Testing / JUnit6 Interview Questions
What is @ParameterizedClass in JUnit 6 and how does it differ from @ParameterizedTest?
@ParameterizedClass is a JUnit 6 (and late JUnit 5) annotation that parameterises an entire test class rather than a single test method. Instead of repeating @ParameterizedTest on every method, the whole class is instantiated multiple times with different argument sets.
// @ParameterizedTest: repeats one method class OrderTest { @ParameterizedTest @CsvSource({"PENDING,false", "SHIPPED,true", "CANCELLED,true"}) void isFinalStatus(Status status, boolean expected) { assertEquals(expected, status.isFinal()); } // Problem: if 10 methods need the same data source, you repeat // the annotation 10 times } // @ParameterizedClass: repeats the WHOLE class (JUnit 6) @ParameterizedClass @CsvSource({"PENDING,false", "SHIPPED,true", "CANCELLED,true"}) class StatusTest { @Parameter(0) Status status; // field injection @Parameter(1) boolean expectedFinal; @Test void isFinalStatus() { assertEquals(expectedFinal, status.isFinal()); } @Test void descriptionIsNotEmpty() { assertFalse(status.description().isBlank()); } @Test void statusToStringContainsName() { assertTrue(status.toString().contains(status.name())); } // All 3 tests run for each of the 3 CSV rows: // 9 total test executions instead of 3x@ParameterizedTest } // Display name format in JUnit 6: "status = PENDING, expectedFinal = false" // JUnit 5 style was: "status=PENDING, expectedFinal=false" (no spaces)
Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!
Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.
Invest now!!! Get Free equity stock (US, UK only)!
Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.
The Robinhood app makes it easy to trade stocks, crypto and more.
Webull! Receive free stock by signing up using the link: Webull signup.
More Related questions...
