@Test annotation in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mark the method as a test using JUnit.

JUnit

public class CalculatorTest {
    [1]
    public void testAddition() {
        // test code here
    }
}

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

A@Before

B@Test

C@After

D@Ignore

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Before or @After instead of @Test.

Forgetting the '@' symbol.

The @Test annotation marks a method as a test method in JUnit.

2fill in blank

medium

Complete the code to import the correct JUnit annotation for tests.

JUnit

import org.junit.[1];

public class SampleTest {
    @Test
    public void example() {}
}

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

ATest

BBefore

CIgnore

DAfter

Attempts:

3 left

💡 Hint

Common Mistakes

Importing @Before or @After instead of @Test.

Missing the import statement.

The @Test annotation is imported from org.junit.Test in JUnit 4.

3fill in blank

hard

Fix the error in the test method annotation.

JUnit

public class TestExample {
    [1]
    public void shouldPass() {
        // test logic
    }
}

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

A@TestMethod

BTest

C@Test

D@test

Attempts:

3 left

💡 Hint

Common Mistakes

Writing 'Test' without '@'.

Using lowercase '@test'.

Using '@TestMethod' which is not a JUnit annotation.

The correct annotation is '@Test' with uppercase 'T' and the '@' symbol.

4fill in blank

hard

Fill both blanks to complete a test method with an assertion.

JUnit

import static org.junit.Assert.[1];

public class MathTest {
    @Test
    public void testSum() {
        int result = 2 + 3;
        [2](5, result);
    }
}

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

AassertEquals

BassertTrue

CassertFalse

DassertNull

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertTrue or assertFalse which do not compare two values directly.

Using assertNull which checks for null values.

assertEquals(expected, actual) checks if the two values are equal in JUnit tests.

5fill in blank

hard

Fill all three blanks to write a test method that expects an exception.

JUnit

import org.junit.Test;

public class ExceptionTest {
    @Test(expected = [1].class)
    public void testException() {
        throw new [2]();
    }

    class [3] extends RuntimeException {}
}

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

AIllegalArgumentException

BRuntimeException

CMyException

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using different exception names in the annotation and throw statement.

Using standard exceptions instead of the custom one.

Not matching the class name in the definition.

The test expects MyException.class, throws new MyException(), and defines MyException extending RuntimeException.