Data validation rules in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Data Validation Purpose

Why is data validation important in software testing?

A To check that input data meets required formats and rules before processing

B To ensure the software accepts all types of data without restrictions

C To speed up the software by skipping input checks

D To allow users to enter any data to test software flexibility

💡 Hint

Think about what happens if wrong data is processed by software.

Data validation ensures inputs are correct and safe before software uses them, preventing errors and security issues.

❓ Predict Output

intermediate

Output of Validation Function

What is the output of this Python validation function when input is 'abc123'?

Testing Fundamentals

def is_alphanumeric(s):
    return s.isalnum()

result = is_alphanumeric('abc123')
print(result)

A None

B False

C True

D SyntaxError

💡 Hint

Check what isalnum() returns for letters and numbers combined.

The isalnum() method returns True if all characters are letters or numbers, which 'abc123' is.

❓ assertion

advanced

Correct Assertion for Email Validation

Which assertion correctly tests that the email validation function rejects an invalid email?

Testing Fundamentals

def validate_email(email):
    import re
    pattern = r'^[\w\.-]+@[\w\.-]+\.\w+$'
    return bool(re.match(pattern, email))

A assert validate_email('user@domain') == True

B assert validate_email('user@domain') == False

C assert validate_email('[e-mail]') == False

D assert validate_email('userdomain.com') == True

💡 Hint

Consider if 'user@domain' is a valid email format.

'user@domain' lacks a top-level domain like '.com', so validation should fail and return False.

🔧 Debug

advanced

Find the Bug in Validation Code

What error will this JavaScript code produce when validating a number input?

Testing Fundamentals

function validateNumber(input) {
  if (typeof input === 'number' && input > 0) {
    return true;
  } else {
    return false;
  }
}

console.log(validateNumber('5'));

A Returns false

B Returns true

C Throws TypeError

D Returns undefined

💡 Hint

Check the type of the input '5' (string) compared to number.

The input is a string '5', so typeof input === 'number' is false, returning false.

❓ framework

expert

Choosing Best Locator for Validation Error Message

In automated UI testing, which locator is best to find a validation error message that appears below an input field with id 'username'?

A By.id('username')

B By.tagName('span')

C By.className('error')

D By.xpath("//input[@id='username']/following-sibling::span[@class='error']")

💡 Hint

Think about locating the error message specifically related to the username input.

Option D precisely locates the span with class 'error' that is a sibling of the input with id 'username', ensuring correct element selection.