Reading test data from JSON in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of reading JSON test data in Selenium Python

What will be the output of the following code snippet that reads test data from a JSON file and prints the username?

Selenium Python

import json
with open('testdata.json', 'r') as file:
    data = json.load(file)
print(data['user']['username'])

A admin_user

B KeyError

C TypeError

D FileNotFoundError

💡 Hint

Check the JSON structure and the key used to access the username.

The code reads the JSON file and accesses the nested key 'user' then 'username'. If the JSON file contains {"user": {"username": "admin_user"}}, it prints 'admin_user'.

❓ assertion

intermediate

Correct assertion for JSON test data in Selenium Python

Which assertion correctly verifies that the password read from JSON test data equals 'pass123'?

Selenium Python

import json
with open('testdata.json', 'r') as file:
    data = json.load(file)
password = data['user']['password']

A assert password = 'pass123'

B assertEqual(password, 'pass123')

C assert password == 'pass123'

D assert password != 'pass123'

💡 Hint

Remember the correct syntax for assertions in Python.

Option C uses the correct Python assert statement syntax to check equality. Option C uses assignment instead of comparison, causing a syntax error. Option C is a unittest method but not used standalone. Option C asserts inequality, which is incorrect.

❓ locator

advanced

Best locator to use with JSON test data for Selenium Python

Given JSON test data contains a field 'login_button_id' with value 'btnLogin'. Which locator is best to find the login button in Selenium Python?

Selenium Python

login_button_id = data['login_button_id']

A driver.find_element(By.NAME, login_button_id)

B driver.find_element(By.CLASS_NAME, login_button_id)

C driver.find_element(By.XPATH, login_button_id)

D driver.find_element(By.ID, login_button_id)

💡 Hint

Consider the type of locator that matches an element's id attribute.

Since the JSON field contains the id of the button, using By.ID with that value is the most direct and reliable locator. Other options use different attributes that may not match the id value.

🔧 Debug

advanced

Identify the error when reading JSON test data

What error will this code raise if the JSON file is empty or malformed? import json with open('testdata.json', 'r') as file: data = json.load(file) print(data)

A FileNotFoundError

B json.decoder.JSONDecodeError

C KeyError

D TypeError

💡 Hint

Think about what happens when json.load tries to parse invalid JSON.

If the JSON file is empty or malformed, json.load raises JSONDecodeError indicating it cannot parse the content. FileNotFoundError occurs if the file is missing, KeyError if accessing missing keys, TypeError if wrong types are used.

❓ framework

expert

Best practice for integrating JSON test data in Selenium Python tests

Which approach best integrates JSON test data into Selenium Python tests for maintainability and reusability?

A Load JSON data once in a fixture or setup method and pass it to test functions

B Read the JSON file inside every test function separately

C Use global variables to store JSON data and access them anywhere

D Hardcode test data inside test functions instead of JSON

💡 Hint

Think about avoiding repeated file reads and keeping tests clean.

Loading JSON data once in a fixture or setup method improves efficiency and keeps tests clean and maintainable. Reading JSON in every test causes redundancy and slows tests. Hardcoding data reduces flexibility. Global variables can cause side effects and are discouraged.