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{
  "name": "jest",
  "version": "1.0.0",
  "main": "sum.js",
  "repository": "[email protected]:87a5d1b26cf2becc5d826d224c5b13f0.git",
  "author": "EdgarJRG <[email protected]>",
  "license": "MIT",
  "scripts": {
    "test": "jest"
  },

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init:
  brew install yarn
  yarn init

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instalar_yarn:
  brew install yarn

iniciar_yarn:
  yarn init

instalar_packetes_basicos:
  yarn add koa koa-bodyparser koa-router

todos:

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compose = docker-compose -f ./docker-compose.yml

apps-up:
  ${compose} up ${app}

apps-up-bg:
  ${compose} up -d ${app}

apps-down:
  ${compose} down ${app}

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jest_desde_cero:
  rm -rf ./jest
  mkdir jest
  cd ./jest && \
  git clone https://gist.github.com/87a5d1b26cf2becc5d826d224c5b13f0.git . && \
  yarn install --prefer-offline && \
  npx jest --init && \
  yarn test

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import { lens } from './lens';

test('adds 1 + 2 to equal 3', () => {
  const unique = Symbol('nested')
  expect(lens({
    some: {
      nested: {
        value: unique
      }
    }

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function double_every_element(numbers: number[]) {
  let result: number[] = [];

  for (let i = 0; i < numbers.length; i++) {
    result.push(2 * numbers[i])
  }

  return result;
}

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import { double_every_element } from './double_every_element'

test('double every element', () => {

  expect(double_every_element([1, 2, 3])).toEqual([2, 4, 6])

})

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import { sum_of_every_element } from './sum_of_every_element'

test('calculate the sum of all elements using reduce', () => {

  expect(sum_of_every_element([1, 2, 3])).toEqual(6)

})

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import { double_sum2_to_string } from './compose'

test('stringify after add 2 after double', () => {

  expect(double_sum2_to_string([1, 2, 3])).toEqual(['4', '6', '8'])

})