Timeout annotations in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a timeout of 100 milliseconds on the test method.

JUnit

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

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

A10

B1000

C100

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1000 instead of 100 causes longer timeout than intended.

Omitting the @Timeout annotation means no timeout is set.

The @Timeout annotation takes the timeout duration in milliseconds. Here, 100 means the test must finish within 100 ms.

2fill in blank

medium

Complete the code to import the Timeout annotation from JUnit Jupiter.

JUnit

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

public class MyTests {
    @Test
    @Timeout(200)
    void testMethod() {}
}

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

ATest

BAfterAll

CBeforeEach

DTimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Importing @Test instead of @Timeout.

Using annotations from other packages.

The Timeout annotation is imported from org.junit.jupiter.api.Timeout to set time limits on tests.

3fill in blank

hard

Fix the error in the timeout annotation usage to specify the time unit as seconds.

JUnit

@Test
@Timeout(value = 2, unit = [1])
void testWithSecondsTimeout() {
    // test code
}

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

AChronoUnit.SECONDS

BTimeUnit.SECONDS

CTimeUnit.MILLISECONDS

DDuration.SECONDS

Attempts:

3 left

💡 Hint

Common Mistakes

Using ChronoUnit which is for date/time, not Timeout.

Using Duration.SECONDS which does not exist.

The Timeout annotation uses java.util.concurrent.TimeUnit to specify the time unit. Use TimeUnit.SECONDS for seconds.

4fill in blank

hard

Fill both blanks to set a timeout of 500 milliseconds using the Timeout annotation with explicit value and unit.

JUnit

@Test
@Timeout(value = [1], unit = [2])
void testHalfSecondTimeout() {
    // test code
}

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

A500

B1000

CTimeUnit.MILLISECONDS

DTimeUnit.SECONDS

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up value and unit parameters.

Using seconds unit with 500 value expecting milliseconds.

Set value to 500 and unit to TimeUnit.MILLISECONDS to specify a 500 ms timeout.

5fill in blank

hard

Fill all three blanks to create a test method with a 3-second timeout and a descriptive display name.

JUnit

@Test
@Timeout(value = [1], unit = [2])
@DisplayName([3])
void testTimeoutWithName() {
    // test code
}

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

A3

BTimeUnit.SECONDS

C"Test with 3 seconds timeout"

D"Timeout test"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect unit for timeout.

Forgetting quotes around display name string.

Set value to 3, unit to TimeUnit.SECONDS, and display name to "Test with 3 seconds timeout" for clarity.