week 10

Week 10: Browser Automation & API Testing - 40 Python Snippets

This week covers Selenium for browser automation, interacting with web elements, Postman for API testing, and writing pytest-based API tests. Below are 40 Python snippets categorized into 4 topics (10 per topic).

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1️⃣ Selenium for Browser Automation (10 Snippets)

1. Install Selenium & WebDriver

pip install selenium

2. Open a Browser & Navigate to a Page

from selenium import webdriver

driver = webdriver.Chrome()  # Make sure ChromeDriver is installed
driver.get("https://www.google.com")
print(driver.title)
driver.quit()

3. Taking a Screenshot of a Web Page

driver.get("https://www.google.com")
driver.save_screenshot("screenshot.png")
driver.quit()

4. Getting Page Source

print(driver.page_source)

5. Navigating Back and Forward

driver.get("https://www.google.com")
driver.get("https://www.bing.com")
driver.back()
driver.forward()

6. Setting Browser Window Size

driver.set_window_size(1024, 768)

7. Running Headless Browser

options = webdriver.ChromeOptions()
options.add_argument("--headless")
driver = webdriver.Chrome(options=options)
driver.get("https://www.google.com")
print(driver.title)
driver.quit()

8. Handling Browser Alerts

alert = driver.switch_to.alert
print(alert.text)
alert.accept()

9. Waiting for an Element to Load (Explicit Wait)

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 10)
element = wait.until(EC.presence_of_element_located((By.ID, "search-box")))
print(element.text)

10. Closing the Browser

driver.close()  # Closes the current tab
driver.quit()   # Closes the entire browser

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2️⃣ Interacting with Web Elements (10 Snippets)

11. Finding an Element by ID & Entering Text

search_box = driver.find_element("id", "search-box")
search_box.send_keys("Selenium Python")

12. Clicking a Button

button = driver.find_element("id", "search-button")
button.click()

13. Finding an Element by Name

element = driver.find_element("name", "username")
element.send_keys("testuser")

14. Finding an Element by XPath

element = driver.find_element("xpath", "//button[@id='submit']")
element.click()

15. Finding an Element by CSS Selector

element = driver.find_element("css selector", ".login-btn")
element.click()

16. Selecting from a Dropdown Menu

from selenium.webdriver.support.ui import Select

dropdown = Select(driver.find_element("id", "dropdown-menu"))
dropdown.select_by_visible_text("Option 1")

17. Checking If an Element is Displayed

if element.is_displayed():
    print("Element is visible")

18. Getting Text from an Element

text = driver.find_element("id", "message").text
print(text)

19. Scrolling a Web Page

driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

20. Handling File Uploads

file_input = driver.find_element("id", "file-upload")
file_input.send_keys("/path/to/file.txt")

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3️⃣ Postman for API Testing (10 Snippets)

21. Install Postman

• Download from Postman Official Site.

22. Making a GET Request in Postman

• Open Postman

• Select GET method

• Enter URL: https://jsonplaceholder.typicode.com/posts/1

• Click Send

23. Making a POST Request in Postman

• Select POST method

• Enter URL: https://jsonplaceholder.typicode.com/posts

• Go to Body → raw → JSON and enter:

{
  "title": "New Post",
  "body": "This is the post content",
  "userId": 1
}

• Click Send

24. Making a PUT Request in Postman

• Select PUT method

• URL: https://jsonplaceholder.typicode.com/posts/1

• Body:

{
  "id": 1,
  "title": "Updated Post",
  "body": "Updated content",
  "userId": 1
}

• Click Send

25. Making a DELETE Request in Postman

• Select DELETE method

• URL: https://jsonplaceholder.typicode.com/posts/1

• Click Send

26. Setting Headers in Postman

• Go to Headers

• Add:

  • Content-Type: application/json

  • Authorization: Bearer <token>

27. Handling Authentication in Postman

• Go to Authorization tab

• Select Bearer Token

• Enter token value

28. Running a Collection in Postman

• Click Runner

• Select Collection

• Click Run

29. Setting Environment Variables in Postman

• Go to Environments

• Add variable {{base_url}} = https://api.example.com

30. Writing a Test Script in Postman

• Go to Tests tab

• Add:

pm.test("Response is 200", function () {
    pm.response.to.have.status(200);
});

• Click Send

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4️⃣ Writing Pytest-Based API Tests (10 Snippets)

31. Install pytest & requests

pip install pytest requests

32. Writing a Simple GET API Test

import requests

def test_get_request():
    response = requests.get("https://jsonplaceholder.typicode.com/posts/1")
    assert response.status_code == 200

33. Running Tests with pytest

pytest test_api.py

34. Writing a POST API Test

def test_post_request():
    data = {"title": "Test", "body": "Content", "userId": 1}
    response = requests.post("https://jsonplaceholder.typicode.com/posts", json=data)
    assert response.status_code == 201

35. Testing Response JSON Format

def test_json_response():
    response = requests.get("https://jsonplaceholder.typicode.com/posts/1")
    assert "title" in response.json()

36. Testing a DELETE API

def test_delete_request():
    response = requests.delete("https://jsonplaceholder.typicode.com/posts/1")
    assert response.status_code == 200

37. Using Fixtures for Setup & Teardown

import pytest

@pytest.fixture
def api_url():
    return "https://jsonplaceholder.typicode.com/posts"

def test_get_all_posts(api_url):
    response = requests.get(api_url)
    assert response.status_code == 200

38. Parameterized API Tests

import pytest

@pytest.mark.parametrize("post_id", [1, 2, 3])
def test_multiple_posts(post_id):
    response = requests.get(f"https://jsonplaceholder.typicode.com/posts/{post_id}")
    assert response.status_code == 200

39. Testing Response Time

def test_response_time():
    response = requests.get("https://jsonplaceholder.typicode.com/posts")
    assert response.elapsed.total_seconds() < 1

40. Running Tests & Generating Reports

pytest --html=report.html

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