Prev Next

Testing / JUnit6 Interview Questions

What is conditional test execution in JUnit 6 and what built-in conditions are available?

JUnit 6 provides condition annotations that skip or enable tests based on runtime conditions without writing assumption code inside the test body. These are implemented as extensions using the ExecutionCondition interface.

Built-in condition annotations
AnnotationSkips test when...
@EnabledOnOs / @DisabledOnOsRunning on a specific OS (e.g. WINDOWS, LINUX, MAC)
@EnabledOnJre / @DisabledOnJreRunning on a specific Java version range
@EnabledForJreRange / @DisabledForJreRangeJRE is inside or outside a specified version range
@EnabledIfSystemProperty / @DisabledIfSystemPropertyA system property matches (or doesn't match) a regex
@EnabledIfEnvironmentVariableAn environment variable matches a regex
@EnabledIf / @DisabledIfA static boolean method returns false / true
import org.junit.jupiter.api.condition.*;

class ConditionalTests {

    @Test
    @EnabledOnOs(OS.LINUX)
    void linuxOnlyTest() { ... }

    @Test
    @DisabledOnOs({OS.WINDOWS, OS.MAC})
    void notOnWindowsOrMac() { ... }

    @Test
    @EnabledOnJre(JRE.JAVA_21)
    void java21Feature() { ... }

    @Test
    @EnabledForJreRange(min = JRE.JAVA_17, max = JRE.JAVA_21)
    void java17to21Only() { ... }

    @Test
    @EnabledIfEnvironmentVariable(named = "ENV", matches = "CI")
    void ciOnlyTest() { ... }

    @Test
    @EnabledIfSystemProperty(named = "db.available", matches = "true")
    void databaseTest() { ... }

    // @EnabledIf: call a custom static method
    @Test
    @EnabledIf("isWeekend")
    void weekendTest() { ... }

    static boolean isWeekend() {
        DayOfWeek day = LocalDate.now().getDayOfWeek();
        return day == DayOfWeek.SATURDAY || day == DayOfWeek.SUNDAY;
    }
}

What is the advantage of using @EnabledOnOs over writing assumeTrue(OS is Linux) inside the test body?
What interface does JUnit 6 use internally to implement the condition annotations?

More Related questions...

What is JUnit 6 and when was it released? What is the JUnit 6 architecture and what are its three main components? What are the core annotations in JUnit 6 and what does each do? What assertions does JUnit 6 provide and how do you use them? What are parameterized tests in JUnit 6 and how do you write them? What is the CancellationToken API introduced in JUnit 6? What are JSpecify nullability annotations in JUnit 6 and why do they matter? What is the native Kotlin coroutine support in JUnit 6? What are the Extension Model and extension points in JUnit 6? What are nested tests in JUnit 6 and what is the @TestClassOrder/@TestMethodOrder inheritance change? What is @ParameterizedClass in JUnit 6 and how does it differ from @ParameterizedTest? What is the FastCSV migration in JUnit 6 and how does it affect @CsvSource and @CsvFileSource? What modules were removed in JUnit 6 and what replaced them? How do you migrate from JUnit 5 to JUnit 6? What are assumptions in JUnit 6 and how do they differ from assertions? What is @TestInstance and how does it change test class lifecycle? What is the @RegisterExtension annotation and how does it differ from @ExtendWith? What is the @TempDir annotation in JUnit 6? What are dynamic tests in JUnit 6 and how do you create them with @TestFactory? How does parallel test execution work in JUnit 6? What is @ParameterizedClass in JUnit 6 and how does it differ from @ParameterizedTest? What FastCSV migration happened in JUnit 6 and what are the breaking changes? What is the TestInstance lifecycle in JUnit 6 and what are the two modes? How does test ordering work in JUnit 6 with @TestMethodOrder? What modules were removed in JUnit 6 and why? How do you migrate from JUnit 5 to JUnit 6? What are assumptions in JUnit 6 and how do they differ from assertions? What is the @TempDir annotation and how has it changed in JUnit 6? How does parallel test execution work in JUnit 6? What is the difference between @ExtendWith and @RegisterExtension in JUnit 6? What is the @RepeatedTest annotation in JUnit 6? What is the ExtensionContext and its Store used for in JUnit 6? What are tags and filtering in JUnit 6 and how are they used? What are dynamic tests in JUnit 6 and how does @TestFactory work? How does JUnit 6 integrate with Maven and Gradle? What is the @Suite API in JUnit 6 and how do you group tests into suites? What is the ParameterResolver extension interface and how do you use it for custom injection? What is conditional test execution in JUnit 6 and what built-in conditions are available? What are test interfaces and default methods in JUnit 6? How does JUnit 6 interact with Mockito and Spring Test? What is the TestExecutionListener SPI in JUnit 6? What are the key differences between JUnit 4 and JUnit 6? What is TestWatcher extension interface in JUnit 6 and when do you use it? What is the ConsoleLauncher and how do you run JUnit 6 tests from the command line? What is the @AutoClose extension and how does it simplify resource management in JUnit 6? How does JUnit 6 support for Kotlin differ from JUnit 5? What is the @DisplayNameGeneration annotation in JUnit 6? What is TestReporter in JUnit 6 and how do you use it? What are the unified version changes in JUnit 6 and why do they matter for dependency management? What are best practices and anti-patterns in JUnit 6 test design?
Show more question and Answers...

PractiTest Interview Questions

Comments & Discussions

Interviews Questions

About Javapedia.net

Javapedia.net is for Java and J2EE developers, technologist and college students who prepare of interview. Also this site includes many practical examples.

This site is developed using J2EE technologies by Steve Antony, a senior Developer/lead at one of the logistics based company.

Follow Javapedia updates

contact: javatutorials2016[at]gmail[dot]com

Kindly consider donating for maintaining this website. Thanks.

Copyright © 2026, javapedia.net, all rights reserved. · .

DMCA.com Protection Status