Parallel test configuration in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable parallel execution of tests in JUnit 5.

JUnit

@Execution(ExecutionMode.[1])
public class MyTests {
    @Test
    void testOne() {
        // test code
    }
}

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

APARALLEL

BSAME_THREAD

CSEQUENTIAL

DCONCURRENT

Attempts:

3 left

💡 Hint

Common Mistakes

Using SAME_THREAD runs tests one after another, not in parallel.

PARALLEL is not a valid ExecutionMode enum value.

Using ExecutionMode.CONCURRENT tells JUnit 5 to run tests in parallel.

2fill in blank

medium

Complete the code to configure the JUnit Platform to run tests in parallel using a properties file.

JUnit

junit.jupiter.execution.parallel.enabled = [1]

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Atrue

Bfalse

Cmaybe

Dauto

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the value to false disables parallel execution.

Using invalid values like 'maybe' or 'auto' causes configuration errors.

Setting junit.jupiter.execution.parallel.enabled to true enables parallel test execution.

3fill in blank

hard

Fix the error in the annotation to correctly set the execution mode for parallel tests.

JUnit

@Execution(ExecutionMode.[1])
public class SampleTest {
    @Test
    void example() {
        // test code
    }
}

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ASEQUENTIAL

BCONCURRENT

CSYNCHRONIZED

DPARALLEL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'PARALLEL' causes a compilation error because it is not defined.

Using 'SYNCHRONIZED' or 'SEQUENTIAL' runs tests one by one.

The correct enum value to enable parallel execution is CONCURRENT. 'PARALLEL' is not a valid value.

4fill in blank

hard

Fill both blanks to configure parallel execution mode and set the default parallelism in junit-platform.properties.

JUnit

junit.jupiter.execution.parallel.mode.default = [1]
junit.jupiter.execution.parallel.config.strategy = [2]

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Aconcurrent

Bfixed

Csequential

Ddynamic

Attempts:

3 left

💡 Hint

Common Mistakes

Setting mode to 'sequential' disables parallelism.

Using 'dynamic' strategy changes thread count at runtime, not fixed.

Setting mode.default to concurrent enables parallel tests by default. The config.strategy set to fixed uses a fixed number of threads.

5fill in blank

hard

Fill all three blanks to create a JUnit 5 test class that runs tests in parallel and uses a custom thread pool size.

JUnit

@Execution(ExecutionMode.[1])
public class ParallelTests {
    @Test
    void testA() {
        // test code
    }
}

// In junit-platform.properties:
junit.jupiter.execution.parallel.enabled = [2]
junit.jupiter.execution.parallel.config.fixed.parallelism = [3]

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

ACONCURRENT

Btrue

C4

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Setting parallel.enabled to false disables parallel tests.

Using SEQUENTIAL mode runs tests one by one.

The annotation uses CONCURRENT to enable parallel tests. The properties file enables parallel execution with true and sets the thread pool size to 4.