Snippet for my Medium article

di-test-example.js

describe('Todos Service', function () {
  beforeEach(() {
    subject = makeTodosService({
      db: testDatabaseSomehow
    })
  })
  
  it('works', async function () {
    const todos = await subject.getTodos()
    expect(todos.length).to.equal(3)
  })
})