Sequelize in-memory sqlite tests isolated db? - sqlite

Question

I have the following tests where I am trying to exercise my db model against a sqlite in-memory database
describe(`task model`, () => {
let Task, sandbox;
beforeEach(() => (sandbox = createSandbox()));
afterEach(() => sandbox.restore());
beforeEach(async () => {
const dbConnection = new Sequelize(`sqlite::memory:`, { logging: false });
stub(dbConnectionModule, `dbConnection`).value(dbConnection);
Task = require(`./models/task.js`).Task;
await dbConnection.sync({ force: true });
});
describe(`create a task`, () => {
let task;
beforeEach(async () => {
task = Task.build(taskData);
await task.save();
});
it(`gets an id`, () => expect(task.id).to.not.be.empty);
it(`shows up with a find all`, async () => {
const tasks = await Task.findAll();
expect(tasks).to.have.length(1);
});
});
});
I can verify the connection was newed up twice and yet my second test confusingly comes back with 2 tasks created.
It seems to be using the same db as on the first test!
I was under the impression that I would get a new in-memory db each time the Sequelize constructor is called for sqlite's in-memory db, am I misunderstanding something?
Alternately, how do I drop and recreate the database entirely for a new test?
Surprisingly, even the following after the sync doesn't seem to work
for (const model of Object.values(dbConnection.models))
model.destroy({ truncate: true });

Answer 1

Hihi,
What I did was to replace the database in the index file, not in the tests.
models/index.js
...
const sequelize = require('sequelize')
let sequelize;
if(process.env.NODE_ENV === 'test') {
sequelize = new Sequelize('sqlite::memory:');
}
...
and in your tests just import as usual
const { Task } = require('./models/index.js');
describe(`task model`, () => {
beforeEach(() => (sandbox = createSandbox()));
describe(`create a task`, () => {
let task;
beforeEach(async () => {
task = Task.build(taskData);
await task.save();
});
it(`gets an id`, () => expect(task.id).to.not.be.empty);
it(`shows up with a find all`, async () => {
const tasks = await Task.findAll();
expect(tasks).to.have.length(1);
});
});
});
You must/should implement a solution to init the database in every test you do.