Unit testing concept in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the JUnit test annotation.

JUnit

import org.junit.[1];

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

ATest

BBefore

CAfter

DIgnore

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Before or @After instead of @Test for test methods.

Forgetting to import the annotation.

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

2fill in blank

medium

Complete the code to assert that two values are equal in a test.

JUnit

assertEquals([1], actualValue);

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

AactualValue

Btrue

Cfalse

DexpectedValue

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping expected and actual values.

Using boolean values instead of expected results.

The assertEquals method compares the expected value to the actual value.

3fill in blank

hard

Fix the error in the test method declaration by completing the annotation.

JUnit

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

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

ATest

BBefore

CAfter

DIgnore

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Before or @After instead of @Test for test methods.

Forgetting the annotation causes the test not to run.

The @Test annotation is required to tell JUnit this method is a test.

4fill in blank

hard

Fill both blanks to create a test method that checks if a list is empty.

JUnit

@[1]
public void testListEmpty() {
    List<String> list = new ArrayList<>();
    assertTrue(list.[2]());
}

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

ATest

BBefore

CisEmpty

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Before instead of @Test annotation.

Using size() without comparing to zero.

The method is marked with @Test and uses isEmpty() to check if the list has no elements.

5fill in blank

hard

Fill all three blanks to write a test that checks if a string contains a substring.

JUnit

@[1]
public void testContains() {
    String text = "hello world";
    assertTrue(text.[2]("[3]"));
}

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

ATest

Bcontains

Cworld

DstartsWith

Attempts:

3 left

💡 Hint

Common Mistakes

Using startsWith instead of contains.

Forgetting to annotate the method with @Test.

The test method is annotated with @Test. It uses the contains method to check if the string includes the substring "world".