Loopback 4 - Connect to test database on Npm Test - loopbackjs

Question

I want to run an in-memory database for my tests, but I'm unable to make my application connect to it when I run npm test.
When I run npm test i get:
Connection fails: Error: ER_ACCESS_DENIED_ERROR: Access denied for user ''#'172.21.0.1' (using password: NO)
This is happening because I'm not setting any env variables on npm test, but I don't want to use MySQL on my tests and just an in-memory database, here what I have.
testdb.datasources.ts
import {juggler} from '#loopback/repository';
export const testdb: juggler.DataSource = new juggler.DataSource({
name: 'testdb',
connector: 'memory',
});
country.controller.acceptance.ts
import {Client, expect} from '#loopback/testlab';
import {MyApplication} from '../..';
import {setupApplication} from './test-helper';
import {givenEmptyDatabase} from '../helpers/database.helpers';
describe('Country Controller', () => {
let app: MyApplication;
let client: Client;
before('setupApllication', async () => {
({app, client} = await setupApplication());
});
before(givenEmptyDatabase);
// before(givenRunningApp);
after(async () => {
await app.stop();
});
it('Should count 0 countries', async () => {
const res = await client.get('/countries/count').expect(200);
//assertations
expect(res.body.count).to.equal(0);
});
});
test-helper.ts
import {MyApplication} from '../..';
import {
createRestAppClient,
givenHttpServerConfig,
Client,
} from '#loopback/testlab';
import {testdb} from '../fixtures/datasources/testdb.datasource';
export async function setupApplication(): Promise<AppWithClient> {
const app = new MyApplication({
rest: givenHttpServerConfig({host: 'localhost'}),
});
app.dataSource(testdb); // <--- Hoped this would do the job
await app.boot();
await app.start();
const client = createRestAppClient(app);
return {app, client};
}
export interface AppWithClient {
app: MyApplication;
client: Client;
}
The Country controller is just a standard controller create using lb4 controller.
#get('/countries/count', {
responses: {
'200': {
description: 'country model count',
content: {'application/json': {schema: countschema}},
},
},
})
async count(
#param.query.object('where', getwhereschemafor(country)) where?: where,
): promise<count> {
return await this.countryrepository.count(where);
}
Any ideas on whats going wrong?

Answer 1

i Found this way that works for me
Change this:
app.dataSource(testdb);
To this:
await app.bind('datasource.config.db').to({
name: 'db',
connector: 'memory'
});
You are just changing the configurations of datasource to use a local database but is still the same datasource!
make sure that the string of bind is the same used in your main datasource!