JUnit 4 vs JUnit 5 (Jupiter) differences - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use the correct annotation for a test method in JUnit 5.

JUnit

@[1]
public void testAddition() {
    assertEquals(5, 2 + 3);
}

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ATestMethod

BTest

CTestCase

DTestAnnotation

Attempts:

3 left

💡 Hint

Common Mistakes

Using @TestMethod which does not exist in JUnit 5.

Confusing with JUnit 4 imports.

In JUnit 5, the test method is annotated with @Test from the org.junit.jupiter.api package.

2fill in blank

medium

Complete the code to disable a test method in JUnit 5.

JUnit

@Test
@[1]
public void testFeature() {
    // test code
}

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ADisabled

BIgnore

CSkip

DIgnoreTest

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Ignore which is from JUnit 4.

Using @Skip which does not exist.

In JUnit 5, to disable a test method, use the @Disabled annotation.

3fill in blank

hard

Fix the error in the JUnit 5 lifecycle method annotation for setup before all tests.

JUnit

@Before[1]
public static void initAll() {
    // initialization code
}

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ASuite

BBeforeClass

CAllTests

DAll

Attempts:

3 left

💡 Hint

Common Mistakes

Using @BeforeClass which is from JUnit 4.

Using incorrect suffixes like 'Suite' or 'AllTests'.

In JUnit 5, the annotation for setup before all tests is @BeforeAll. It replaces JUnit 4's @BeforeClass.

4fill in blank

hard

Fill both blanks to correctly write a parameterized test in JUnit 5.

JUnit

@[1]
@[2](value = {"apple", "banana", "cherry"})
void testFruits(String fruit) {
    assertNotNull(fruit);
}

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AParameterizedTest

BValueSource

CTest

DCsvSource

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Test instead of @ParameterizedTest.

Using @CsvSource when only simple values are needed.

In JUnit 5, parameterized tests use @ParameterizedTest and @ValueSource to supply values.

5fill in blank

hard

Fill all three blanks to write a JUnit 5 test method that asserts an exception is thrown.

JUnit

@Test
void testException() {
    Exception exception = assertThrows([1].class, () -> {
        throw new [2]("Error");
    });
    assertEquals("[3]", exception.getMessage());
}

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AIllegalArgumentException

CError

DRuntimeException

Attempts:

3 left

💡 Hint

Common Mistakes

Using different exception classes in assertThrows and throw statement.

Mismatching the exception message string.

This test checks that an IllegalArgumentException is thrown with the message "Error".