joboccara

require 'test_helper'

class ProductsControllerTest < ActionDispatch::IntegrationTest
  test 'gets a book with its details' do
    book = # Create book with title: 'Item 1', isbn: '1', purchase_price: 42, is_hot: true

    get product_url(book[:id])

    res = response.parsed_body
    assert_equal 'Item 1', res['title']

joboccara

require "test_helper"
require "csv"

class ProductPricesControllerTest < ActionDispatch::IntegrationTest
  teardown do
    Timecop.return
  end

  test 'prices books at +25% margin' do
    book1 = # Create book with title: 'Title of Book1', isbn: '1', purchase_price: 12, is_hot: false

joboccara

################## TEST ######################
# test/controllers/products_controller_test.rb
##############################################
 
  test 'gets an image with its details from an external service' do
    begin
      ENV['IMAGES_FROM_EXTERNAL_SERVICE'] = 'true'
      IMAGE_EXTERNAL_ID = 42
      ImageExternalService.expects(:upload_image_details).with(width: 800, height: 600).returns(IMAGE_EXTERNAL_ID)
      ImageExternalService.expects(:get_image_details).with(IMAGE_EXTERNAL_ID).returns({width: 800, height: 600})

joboccara

const MemoComponent = React.memo(({ onClick }) => {
  const buttonRef = React.useRef(null);
  React.useEffect(() => {
    const buttonDOM = buttonRef.current;
    buttonDOM.addEventListener("click", onClick);
    return () => buttonDOM.removeEventListener("click", onClick);
  }, []);
  return (
    <Button ref={buttonRef}>Click on the memo</button>
  );

joboccara

const onClickMemo = React.useCallback(
    () => window.alert(`clickMemo, count: ${count}`),
    []
  );

joboccara

const countRef = React.useRef(count);
  countRef.current = count;
  const onClickMemo = React.useCallback(
    () => window.alert(`clickMemo, count: ${countRef.current}`),
    []
  );

joboccara

const CountContext = React.createContext(null);
const CountContextProvider = ({ children }) => {
  const [count, setCount] = React.useState(0);
  const countRef = React.useRef(count); // more on this in the next section
  countRef.current = count;
  const onClickMemo = React.useCallback(
    () => window.alert(`clickMemo, count: ${countRef.current}`),
    []
  );
  return (

joboccara

const MemoComponent = React.memo(({ onClick }) => {
  return (
    <>
      <Button onClick={onClick}>Click on the memo</button>
    </>
  );
});

joboccara

const CountContext = React.createContext(null);
const CountContextProvider = ({ children }) => {
  const [count, setCount] = React.useState(0);
  
  const onClickMemo = () =>
    window.alert(`clickMemo, count: ${count}`);
  return (
    <CountContext.Provider value={{ count, setCount }}>
      <GrandParent>{children}</GrandParent>
      <MemoComponent onClick={onClickMemo} />

joboccara

const Child = () => {
  const { count, setCount } = React.useContext(CountContext);
  return (
    <div>
      <Button onClick={() => setCount((count) => count + 1)}>
        Call setCount from context with same value
      </button>
    </div>
  );
};