're gonna have a single object of container, so if you change that object it'll be changed in all tests, instead do it this way
const awilix = require('awilix');
const heavyTask = () => new Promise((resolve, reject) => {
setTimeout(() => {
resolve('actual run');
}, 3000);
});
const configContainer = () => {
const container = awilix.createContainer({
injectionMode: awilix.InjectionMode.PROXY,
});
return container.register({
heavyTask: awilix.asValue(heavyTask),
});
}
module.exports = configContainer;
it seems you already know that you can overwrite your registrations, which might be the only vague part
so a.test.js can be written as
const { describe, it } = require('mocha');
const { expect } = require('chai');
const configContainer = require('../container');
const container = configContainer();
describe('a', () => {
it('a', async () => {
const res = await container.resolve('heavyTask')();
expect(res).to.eq('actual run');
});
});
and test b can be written as something like this
const awilix = require('awilix');
const { describe, it } = require('mocha');
const { expect } = require('chai');
const configContainer = require('../container');
const container = configContainer();
const heavyTask = () => 'mock run';
container.register({
heavyTask: awilix.asValue(heavyTask),
});
describe('b', () => {
it('b', async () => {
const res = await container.resolve('heavyTask')();
expect(res).to.eq('mock run');
});
});