Selenium Automation Coding Questions

Open Browser and Launch Website

Question:
Write a Selenium script to open Chrome and launch a website.

Answer (Python + Selenium):


from selenium import webdriver

# Launch Chrome
driver = webdriver.Chrome()

# Open website
driver.get("https://www.google.com")

# Maximize window
driver.maximize_window()

# Close browser
driver.quit()

What interviewer checks:
✔ Selenium basics
✔ WebDriver knowledge

Locate Element and Perform Login

Question:
Write code to enter username, password, and click login button.

Answer:


from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()

driver.get("https://example.com/login")

# Enter username
driver.find_element(By.ID, "username").send_keys("testuser")

# Enter password
driver.find_element(By.ID, "password").send_keys("123456")

# Click login
driver.find_element(By.ID, "login").click()

driver.quit()

Important Tip:
Explain locator strategy if asked.

Use Explicit Wait

Very Frequently Asked

Question:
Wait until login button is clickable.

Answer:


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)

login_btn = wait.until(
    EC.element_to_be_clickable((By.ID, "login"))
)

login_btn.click()

Why this matters:
Most UI failures happen due to synchronization issues.

Handle Dropdown

Question:
Select value from dropdown.

Answer:


from selenium.webdriver.support.ui import Select

dropdown = Select(driver.find_element(By.ID, "country"))

dropdown.select_by_visible_text("India")

Handle Alert Popup

Question:
Handle alert popup.

Answer:


alert = driver.switch_to.alert

print(alert.text)

alert.accept()

Take Screenshot

Very Important Question

Answer:


driver.save_screenshot("login_error.png")

Real usage:
Take screenshot on failure.

Handle Multiple Windows

Question:
Switch to new window.

Answer:


main_window = driver.current_window_handle

for window in driver.window_handles:
    if window != main_window:
        driver.switch_to.window(window)

Scroll Page

Answer:


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

Page Object Model (POM) Example

Very Important for Experienced Testers


class LoginPage:

    def __init__(self, driver):
        self.driver = driver

    def enter_username(self, username):
        self.driver.find_element(By.ID,"username").send_keys(username)

    def enter_password(self, password):
        self.driver.find_element(By.ID,"password").send_keys(password)

    def click_login(self):
        self.driver.find_element(By.ID,"login").click()

Why POM matters:
✔ Reusable code
✔ Easy maintenance

Read Data from Excel (Data-Driven Testing)

Common Interview Question


import openpyxl

wb = openpyxl.load_workbook("data.xlsx")
sheet = wb.active

username = sheet["A2"].value
password = sheet["B2"].value

What is Page Object Model?

Answer:

Page Object Model (POM) is a design pattern where:

Each page has separate class
Elements stored in page class
Methods created for actions

Benefits:

Code reusability
Maintainability
Less duplication

What is Hybrid Framework?

Answer:

Hybrid framework combines:

Data-driven testing
Keyword-driven testing
Page Object Model

It provides flexibility and scalability.

Difference Between findElement and findElements?

Answer:

findElement	findElements
Returns single element	Returns list
Throws exception if not found	Returns empty list

What is Stale Element Exception?

Answer:

Occurs when:

Page reloads
DOM changes
Element becomes detached

Solution:

Re-locate element
Use explicit wait

How Do You Handle Dynamic Elements?

Answer:

Methods:

Use dynamic XPath
Use contains()
Use starts-with()

Example:


//input[contains(@id,'username')]

API Testing Scenario (Very Important)

Next I recommend:

👉 Round 3 — API Testing Real-Time Scenarios

Including:

POST request testing
Token authentication
JSON validation
Database validation

Reply:

👉 "Start Round 3 API Testing"

and I’ll continue.

Yes

Great 👍 Now let's start Round 3 — API Testing Real-Time Scenarios (Very Important for your profile since you already work with APIs and databases).

These are real interview questions with strong answers you can use directly.

How Do You Test a POST API? (Very Common)

Question:
How do you test a POST API for user registration?

Answer:

While testing a POST API, I perform the following validations:

Step-by-Step:

1. Verify Request

Check correct endpoint URL
Validate request body format (JSON/XML)
Verify required fields

Example Request:


{
 "username": "testuser",
 "email": "test@gmail.com",
 "password": "Pass@123"
}

2. Verify Response

Status Code → 201 Created
Response body → Verify success message
Validate response structure

Example:


{
 "message": "User created successfully",
 "userId": 101
}

3. Negative Testing

Missing fields
Invalid email format
Duplicate username

4. Database Validation
Verify record created in database:


SELECT *
FROM users
WHERE username='testuser';

How Do You Validate API Response?

Answer:

I validate:

1. Status Code

Examples:

200 → Success
201 → Created
400 → Bad Request
401 → Unauthorized
500 → Server Error

2. Response Body

Validate JSON structure
Check required fields
Validate data correctness

3. Response Time

Verify response time is acceptable (e.g., < 2 seconds).

4. Headers Validation

Check:

Content-Type
Authorization

What is Authentication in API Testing?

Very Frequently Asked

Answer:

Authentication ensures only authorized users access APIs.

