Why CI integration enables continuous quality in JUnit - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a simple JUnit test method.

JUnit

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class CalculatorTest {
    @Test
    public void testAddition() {
        int result = 2 + 3;
        assertEquals([1], result);
    }
}

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

A7

B6

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong expected value in assertEquals.

Confusing actual and expected parameters.

The sum of 2 and 3 is 5, so assertEquals should check for 5.

2fill in blank

medium

Complete the code to annotate a method as a JUnit test.

JUnit

import org.junit.jupiter.api.Test;

public class SampleTest {
    [1]
    public void sampleMethod() {
        // test code here
    }
}

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

A@BeforeEach

B@Disabled

C@Test

D@AfterAll

Attempts:

3 left

💡 Hint

Common Mistakes

Using setup or teardown annotations instead of @Test.

Forgetting to annotate the test method.

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

3fill in blank

hard

Fix the error in the assertion to correctly check string equality.

JUnit

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class StringTest {
    @Test
    public void testGreeting() {
        String greeting = "Hello";
        assertEquals([1], greeting);
    }
}

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

A"Hello"

B"hello"

Cgreeting.toLowerCase()

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different case in the expected string.

Passing null or unrelated strings.

The expected value must exactly match the actual string "Hello" for the test to pass.

4fill in blank

hard

Fill both blanks to create a test that fails if the number is not positive.

JUnit

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class NumberTest {
    @Test
    public void testPositive() {
        int number = -5;
        assertTrue(number [1] [2]);
    }
}

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

A>

B0

C<

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than instead of greater than.

Comparing to -1 instead of 0.

The test checks that number is greater than 0 to ensure it is positive.

5fill in blank

hard

Fill all three blanks to create a test that checks if a list contains a specific element.

JUnit

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.List;

public class ListTest {
    @Test
    public void testContains() {
        List<String> fruits = List.of("apple", "banana", "cherry");
        assertTrue(fruits.[1]([2]), "List should contain [3].");
    }
}

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

Acontains

B"banana"

Cbanana

D"apple"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the element without quotes causing a compile error.

Using the wrong method name.

Mismatch between the element checked and the message.

The method 'contains' checks if the list has the string "banana". The message also uses "banana".