Use case testing in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identifying Use Case Testing Purpose

What is the main purpose of use case testing in software quality assurance?

A To check the software's performance under heavy load

B To test the internal code structure and logic paths of the software

C To find security vulnerabilities by simulating attacks

D To verify the system behaves correctly for all possible user interactions described in use cases

💡 Hint

Think about what use cases describe and what testing them ensures.

Use case testing focuses on validating the system's behavior from the user's perspective, ensuring all user scenarios work as expected.

❓ Predict Output

intermediate

Output of Use Case Test Scenario Execution

Given a use case test scenario that logs steps executed, what will be the output after running this test?

Testing Fundamentals

steps_executed = []

use_case_steps = ['Login', 'Select Item', 'Add to Cart', 'Checkout']

for step in use_case_steps:
    steps_executed.append(f"Executed: {step}")

print(steps_executed)

A ["Executed: Login", "Executed: Select Item", "Executed: Add to Cart", "Executed: Checkout"]

B ["Login", "Select Item", "Add to Cart", "Checkout"]

C ["Executed Login", "Executed Select Item", "Executed Add to Cart", "Executed Checkout"]

D SyntaxError: invalid syntax

💡 Hint

Look at how strings are formatted inside the loop.

The code appends strings with the prefix 'Executed: ' followed by each step name, so the output list contains these formatted strings.

❓ assertion

advanced

Correct Assertion for Use Case Test Result

Which assertion correctly verifies that a use case test returned the expected success message?

Testing Fundamentals

def test_use_case_result():
    result = run_use_case_test()
    expected_message = "Use case executed successfully"
    # Choose the correct assertion below

A assert result == expected_message

B assert result != expected_message

C assert result is None

D assert result > expected_message

💡 Hint

The assertion should confirm the result matches the expected message exactly.

Using assert result == expected_message checks that the test output matches the expected success message exactly, which is the correct way to verify test success.

🔧 Debug

advanced

Debugging a Use Case Test Failure

Consider this use case test code snippet. It fails unexpectedly. What is the cause of failure?

Testing Fundamentals

def test_login_use_case():
    user_input = {'username': 'user1', 'password': 'pass123'}
    response = login(user_input)
    assert response.status_code == 200  # Line with error

A NameError because 'login' function is undefined

B SyntaxError due to using '=' instead of '==' in the assertion

C AssertionError because status_code is not 200

D TypeError because response.status_code is not an integer

💡 Hint

Check the assertion syntax carefully.

The assertion uses a single '=' which is assignment, not comparison. This causes a SyntaxError.

❓ framework

expert

Best Practice for Organizing Use Case Tests in a Framework

In a test automation framework, how should use case tests be organized for clarity and maintainability?

A Mix use case tests with unrelated unit tests in the same test files

B Put all use case tests in a single large file regardless of use case

C Group tests by use case names in separate test classes or files, each containing all related scenarios

D Write use case tests only as manual test scripts, not automated

💡 Hint

Think about how grouping helps when tests grow in number.

Organizing tests by use case in separate classes or files improves readability, maintenance, and helps testers find related tests easily.

Practice

1. What is the main purpose of use case testing in software testing?

easy

A. To find syntax errors in the source code

B. To verify software behavior by simulating real user actions step-by-step

C. To test only the software's performance under load

D. To check the software's internal code structure

Solution

1. Step 1: Understand use case testing focus

   Use case testing simulates how users interact with software in real scenarios.

2. Step 2: Compare options to definition

   Only To verify software behavior by simulating real user actions step-by-step describes testing by following user actions step-by-step.

3. Final Answer:

   To verify software behavior by simulating real user actions step-by-step -> Option B

4. Quick Check:

   Use case testing = user action simulation [OK]

Hint: Think: Does it test user steps or internal code? [OK]

Common Mistakes:

• Confusing use case testing with code structure testing
• Thinking it tests performance or syntax only
• Ignoring the step-by-step user action focus

2. Which of the following is the correct way to write a use case test step?

easy

A. User logs in with valid username and password.

B. Check if login button is blue.

C. Verify database connection string.

D. Run performance test for login page.

Solution

1. Step 1: Identify use case test step format

   Use case steps describe user actions in simple sentences.

2. Step 2: Match options to format

   User logs in with valid username and password. describes a user action clearly; others focus on UI color, backend, or performance.

3. Final Answer:

   User logs in with valid username and password. -> Option A

4. Quick Check:

   Use case step = user action sentence [OK]

Hint: Look for user action description, not technical checks [OK]

Common Mistakes:

• Choosing UI or backend checks as use case steps
• Confusing performance tests with use case steps
• Writing vague or non-action statements

3. Given this use case test step: User enters invalid password and clicks login, what is the expected result?

medium

A. Application crashes.

B. User is logged in successfully.

C. Error message 'Invalid password' is shown.

D. Password field clears automatically.

Solution

1. Step 1: Analyze the test step

   The user enters an invalid password and tries to log in.

2. Step 2: Determine expected behavior

   The system should reject invalid passwords and show an error message.

3. Final Answer:

   Error message 'Invalid password' is shown. -> Option C

4. Quick Check:

   Invalid input = error message shown [OK]

Hint: Invalid input usually triggers error messages [OK]

Common Mistakes:

• Assuming invalid input logs in user
• Expecting app crash on invalid input
• Thinking fields clear automatically without prompt

4. A use case test step says: User clicks 'Submit' without filling required fields. The test fails because the form submits anyway. What is the likely error?

medium

A. The validation step for required fields is missing or incorrect.

B. The submit button is disabled.

C. The user entered all fields correctly.

D. The form resets after submission.

Solution

1. Step 1: Understand the failure

   The form submits even when required fields are empty, which is wrong.

2. Step 2: Identify cause

   Missing or faulty validation allows submission without required data.

3. Final Answer:

   The validation step for required fields is missing or incorrect. -> Option A

4. Quick Check:

   Missing validation = form submits wrongly [OK]

Hint: Check if validation steps exist for required fields [OK]

Common Mistakes:

• Assuming submit button disables automatically
• Ignoring missing validation logic
• Confusing form reset with submission failure

5. You have a use case testing scenario for an online store checkout:
1. User adds item to cart
2. User proceeds to checkout
3. User enters invalid credit card number
4. User clicks 'Pay'
Which expected result best fits this use case test?

hard

A. Payment is processed successfully.

B. Cart is emptied automatically.

C. User is redirected to homepage without message.

D. Error message 'Invalid credit card number' is displayed and payment is blocked.

Solution

1. Step 1: Review the scenario steps

   User tries to pay with an invalid credit card number.

2. Step 2: Determine correct system response

   The system should block payment and show an error about the invalid card.

3. Final Answer:

   Error message 'Invalid credit card number' is displayed and payment is blocked. -> Option D

4. Quick Check:

   Invalid payment info = error shown, payment blocked [OK]

Hint: Invalid payment info must trigger error and block payment [OK]

Common Mistakes:

• Assuming payment succeeds with invalid data
• Expecting silent redirects without messages
• Thinking cart empties on failed payment