Common types:

1. Bearer Token Authentication

Example Header:


Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9

Steps:

Login API generates token
Use token in Authorization header
Access secured APIs

Write Test Cases for Login API

Answer:

Positive Cases:

Valid username and password
Verify status code 200
Verify token generated

Negative Cases:

Invalid username
Invalid password
Blank fields

Edge Cases:

Special characters
Long input values
SQL injection attempt

Difference Between PUT and PATCH

Answer:

PUT	PATCH
Updates full record	Updates partial record
Sends complete data	Sends only changed fields

How Do You Handle Token-Based Authentication?

Answer:

Steps:

Call Login API
Extract token from response
Store token in variable
Use token in header for next API calls

Example Flow:


Login API → Get Token → Use Token → Access Secure API

What is JSON?

Answer:

JSON (JavaScript Object Notation) is a lightweight data format used for data exchange between client and server.

Example:


{
 "name": "Pushkar",
 "role": "Tester"
}

How Do You Perform API Automation?

Answer (Strong Real-Time Answer):

I automate APIs using:

Postman (Manual testing)
Python requests library (Automation)

Example:


import requests

url = "https://api.example.com/login"

data = {
 "username": "testuser",
 "password": "123456"
}

response = requests.post(url, json=data)

print(response.status_code)
print(response.json())

What is Mock API?

Answer:

Mock API simulates actual API behavior.

Used when:

Backend not ready
Integration testing required

Example Tools:

Postman
Swagger

Real-Time Scenario Question

Question:
API returns 200 status code but wrong data. What will you do?

Answer:

Steps:

Validate expected response data
Compare with actual response
Check request parameters
Verify backend logs
Raise defect with:
- Request details
- Response details
- Expected result

What is API Regression Testing?

Answer:

API regression testing ensures:

Existing APIs still work
New changes do not break old APIs

Usually automated.

What is Rate Limiting?

Answer:

Rate limiting restricts number of API requests in a time period.

Example:

100 requests per minute

Test cases:

Send multiple requests
Verify API blocks after limit

How Do You Test an API Without UI?

Answer:

I test APIs directly using:

API documentation (Swagger)
Sending requests via Postman
Validating response
Verifying backend database

Database + Linux (Highly Important)

Next I'll give:

👉 Round 4 — Database + Linux + Real Project Questions

These are very commonly asked in interviews.

Reply:

👉 "Start Round 4 Database Linux"

and we continue.

Python Basics (Very Important)

What You Learn:

Variables
If conditions
Loops
Functions
Lists
Dictionary
File handling

Example — Simple Python Code


name = "Pushkar"

if name == "Pushkar":
    print("Welcome Tester")

Very simple rule:

👉 Python reads line by line

Practice Task

Write program:


print("Hello AI Testing")

AI Basics (Simple Language)

What is AI?

AI = Computer that can think and answer like humans.

Example:

You type:


Generate login test cases

AI gives:


List of test cases

What is an AI Agent?

Very simple:

👉 AI Agent = AI + Tools + Decision

Example:

You type:


Test login page

Agent will:

Read requirement
Generate test cases
Run test
Show result

Prompt Engineering (Very Important)

Prompt = What you ask AI.

Better prompt → Better result.

Bad Prompt


Generate test cases

Good Prompt


Generate login test cases including:
- Positive
- Negative
- Edge cases
- Expected results

Practice Prompt

Try:


Generate test cases for ATM withdrawal

Install Required Tools

We use tools like:

Python
Visual Studio Code
OpenAI API

Install Python

Download from:

👉 python.org

Check installation:


python --version

Your First AI Program

Now we connect Python to AI.

Step 1 — Install Library


pip install openai

Step 2 — First AI Code


from openai import OpenAI

client = OpenAI(api_key="your_api_key")

response = client.responses.create(
    model="gpt-4.1-mini",
    input="Generate test cases for login page"
)

print(response.output_text)

Output Example

AI prints:


Test Case 1: Valid login
Test Case 2: Invalid password
Test Case 3: Empty username

AI Test Case Generator (Real Testing Use)

Now we build real tester tool.

Code Example


requirement = """
Login page should allow user login
with username and password
"""

prompt = f"""
Generate test cases for:
{requirement}

Include:
Positive
Negative
Edge cases
"""

print(prompt)

AI generates:


Valid login
Invalid login
Password empty

Very useful in real testing.

Now we connect AI with automation.

We use:

Selenium

Example Code


from selenium import webdriver

driver = webdriver.Chrome()

driver.get("https://example.com/login")

print("Website Opened")

Now imagine:

AI → Generate test
Selenium → Execute test

That is AI Automation Testing.

AI API Testing

You already work with APIs — this will help a lot.

We use:

Postman
Python requests

Example API Code


import requests

url = "https://api.example.com/login"

data = {
    "username": "test",
    "password": "123"
}

response = requests.post(url, json=data)

print(response.status_code)

AI can generate:

Test data
Test cases
Validation steps

Add Memory to AI Agent

Memory means:

Agent remembers past results.

Example:


Previous login failed
Try different password

Agent learns automatically.

Real Project (Very Important)

Project: AI Testing Assistant

Final Project Flow


Requirement → AI → Test Cases
           ↓
        Selenium
           ↓
        API Testing
           ↓
         Report

This project is resume-ready.

Tuesday, June 16