Snippet for my Medium article

poor-mans-test.js

import makeTodosService from './todosService'
import TodosRepository from './todosRepository'

describe('Todos System', function () {
  it('works', async function () {
    // This is how DI is done manually
    const todosService = makeTodosService({
      todosRepository: new TodosRepository(),
      // Let's fake it til we make it!
      currentUser: {
        id: 123,
        name: 'Jeff'
      }
    })
    
    // Todos Service already knows who's creating it!
    const created = await todosService.create({
      text: 'Write Medium article'
    })
    expect(created.userId).to.equal(123, 'user id should match currentUser')
    
    const todos = await todosService.getTodos({
      filter: 'ALL'
    })
    expect(todos.length).to.equal(1)
    
    await todosService.update(todo.id, {
      completed: true
    })
    
    const incompleteTodos = await todosService.getTodos({
      filter: 'INCOMPLETED'
    })
    expect(incompleteTodos.length).to.equal(0)
    
    const completedTodos = await todosService.getTodos({
      filter: 'COMPLETED'
    })
    expect(completedTodos.length).to.equal(1)
  })
})