Playwright Python Hindi #9 - Assertions (Expect vs Assert) | Master Web Validation for QA Jobs

Learn Playwright Python Assertions in this Hindi tutorial! Master expect vs assert, auto-waiting, page & element validation, URL/title checks, checkbox states & error message verification for QA automation.

🚀 Assertions are the HEART of test automation — they're how your scripts actually verify that something works. In this episode, we break down everything you need to know about validation in Playwright with Python, with hands-on practical examples you can follow along with.

If you've ever wondered "how does my test script KNOW if a test passed or failed?" — this video answers exactly that. We cover the most common INTERVIEW questions on assertions too!

By the end of this video you will understand:
✅ What assertions are (validation against the UI vs expected result)
✅ The difference between expect (Playwright built-in) and assert (Python built-in)
✅ Why expect is recommended — auto-wait & auto-retry features
✅ How pytest wraps assert to make error messages cleaner & readable
✅ Page-level vs Element-level assertions
✅ Real practical: verifying page URL & title after login
✅ Checkbox validation — to_be_checked, not_to_be_checked, to_be_visible
✅ Text verification with to_have_text and contains
✅ Building a complete positive & negative login test case
✅ Verifying error messages for invalid username/password

📌 KEY TOPICS COVERED:
- Assertion = validation against something on the UI vs the expected value
- Checkpoints: condition TRUE = pass, FALSE = fail
- expect comes from playwright.sync_api (needs import)
- assert is built into the Python language (no import needed)
- expect has auto-wait + auto-retry until timeout; assert does not
- Playwright throws AssertionError on failure
- Importing expect with sync API
- Page = full container; Element = single item (link, image, checkbox)
- expect(page).to_have_url() and to_have_title()
- Locating elements with SelectorHub / XPath / CSS selectors
- expect(locator).to_be_visible() and to_be_checked()
- page.locator() for passing locators into expect
- contains text vs to_have_text (partial vs full match)
- Why automation verification matters vs just "seeing it in the browser"
- Positive login flow: fill username, password, click submit
- Negative login flow: invalid credentials & error message assertion

⏱️ TIMESTAMPS:
00:00 Introduction & Recap (Locators)
00:35 What is an Assertion? (Validation Explained)
01:37 Two Types of Assertions in Playwright Python
02:06 expect vs assert — Built-in Source Explained
03:01 Importing expect from Playwright Sync API
03:49 expect Features: Auto-Wait & Auto-Retry
04:29 Interview Question: Where does assert come from?
04:47 How Pytest Wraps assert (Cleaner Error Messages)
05:49 expect vs assert Comparison Table
06:36 Playwright Official Assertions Documentation
07:33 Page vs Element — Key Difference
10:41 Practical: Setting Up the Test File
13:21 Asserting Page URL with to_have_url
17:31 Asserting Page Title with to_have_title
20:52 Checkbox Visibility: to_be_visible
26:09 Fixing the Locator with page.locator()
28:43 Checkbox Checked State: to_be_checked
31:46 Verifying Unchecked: not_to_be_checked
34:01 Text Verification: to_have_text vs contains
40:46 Building a Positive Login Test Case
49:17 Asserting URL After Successful Login
51:46 Verifying Page Content Text
54:55 Verifying Logout Element Visibility
57:38 Assignment: Negative Login Test Case
1:00:29 Verifying Invalid Username Error Message
1:06:01 Why Automation Verification Beats Manual Checking

📢 If this helped you understand Playwright assertions, SMASH that LIKE button 👍, SUBSCRIBE for the full Playwright Python Hindi series 🔔, and COMMENT your questions below — I reply to every one!

Consistency is the key to cracking QA Automation interviews. Practice every concept yourself, don't just watch. Your dream QA job is closer than you think! 💪

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👨‍💻 Perfect for: Beginners | QA Engineers | Automation Testers | Manual Testers moving to Automation

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