IDE integration (IntelliJ, Eclipse) in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the JUnit test annotation.

JUnit

import org.junit.[1];

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AIgnore

BBefore

CAfter

DTest

Attempts:

3 left

💡 Hint

Common Mistakes

Importing @Before or @After instead of @Test

Forgetting to import any annotation

The @Test annotation marks a method as a test method in JUnit.

2fill in blank

medium

Complete the code to create a test method named testAddition.

JUnit

@Test
public void [1]() {
    // test code here
}

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AtestAddition

BadditionTest

CaddTest

DcheckAddition

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that don't start with 'test'

Using invalid Java method names

By convention, test methods often start with 'test' followed by the feature name, like testAddition.

3fill in blank

hard

Fix the error in the assertion to check if sum equals 5.

JUnit

int sum = 2 + 3;
assertEquals([1], sum);

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A5

Bsum

C"5"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using the actual value as expected

Using a string instead of an integer

The expected value should be the integer 5, not the variable sum or a string.

4fill in blank

hard

Fill both blanks to import the assertion and write a failing test method.

JUnit

import static org.junit.Assert.[1];

@Test
public void testFail() {
    [2]("Failing test");
}

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Afail

BassertTrue

DassertEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Importing assertTrue but calling fail

Calling assertEquals instead of fail

The fail method from JUnit causes the test to fail immediately with a message.

5fill in blank

hard

Fill all three blanks to write a test that checks if a list contains a value.

JUnit

import static org.junit.Assert.[1];
import java.util.List;

@Test
public void testListContains() {
    List<String> items = List.of("apple", "banana", "cherry");
    boolean contains = items.contains("banana");
    [2]("List should contain banana", contains);
    [3](true, contains);
}

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

AassertTrue

BassertFalse

DassertEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertFalse instead of assertTrue

Mixing up assertTrue and assertEquals

Use assertTrue to check the condition is true, and assertEquals to compare expected and actual values.