Authentication testing in Testing Fundamentals - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the login function returns True for valid credentials.

Testing Fundamentals

assert login('user1', 'password123') == [1]

Drag options to blanks, or click blank then click option'

ATrue

BFalse

CNone

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using False instead of True for successful login

Checking for None which means no return value

The login function should return True when the credentials are correct, so the assertion checks for that.

2fill in blank

medium

Complete the code to test that the login function raises an exception for empty username.

Testing Fundamentals

with pytest.raises([1]):
    login('', 'password123')

Drag options to blanks, or click blank then click option'

AKeyError

BValueError

CTypeError

DIndexError

Attempts:

3 left

💡 Hint

Common Mistakes

Using KeyError which is for missing dictionary keys

Using TypeError which is for wrong data types

The login function should raise a ValueError when the username is empty, indicating invalid input.

3fill in blank

hard

Fix the error in the test that checks login failure with wrong password.

Testing Fundamentals

assert login('user1', [1]) == False

Drag options to blanks, or click blank then click option'

A'password123'

BNone

C'wrongpass'

D''

Attempts:

3 left

💡 Hint

Common Mistakes

Using the correct password which makes the test pass incorrectly

Using None which might cause exceptions

The test should use a wrong password like 'wrongpass' to check that login fails and returns False.

4fill in blank

hard

Fill both blanks to create a test that checks if the login function rejects SQL injection attempts.

Testing Fundamentals

assert login([1], [2]) == False

Drag options to blanks, or click blank then click option'

A'admin' OR '1'='1'

B'password123'

C' OR '1'='1'

D'admin'

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the injection string as username instead of password

Using correct credentials which makes the test pass incorrectly

The username is 'admin' and the password is an SQL injection string ' OR '1'='1'. The test checks that login rejects this attack and returns False.

5fill in blank

hard

Fill all three blanks to create a test that verifies the lockout after 3 failed login attempts.

Testing Fundamentals

for _ in range([1]):
    assert login('user2', [2]) == False
assert login('user2', [3]) == 'locked'

Drag options to blanks, or click blank then click option'

A3

B'wrongpass'

C'password123'

D'locked'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the correct password which makes the test pass incorrectly

Using wrong number of attempts in the loop

The test tries to login 3 times with a wrong password 'wrongpass' and expects failure. Then it tries again and expects the account to be 'locked'.

Practice

1. What is the main goal of authentication testing in software testing?

easy

A. To verify that only valid users can access the system

B. To check the speed of the application

C. To test the user interface design

D. To validate database connections

Solution

1. Step 1: Understand authentication testing purpose

   Authentication testing focuses on verifying user identity before granting access.

2. Step 2: Compare options with this purpose

   Only To verify that only valid users can access the system matches this goal; others relate to different testing areas.

3. Final Answer:

   To verify that only valid users can access the system -> Option A

4. Quick Check:

   Authentication testing = verify valid users [OK]

Hint: Authentication = check valid user access [OK]

Common Mistakes:

• Confusing authentication with performance testing
• Thinking authentication tests UI elements
• Mixing authentication with database testing

2. Which of the following is the correct way to test a login form's authentication feature?

easy

A. Enter valid username and password, then check for successful login

B. Click random buttons without entering data

C. Only check if the login button is visible

D. Test the color of the login page background

Solution

1. Step 1: Identify valid test steps for authentication

   Testing authentication requires entering valid credentials and verifying access.

2. Step 2: Evaluate options for correctness

   Enter valid username and password, then check for successful login correctly describes this; others do not test authentication properly.

3. Final Answer:

   Enter valid username and password, then check for successful login -> Option A

4. Quick Check:

   Valid credentials test = successful login [OK]

Hint: Test with valid credentials for login success [OK]

Common Mistakes:

• Ignoring input fields and clicking randomly
• Testing only UI elements without input
• Confusing visual checks with authentication tests

3. Consider this test case for authentication:

Input: username='user1', password='wrongpass'
Expected: Login fails with error message 'Invalid credentials'

What will be the test result if the system allows login with these credentials?

medium

A. Test passes if error message is shown

B. Test passes because login is successful

C. Test is inconclusive without more data

D. Test fails because login should not succeed

Solution

1. Step 1: Analyze expected vs actual behavior

   The test expects login failure with an error message for wrong password.

2. Step 2: Compare actual system behavior

   If login succeeds with wrong password, it contradicts expected behavior, causing test failure.

3. Final Answer:

   Test fails because login should not succeed -> Option D

4. Quick Check:

   Wrong password login = test fail [OK]

Hint: Wrong password must fail login [OK]

Common Mistakes:

• Assuming any login success means pass
• Ignoring expected error messages
• Confusing test pass/fail logic

4. You wrote this test script for authentication:

def test_login():
    username = 'admin'
    password = 'admin123'
    result = login(username, password)
    assert result == False

What is the error in this test?

medium

A. The password variable is empty

B. The username variable is not defined

C. The assertion expects login to fail but credentials are valid

D. The login function is missing parentheses

Solution

1. Step 1: Understand test intent and data

   Username and password appear valid, so login should succeed (True).

2. Step 2: Check assertion correctness

   Assertion expects False (failure), which contradicts valid credentials, causing test error.

3. Final Answer:

   The assertion expects login to fail but credentials are valid -> Option C

4. Quick Check:

   Valid credentials expect True, not False [OK]

Hint: Match assertion with expected login result [OK]

Common Mistakes:

• Asserting wrong expected result
• Assuming variables undefined without checking
• Confusing function call syntax

5. You want to test a system that locks a user account after 3 failed login attempts. Which test case best verifies this feature?

hard

A. Login once with correct password and check access

B. Attempt login 3 times with wrong password, then check if account is locked

C. Try logging in with empty username and password

D. Check if password reset link is visible on login page

Solution

1. Step 1: Identify feature to test

   The feature locks account after 3 failed login attempts.

2. Step 2: Select test case matching feature

   Attempt login 3 times with wrong password, then check if account is locked tests exactly this by failing login 3 times and checking lock status.

3. Final Answer:

   Attempt login 3 times with wrong password, then check if account is locked -> Option B

4. Quick Check:

   3 failed attempts = account lock test [OK]

Hint: Test lock by 3 failed logins [OK]

Common Mistakes:

• Testing unrelated features like password reset
• Using correct password instead of failed attempts
• Ignoring the number of failed attempts