@ParameterizedTest annotation in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the annotation for parameterized tests.

JUnit

import org.junit.jupiter.api.[1];

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ATest

BParameterizedTest

CBeforeEach

DAfterAll

Attempts:

3 left

💡 Hint

Common Mistakes

Importing @Test instead of @ParameterizedTest

Using annotations from JUnit 4

Forgetting to import the annotation

The @ParameterizedTest annotation is imported from org.junit.jupiter.api.ParameterizedTest.

2fill in blank

medium

Complete the code to supply string values for the parameterized test.

JUnit

@ParameterizedTest
@ValueSource(strings = {"apple", "banana", "cherry"})
void testFruits([1] fruit) {
    System.out.println(fruit);
}

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AString

Bint

Cdouble

Dboolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using int or other types instead of String

Forgetting to match parameter type with @ValueSource type

The parameter type must match the type of values supplied by @ValueSource, which is String here.

3fill in blank

hard

Fix the error in the parameterized test method signature.

JUnit

@ParameterizedTest
@ValueSource(ints = {1, 2, 3})
void testNumbers([1] number) {
    assertTrue(number > 0);
}

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AInteger

BString

Cint

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using String instead of int

Using wrapper Integer instead of primitive int

The parameter type must be int to match the ints array in @ValueSource.

4fill in blank

hard

Fill both blanks to create a parameterized test that checks if numbers are even.

JUnit

@ParameterizedTest
@ValueSource([1] = {2, 4, 6, 8})
void testEvenNumbers([2] number) {
    assertEquals(0, number % 2);
}

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Aints

BString

Cint

Dstrings

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'strings' or 'String' for integer values

Mismatch between annotation and parameter types

The @ValueSource uses ints, so the parameter type must be int.

5fill in blank

hard

Fill all three blanks to create a parameterized test using @CsvSource with two parameters.

JUnit

@ParameterizedTest
@CsvSource({"apple, 1", "banana, 2", "cherry, 3"})
void testFruitCount([1] fruit, [2] count) {
    assertNotNull(fruit);
    assertTrue(count > [3]);
}

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AString

Bint

C0

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter types

Incorrect comparison value in assertion

The first parameter is a String, the second is an int, and the assertion checks count > 0.