Condition coverage in Testing Fundamentals - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the number is positive.

Testing Fundamentals

def is_positive(num):
    if num [1] 0:
        return True
    else:
        return False

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

A>

B!=

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '>' will only check if the number equals zero.

Using '<' checks for negative numbers, not positive.

The condition num > 0 correctly checks if the number is positive.

2fill in blank

medium

Complete the code to test if a string is empty.

Testing Fundamentals

def is_empty(s):
    if len(s) [1] 0:
        return True
    else:
        return False

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

A!=

B>

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' would check if the string is not empty.

Using '>' or '<' would not correctly identify an empty string.

The condition len(s) == 0 checks if the string has no characters, meaning it is empty.

3fill in blank

hard

Fix the error in the condition to check if a number is even.

Testing Fundamentals

def is_even(n):
    if n [1] 2 == 0:
        return True
    else:
        return False

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

A+

B//

C*

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Using '//' performs integer division, not remainder.

Using '*' or '+' are arithmetic operations that don't check evenness.

The modulo operator % returns the remainder. n % 2 == 0 checks if the number is even.

4fill in blank

hard

Fill both blanks to create a condition that checks if a number is between 10 and 20 inclusive.

Testing Fundamentals

def in_range(x):
    if x [1]= 10 and x [2]= 20:
        return True
    else:
        return False

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

A>

B<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '<=' excludes 20 from the range.

Using '>' instead of '>=' excludes 10 from the range.

The condition x >= 10 and x <= 20 checks if x is between 10 and 20 inclusive.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

Testing Fundamentals

words = ['apple', 'bat', 'carrot', 'dog']
lengths = { [1]: [2] for word in words if [3] > 3 }

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

Aword

Blen(word)

Attempts:

3 left

💡 Hint

Common Mistakes

Using the length as the key instead of the word.

Not using the length in the condition to filter words.

The dictionary comprehension maps each word to its length len(word) only if the length is greater than 3.

Practice

1. What does condition coverage ensure in software testing?

easy

A. All possible input values are tested

B. Only the overall decision outcome is tested once

C. Each part of a decision is tested for both true and false outcomes

D. Only syntax errors are detected

Solution

1. Step 1: Understand condition coverage definition

   Condition coverage requires testing each atomic condition in a decision for both true and false values.

2. Step 2: Compare options with definition

   Each part of a decision is tested for both true and false outcomes matches this definition exactly, while others describe different testing scopes.

3. Final Answer:

   Each part of a decision is tested for both true and false outcomes -> Option C

4. Quick Check:

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

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

Common Mistakes:

• Confusing condition coverage with decision coverage
• Thinking only overall decision outcome matters
• Assuming all inputs must be tested

2. Which of the following is the correct syntax to represent a condition in a test case for condition coverage?

easy

A. if a and b then ...

B. if a && b { ... }

C. if (a & b) { ... }

D. if (a && b) { ... }

Solution

1. Step 1: Identify correct syntax for logical AND in common languages

   In languages like JavaScript, Java, and C, logical AND is written as && inside parentheses.

2. Step 2: Evaluate each option

   if (a && b) { ... } uses correct syntax with parentheses and &&. if a and b then ... uses incorrect syntax (no parentheses, wrong keywords). if (a & b) { ... } uses bitwise AND &, not logical AND. if a && b { ... } misses parentheses.

3. Final Answer:

   if (a && b) { ... } -> Option D

4. Quick Check:

   Logical AND syntax = && with parentheses [OK]

Hint: Use parentheses and && for logical AND [OK]

Common Mistakes:

• Using single & instead of && for logical AND
• Omitting parentheses around conditions
• Using incorrect keywords like 'then'

3. Consider the decision: if (x > 0 && y == 5). Which test inputs achieve full condition coverage?

medium

A. x=1, y=5 and x=-1, y=4

B. x=1, y=5 and x=1, y=4

C. x=0, y=5 and x=1, y=5

D. x=1, y=5 and x=-1, y=5

Solution

1. Step 1: Identify conditions and their true/false values

   Conditions: (x > 0) and (y == 5). To cover both true and false for each, we need inputs where x > 0 is true and false, and y == 5 is true and false.

2. Step 2: Check each option for condition coverage

   x=1, y=5 and x=-1, y=4: x=1,y=5 (x>0 true, y==5 true), x=-1,y=4 (x>0 false, y==5 false) covers all true/false for both conditions. Others miss some false cases.

3. Final Answer:

   x=1, y=5 and x=-1, y=4 -> Option A

4. Quick Check:

   Test each condition true and false separately [OK]

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

Common Mistakes:

• Testing only overall decision true/false
• Missing false case for one condition
• Assuming one test covers all conditions

4. Given the code snippet:

if (a || b) {
  // do something
}

Which test set achieves condition coverage?

medium

A. a=true, b=false and a=false, b=true

B. a=true, b=false and a=false, b=false

C. a=true, b=true only

D. a=false, b=false only

Solution

1. Step 1: Understand condition coverage for OR operator

   For a || b, condition coverage requires testing a and b each as true and false separately.

2. Step 2: Evaluate test sets

   a=true, b=false and a=false, b=true tests a=true,b=false (a true, b false) and a=false,b=true (a false, b true), covering both true and false for each condition. Others miss some cases.

3. Final Answer:

   a=true, b=false and a=false, b=true -> Option A

4. Quick Check:

   Test each condition true and false separately [OK]

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

Common Mistakes:

• Confusing with decision coverage
• Assuming one test covers both conditions
• Ignoring condition coverage for OR

5. You have the decision: if ((p && q) || r). Which minimal test set achieves full condition coverage?

hard

A. p=true, q=true, r=false; p=false, q=true, r=false; p=false, q=false, r=false

B. p=true, q=false, r=false; p=false, q=true, r=false; p=false, q=false, r=true

C. p=true, q=true, r=false; p=false, q=false, r=false

D. p=true, q=false, r=true; p=false, q=false, r=false

Solution

1. Step 1: Identify atomic conditions and their true/false needs

   Conditions: p, q, r. Condition coverage requires each to be true and false at least once.

2. Step 2: Check each test set for coverage

   p=true, q=false, r=false; p=false, q=true, r=false; p=false, q=false, r=true tests p=true,q=false,r=false (p true, q false, r false), p=false,q=true,r=false (p false, q true, r false), and p=false,q=false,r=true (p false, q false, r true). This covers true and false for all conditions minimally.

3. Final Answer:

   p=true, q=false, r=false; p=false, q=true, r=false; p=false, q=false, r=true -> Option B

4. Quick Check:

   Each condition true and false tested once [OK]

Hint: Test each condition true and false once in minimal sets [OK]

Common Mistakes:

• Missing false case for one condition
• Testing only overall decision outcomes
• Using redundant tests beyond minimal coverage