How React JS Helps You Land a Software Tester Job Faster

# Playwright (Python): data should refresh after navigation
def test_orders_refresh_after_navigation(page):
    page.goto("http://localhost:3000/orders")
    first = page.get_by_test_id("order-row").first.inner_text()
    page.get_by_role("link", name="Dashboard").click()
    page.get_by_role("link", name="Orders").click()
    # Orders should reflect current data, not a cached first view
    assert page.get_by_test_id("order-row").first.is_visible()

def test_back_button_returns_to_list(page):
    page.goto("http://localhost:3000/orders")
    page.get_by_test_id("order-row").first.click()      # open detail
    assert "/orders/" in page.url
    page.go_back()                                       # browser back
    assert page.url.rstrip("/").endswith("/orders")
    assert page.get_by_test_id("order-row").first.is_visible()

from playwright.sync_api import expect

def test_search_shows_results(page):
    page.goto("http://localhost:3000/products")
    page.get_by_placeholder("Search").fill("kurta")
    page.get_by_role("button", name="Search").click()
    # Auto-waits for the first result instead of a fixed sleep
    expect(page.get_by_test_id("product-card").first).to_be_visible()

from playwright.sync_api import expect

def test_content_after_loading(page):
    page.goto("http://localhost:3000/orders")
    spinner = page.get_by_test_id("loading")
    expect(spinner).to_be_hidden()                 # wait until loading ends
    expect(page.get_by_test_id("order-row").first).to_be_visible()

# Prefer meaning over structure
page.get_by_role("button", name="Add to cart").click()
page.get_by_label("Quantity").fill("2")
page.get_by_test_id("cart-count")           # agreed with developers
# Avoid:
# page.locator(".css-1a2b3c > div:nth-child(2)")

Ask developers to add stable hooks, e.g.:
<button data-testid="checkout-pay">Pay</button>
<div data-testid="order-row">...</div>

Agree a naming convention:
  data-testid="<area>-<thing>"  e.g. cart-item, login-error
This helps automation and does not affect users.

Week 1: How single-page apps work; routing; the DOM
Week 2: Read simple React components; props and state
Week 3: Automate a React demo app with Playwright,
        using roles and test IDs
Week 4: Add async waits; test navigation and back button;
        write 10 stable tests

On any React app, check:
[ ] Data refreshes after navigating away and back
[ ] Forms reset after submission
[ ] Back button behaves correctly
[ ] Loading and error states appear and clear
[ ] State does not leak between users
[ ] Rapid clicks do not double-submit

- Tested React single-page apps, finding state and
  navigation bugs; automated flows with Playwright using
  role-based locators, agreed test IDs and content-based
  waits to avoid flaky tests