@EnabledOnJre for JRE-specific tests in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable the test only on Java 17.

JUnit

@EnabledOnJre({JRE.[1])
void testFeature() {
    // test code here
}

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

AJAVA_11

BJAVA_17

CJAVA_8

DJAVA_19

Attempts:

3 left

💡 Hint

Common Mistakes

Using a Java version constant that does not match the intended JRE version.

Forgetting to import the JRE enum.

The @EnabledOnJre annotation uses JRE constants like JAVA_17 to specify the Java version for which the test runs.

2fill in blank

medium

Complete the code to enable the test only on Java 11 and Java 17.

JUnit

@EnabledOnJre({JRE.JAVA_11, JRE.[1])
void testMultipleVersions() {
    // test code here
}

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

AJAVA_8

BJAVA_19

CJAVA_15

DJAVA_17

Attempts:

3 left

💡 Hint

Common Mistakes

Using a version not supported or not intended for the test.

Syntax errors in the array of JRE versions.

You can specify multiple JRE versions in the @EnabledOnJre annotation by listing them in the array.

3fill in blank

hard

Fix the error in the annotation to correctly enable the test on Java 8.

JUnit

@EnabledOnJre(JRE.[1])
void testLegacySupport() {
    // test code here
}

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

AJAVA8

BJAVA-8

CJAVA_8

DJAVA8_

Attempts:

3 left

💡 Hint

Common Mistakes

Using JAVA8 without underscore causes a compile error.

Using hyphens or trailing underscores is invalid.

The correct enum constant for Java 8 is JAVA_8 with an underscore, not JAVA8 or other variants.

4fill in blank

hard

Fill both blanks to enable the test only on Java 15 or Java 19.

JUnit

@EnabledOnJre({JRE.[1], JRE.[2])
void testFutureVersions() {
    // test code here
}

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

AJAVA_15

BJAVA_11

CJAVA_19

DJAVA_8

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing older versions like Java 8 or 11 when the test targets newer versions.

Syntax errors in the array notation.

The test is enabled on Java 15 and Java 19 by listing both versions in the annotation array.

5fill in blank

hard

Fill all three blanks to enable the test on Java 8, Java 11, and Java 17.

JUnit

@EnabledOnJre({JRE.[1], JRE.[2], JRE.[3])
void testMultipleLTS() {
    // test code here
}

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

AJAVA_8

BJAVA_11

CJAVA_17

DJAVA_19

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to close the array with a closing brace.

Using incorrect enum constants or missing commas.

The annotation enables the test on three LTS Java versions by listing them all in the array.