Spring Boot @SpringBootTest in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to annotate the test class for Spring Boot integration testing.

JUnit

@[1]
public class MyServiceTest {
    // test methods
}

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ASpringBootTest

BAutowired

CComponent

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Autowired instead of @SpringBootTest on the test class

Forgetting the @SpringBootTest annotation causes tests to run without Spring context

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

2fill in blank

medium

Complete the code to inject a service bean into the test class.

JUnit

@SpringBootTest
public class MyServiceTest {
    @[1]
    private MyService myService;
}

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AComponent

BService

CAutowired

DInject

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Service instead of @Autowired for injection

Not annotating the field causes NullPointerException in tests

The @Autowired annotation tells Spring to inject the MyService bean into the test class.

3fill in blank

hard

Fix the error in the test method to assert the service returns the expected value.

JUnit

@SpringBootTest
public class MyServiceTest {
    @Autowired
    private MyService myService;

    @Test
    public void testGetValue() {
        String result = myService.getValue();
        assertEquals([1], result);
    }
}

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AexpectedValue

B"expectedValue"

Cresult

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a variable name without quotes instead of a string literal

Swapping expected and actual arguments in assertEquals

The expected value in assertEquals must be a string literal matching the expected output, so it needs quotes.

4fill in blank

hard

Fill both blanks to create a test that checks if the application context loads successfully.

JUnit

@SpringBootTest
public class ApplicationContextTest {

    @Test
    public void contextLoads() {
        [1] context = new [2]();
        assertNotNull(context);
    }
}

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AApplicationContext

BMyService

CApplicationContextRunner

DApplicationContextTest

Attempts:

3 left

💡 Hint

Common Mistakes

Using the test class name as a type or constructor

Using a service class instead of context classes

ApplicationContextRunner is used to create and run an application context in tests, and ApplicationContext is the interface type.

5fill in blank

hard

Fill all three blanks to write a test that verifies a bean is present in the application context.

JUnit

@SpringBootTest
public class BeanPresenceTest {

    @Autowired
    private ApplicationContext [1];

    @Test
    public void testBeanExists() {
        boolean exists = [1].containsBean([2]);
        assertTrue(exists, "Bean should be present");
    }

    private String [3]() {
        return "myService";
    }
}

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Acontext

B"myService"

CgetBeanName

DmyService

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a variable without quotes as bean name

Using inconsistent variable names for context

Not returning the correct bean name string

The ApplicationContext is injected as 'context', the bean name is passed as a string literal, and the method getBeanName returns the bean name string.