assertTrue and assertFalse in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assert that the condition is true.

JUnit

assert[1](isValid);

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

AFalse

BTrue

CEquals

DNull

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertFalse instead of assertTrue

Using assertEquals for boolean conditions

The assertTrue method checks that the condition is true. If it is false, the test fails.

2fill in blank

medium

Complete the code to assert that the condition is false.

JUnit

assert[1](isEmpty);

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

ATrue

BNotNull

CFalse

DSame

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertTrue instead of assertFalse

Using assertNull for boolean checks

The assertFalse method checks that the condition is false. If it is true, the test fails.

3fill in blank

hard

Fix the error in the assertion method to check if the user is logged in.

JUnit

assert[1](user.isLoggedIn());

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

ANotEquals

BFalse

CNull

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertFalse which expects false condition

Using assertNull which is for null checks

To check if the user is logged in, the condition should be true, so use assertTrue.

4fill in blank

hard

Fill both blanks to assert that the list is empty and the flag is false.

JUnit

assert[1](list.isEmpty());
assert[2](flag);

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

ATrue

BFalse

CEquals

DNull

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping assertTrue and assertFalse

Using assertEquals for boolean checks

The first assertion checks if the list is empty (true), so use assertTrue. The second checks if the flag is false, so use assertFalse.

5fill in blank

hard

Fill all three blanks to assert that the user is active, the count is zero, and the error flag is false.

JUnit

assert[1](user.isActive());
assertEquals([2], count);
assert[3](errorFlag);

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

ATrue

B0

CFalse

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong assertion methods for boolean checks

Using wrong expected value in assertEquals

Use assertTrue to check if the user is active (true). The count should be zero, so use 0 in assertEquals. The error flag should be false, so use assertFalse.