Why testing matters in Spring Boot - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a simple Spring Boot test class.

Spring Boot

import org.springframework.boot.test.context.[1];

@[1]
public class ApplicationTests {

}

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

ASpringBootTest

BComponent

CService

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @SpringBootTest for test classes

Forgetting to import the correct annotation

The @SpringBootTest annotation tells Spring Boot to look for a main configuration class and start the application context for testing.

2fill in blank

medium

Complete the code to write a test method that checks if the application context loads.

Spring Boot

@Test
public void context[1]() {
    // test body can be empty
}

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AStarts

BLoads

CRuns

DChecks

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that don't reflect the test purpose

Leaving out the @Test annotation

The method name contextLoads is a common convention in Spring Boot tests to verify the application context starts without errors.

3fill in blank

hard

Fix the error in the test annotation import statement.

Spring Boot

import org.junit.jupiter.api.[1];

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

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ATestCase

BTestMethod

CTestAnnotation

DTest

Attempts:

3 left

💡 Hint

Common Mistakes

Using JUnit 4 imports with JUnit 5 annotations

Misspelling the annotation name

The correct import for JUnit 5 test methods is org.junit.jupiter.api.Test. This annotation marks a method as a test.

4fill in blank

hard

Fill both blanks to create a test that asserts two values are equal.

Spring Boot

@Test
public void testSum() {
    int result = 2 + 3;
    [1].assert[2](5, result);
}

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AAssertions

BassertEquals

CassertTrue

DAssert

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertTrue instead of assertEquals for equality checks

Using Assert instead of Assertions in JUnit 5

Use Assertions.assertEquals(expected, actual) to check if two values are equal in JUnit 5.

5fill in blank

hard

Fill all three blanks to write a test that verifies a service method returns the expected string.

Spring Boot

import static org.junit.jupiter.api.Assertions.[1];

@Test
public void testGreeting() {
    MyService service = new MyService();
    String greeting = service.[2]();
    [3]("Hello, World!", greeting);
}

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

AassertEquals

BgetGreeting

CassertTrue

DsayHello

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertTrue instead of assertEquals for string comparison

Calling a non-existent method on the service

The test imports assertEquals to compare expected and actual values. It calls getGreeting() on the service and asserts the result equals "Hello, World!".