White-box testing techniques in Software Engineering - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the type of white-box testing that checks every possible path in a program.

Software Engineering

The testing technique that ensures every possible path is tested is called [1] testing.

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

ABoundary value

BBlack-box

CPath

DUsability

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing path testing with black-box testing.

Thinking boundary value testing covers all paths.

Path testing is a white-box technique that tests all possible execution paths in the code to find errors.

2fill in blank

medium

Complete the code to name the white-box testing technique that checks each decision point for true and false outcomes.

Software Engineering

The white-box testing technique that tests each decision for both true and false outcomes is called [1] coverage.

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

ACondition

BDecision

CFunction

DStatement

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing condition coverage with decision coverage.

Choosing statement coverage instead.

Decision coverage ensures that every decision in the code is tested for both true and false outcomes.

3fill in blank

hard

Fix the error in the description of a white-box testing technique that checks each executable line.

Software Engineering

The technique that tests every executable line in the code is called [1] coverage.

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

ADecision

BPath

CIntegration

DStatement

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing statement coverage with path coverage.

Choosing integration testing which is not white-box.

Statement coverage tests every executable line to ensure all code is run at least once.

4fill in blank

hard

Fill both blanks to complete the description of a white-box testing technique that tests all combinations of conditions in decisions.

Software Engineering

The [1] coverage technique tests all combinations of [2] in decision statements.

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ACondition

BStatement

CConditions

DPath

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing condition coverage with decision coverage.

Using statement coverage terms incorrectly.

Condition coverage tests all possible combinations of conditions within decision statements to ensure thorough testing.

5fill in blank

hard

Fill all three blanks to complete the code snippet describing a white-box testing technique that measures the percentage of code executed.

Software Engineering

Code coverage tools measure [1] coverage by checking which [2] or [3] have been executed during tests.

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

Astatement

Blines

Cbranches

Dfunctions

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing functions with branches in coverage measurement.

Using path coverage instead of statement coverage.

Statement coverage measures how many lines and branches of code have been executed during testing to find untested parts.

Practice

1. Which of the following best describes white-box testing?

easy

A. Testing that examines the internal structure of the code

B. Testing that focuses only on user interface behavior

C. Testing done without knowledge of the code

D. Testing that only checks software performance

Solution

1. Step 1: Understand white-box testing definition

   White-box testing involves looking inside the code to test its logic and structure.

2. Step 2: Compare options to definition

   Testing that examines the internal structure of the code matches this definition exactly, while others focus on external or unrelated aspects.

3. Final Answer:

   Testing that examines the internal structure of the code -> Option A

4. Quick Check:

   White-box testing = internal code check [OK]

Hint: White-box tests look inside the code, not just outside [OK]

Common Mistakes:

• Confusing white-box with black-box testing
• Thinking white-box tests only check UI
• Assuming white-box ignores code structure

2. Which syntax correctly represents a common white-box testing technique?

easy

A. User acceptance testing

B. Branch coverage

C. Load testing

D. Smoke testing

Solution

1. Step 1: Identify white-box testing techniques

   Common white-box techniques include statement, branch, path, and condition coverage.

2. Step 2: Match options to white-box techniques

   Only branch coverage is a white-box technique; others are types of testing but not white-box.

3. Final Answer:

   Branch coverage -> Option B

4. Quick Check:

   Branch coverage = white-box technique [OK]

Hint: Branch coverage is a classic white-box technique [OK]

Common Mistakes:

• Confusing black-box tests with white-box
• Choosing performance or acceptance tests
• Ignoring coverage-based techniques

3. Consider the following code snippet:

if (x > 0) {
  print("Positive");
} else {
  print("Non-positive");
}

Which white-box testing technique ensures both if and else branches are tested?

medium

A. Statement coverage

B. Path coverage

C. Branch coverage

D. Condition coverage

Solution

1. Step 1: Understand the code branches

   The code has two branches: one for x > 0 true, one for false.

2. Step 2: Identify technique testing all branches

   Branch coverage requires testing each branch (if and else) at least once.

3. Final Answer:

   Branch coverage -> Option C

4. Quick Check:

   Branch coverage = test all branches [OK]

Hint: Branch coverage tests all decision paths [OK]

Common Mistakes:

• Confusing statement coverage with branch coverage
• Thinking path coverage is simpler
• Ignoring else branch testing

4. A tester wrote this code to check condition coverage:

if (a > 10 && b < 5) {
  print("Valid");
}

Which mistake would cause incomplete condition coverage?

medium

A. Testing only when both conditions are true

B. Testing when a is 5 and b is 3

C. Testing when a is 15 and b is 6

D. Testing when a is 20 and b is 2

Solution

1. Step 1: Understand condition coverage

   Condition coverage requires testing each condition (a > 10 and b < 5) as true and false separately.

2. Step 2: Analyze testing only both true

   If only tested when both are true, false cases for each condition are not tested, so coverage is incomplete.

3. Final Answer:

   Testing only when both conditions are true -> Option A

4. Quick Check:

   Condition coverage = test each condition true/false [OK]

Hint: Test each condition true and false separately [OK]

Common Mistakes:

• Testing only combined true cases
• Ignoring false condition tests
• Assuming one test covers all conditions

5. You want to ensure every possible route through this code is tested:

if (x > 0) {
  if (y > 0) {
    print("Both positive");
  } else {
    print("x positive, y non-positive");
  }
} else {
  print("x non-positive");
}

Which white-box testing technique best guarantees this?

hard

A. Condition coverage

B. Statement coverage

C. Branch coverage

D. Path coverage

Solution

1. Step 1: Identify all possible paths

   There are three paths: both x and y positive, x positive and y non-positive, x non-positive.

2. Step 2: Understand path coverage

   Path coverage requires testing every possible route through the code, covering all combinations of decisions.

3. Step 3: Compare with other techniques

   Statement and branch coverage do not guarantee all paths; condition coverage tests conditions but not all paths.

4. Final Answer:

   Path coverage -> Option D

5. Quick Check:

   Path coverage = test all routes [OK]

Hint: Path coverage tests every possible route through code [OK]

Common Mistakes:

• Confusing branch with path coverage
• Assuming statement coverage is enough
• Ignoring nested conditions