Parameterized Unit Tests with JUnit 5

Overview

Provides patterns for parameterized unit tests in Java using JUnit 5. Covers @ValueSource, @CsvSource, @MethodSource, @EnumSource, @ArgumentsSource, and custom display names. Reduces test duplication by running the same test logic with multiple input values.

When to Use

• Writing JUnit tests with multiple input combinations
• Implementing data-driven tests in Java
• Running same test with different values (boundary analysis)
• Testing multiple scenarios from single test method

Instructions

1. Add dependency: Ensure junit-jupiter-params is on test classpath (included in junit-jupiter)
2. Choose source: @ValueSource for simple values, @CsvSource for tabular data, @MethodSource for complex objects
3. Match parameters: Test method parameters must match data source types
4. Set display names: Use name = "{0}..." for readable output
5. Validate: Run ./gradlew test --info or mvn test and verify all parameter combinations execute

Examples

Maven / Gradle Dependency

JUnit 5 parameterized tests require junit-jupiter (includes params). Add assertj-core for assertions:

<!-- Maven -->
<dependency>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter</artifactId>
  <scope>test</scope>
</dependency>

// Gradle
testImplementation("org.junit.jupiter:junit-jupiter")

@ValueSource — Simple Values

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
import static org.assertj.core.api.Assertions.*;

@ParameterizedTest
@ValueSource(strings = {"hello", "world", "test"})
void shouldCapitalizeAllStrings(String input) {
  assertThat(StringUtils.capitalize(input)).isNotEmpty();
}

@ParameterizedTest
@ValueSource(ints = {1, 2, 3, 4, 5})
void shouldBePositive(int number) {
  assertThat(number).isPositive();
}

@ParameterizedTest
@ValueSource(ints = {Integer.MIN_VALUE, -1, 0, 1, Integer.MAX_VALUE})
void shouldHandleBoundaryValues(int value) {
  assertThat(Math.incrementExact(value)).isGreaterThan(value);
}

@CsvSource — Tabular Data

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

@ParameterizedTest
@CsvSource({
  "[email protected], true",
  "[email protected],     true",
  "invalid-email,     false",
  "user@,             false",
  "@example.com,       false"
})
void shouldValidateEmailAddresses(String email, boolean expected) {
  assertThat(UserValidator.isValidEmail(email)).isEqualTo(expected);
}

@MethodSource — Complex Data

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import java.util.stream.Stream;

@ParameterizedTest
@MethodSource("additionTestCases")
void shouldAddNumbersCorrectly(int a, int b, int expected) {
  assertThat(Calculator.add(a, b)).isEqualTo(expected);
}

static Stream<Arguments> additionTestCases() {
  return Stream.of(
    Arguments.of(1, 2, 3),
    Arguments.of(0, 0, 0),
    Arguments.of(-1, 1, 0),
    Arguments.of(100, 200, 300)
  );
}

@EnumSource — Enum Values

@ParameterizedTest
@EnumSource(Status.class)
void shouldHandleAllStatuses(Status status) {
  assertThat(status).isNotNull();
}

@ParameterizedTest
@EnumSource(value = Status.class, names = {"ACTIVE", "INACTIVE"})
void shouldHandleSpecificStatuses(Status status) {
  assertThat(status).isIn(Status.ACTIVE, Status.INACTIVE);
}

Custom Display Names

@ParameterizedTest(name = "Discount of {0}% should be calculated correctly")
@ValueSource(ints = {5, 10, 15, 20})
void shouldApplyDiscount(int discountPercent) {
  double result = DiscountCalculator.apply(100.0, discountPercent);
  assertThat(result