TestNG vs JUnit 5: Honest 2026 Comparison

Last updated: June 29, 2026 · Reading time: 8 minutes · By SoftwareTestPilot Editorial Team

Bottom line: Both are excellent in 2026. JUnit 5 wins for new projects, Spring Boot, and modern API ergonomics. TestNG wins for built-in test dependencies, granular parallel control, and built-in HTML reports.

This guide gives you the honest comparison with code examples. For the broader Java context, see our Java for Selenium Automation tutorial.

import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;

class LoginTest {
    private WebDriver driver;

    @BeforeEach
    void setUp() {
        driver = new ChromeDriver();
    }

    @AfterEach
    void tearDown() {
        if (driver != null) driver.quit();
    }

    @Test
    @DisplayName("Successful login")
    void testLogin() {
        driver.get("https://example.com/login");
        driver.findElement(By.id("email")).sendKeys("admin@example.com");
        driver.findElement(By.id("password")).sendKeys("Sup3rSecret!");
        driver.findElement(By.id("submit")).click();

        assertTrue(driver.getCurrentUrl().contains("/dashboard"));
    }

    @Test
    @Disabled("Flaky — needs investigation")
    void testLoginWithInvalidPassword() {
        // ...
    }
}

import org.testng.annotations.*;
import static org.testng.Assert.*;

public class LoginTest {
    private WebDriver driver;

    @BeforeMethod
    public void setUp() {
        driver = new ChromeDriver();
    }

    @AfterMethod
    public void tearDown() {
        if (driver != null) driver.quit();
    }

    @Test(priority = 1, groups = "smoke")
    public void testLogin() {
        driver.get("https://example.com/login");
        driver.findElement(By.id("email")).sendKeys("admin@example.com");
        driver.findElement(By.id("password")).sendKeys("Sup3rSecret!");
        driver.findElement(By.id("submit")).click();

        assertTrue(driver.getCurrentUrl().contains("/dashboard"));
    }

    @Test(priority = 2, dependsOnMethods = "testLogin")
    public void testLogout() {
        // ...
    }
}

JUnit 5

@ParameterizedTest
@ValueSource(strings = {"admin@example.com", "viewer@example.com"})
void loginWithMultipleEmails(String email) {
    // ...
}

@ParameterizedTest
@CsvSource({
    "admin@example.com, Sup3rSecret!, Welcome admin",
    "viewer@example.com, ViewerPass1!, Welcome viewer"
})
void loginWithMultipleUsers(String email, String password, String greeting) {
    // ...
}

TestNG

@DataProvider(name = "users")
public Object[][] userData() {
    return new Object[][] {
        {"admin@example.com", "Sup3rSecret!", "Welcome admin"},
        {"viewer@example.com", "ViewerPass1!", "Welcome viewer"}
    };
}

@Test(dataProvider = "users")
public void loginTest(String email, String password, String greeting) {
    // ...
}

Both frameworks support data-driven testing well. TestNG's @DataProvider is slightly more flexible.

JUnit 5

In junit-platform.properties:

junit.jupiter.execution.parallel.enabled=true
junit.jupiter.execution.parallel.mode.default=concurrent

Or programmatically:

@Execution(ExecutionMode.CONCURRENT)
class ParallelTests {
    // ...
}

TestNG

In testng.xml:

<suite name="Suite" parallel="methods" thread-count="4">
    <test name="Tests">
        <classes>
            <class name="LoginTest"/>
        </classes>
    </test>
</suite>

TestNG has more granular parallel control (methods, classes, tests, instances). For CI parallelism, see our GitHub Actions for Automation Testing guide.

JUnit 5

Use the Surefire plugin in Maven:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>3.5.0</version>
</plugin>

Or Allure for richer reports.

TestNG

TestNG has built-in HTML reports out of the box. You can also use Allure with TestNG for richer dashboards.

• Test dependencies — dependsOnMethods is built-in
• Test grouping — multiple ways to organize tests
• Parallel control — more granular options
• Built-in reporters — without external plugins
• Parameter flexibility — @DataProvider is more flexible than @ParameterizedTest

• Modern API — cleaner, more Java-idiomatic
• Extensions model — more powerful than listeners
• Nested test classes — @Nested for better organization
• Dynamic tests — @TestFactory for runtime-generated tests
• Display names — @DisplayName for human-readable test names
• Conditional execution — @EnabledOnOs, @EnabledIfEnvironmentVariable

Choose JUnit 5 if

• You're starting a new project
• You want a modern API and features
• You're using Spring Boot (Spring Boot Test defaults to JUnit 5)
• You prefer a more Java-idiomatic style

Choose TestNG if

• You have an existing TestNG codebase
• You need built-in test dependencies
• You want built-in HTML reports without plugins
• You prefer more granular parallel control

In 2026, both frameworks are mature and capable. The choice often comes down to team preference and existing codebase.

TestNG → JUnit 5

• Convert @BeforeMethod → @BeforeEach
• Convert @DataProvider → @ParameterizedTest + @MethodSource
• Convert dependsOnMethods → explicit ordering or @TestMethodOrder
• Convert listeners → extensions

JUnit 5 → TestNG

• Convert @BeforeEach → @BeforeMethod
• Convert @ParameterizedTest → @DataProvider
• Convert extensions → listeners
• Convert @Nested → separate test classes

Mistake 1 — Mixing TestNG and JUnit in the same project

Pick one. Migration is hard; coexistence is messy.

Mistake 2 — Not using parallel execution

@Execution(ExecutionMode.CONCURRENT)  // JUnit 5

Mistake 3 — Hardcoded test data

// BAD
@Test
void testUser() {
    User user = new User("admin@example.com", "Sup3rSecret!");
}

// GOOD
@ParameterizedTest
@ValueSource(strings = {"admin", "viewer", "guest"})
void testMultipleUsers(String role) { /* ... */ }

Mistake 4 — Assertions without messages

// BAD
assertEquals(actual, expected);

// GOOD
assertEquals(actual, expected, "User email should match");

Mistake 5 — Ignoring test isolation

Tests must be independent. Never rely on execution order.

Mistake 6 — Misusing before/after hooks

Use @BeforeEach for per-test setup, @BeforeAll for shared setup. Don't put setup in test methods.

Mistake 7 — Not measuring coverage

<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
</plugin>

Aim for 80%+ on critical paths.

• Java for Selenium Automation
• Selenium WebDriver Guide
• CI/CD Pipeline Testing Tutorial
• GitHub Actions for Automation Testing
• REST Assured (Java) Tutorial

Official references: JUnit 5 User Guide · TestNG documentation.

Original SoftwareTestPilot research you can cite in reviews, RFCs, and interviews:

• TDD impact benchmarks (2026) — defect density, MTTD, PR test ratio.
• Test pyramid benchmarks (2026) — real 62 / 26 / 12 ratios and flake per layer.
• Shift-left benchmarks (2026) — DORA-style metrics and defect-fix cost.
• Enterprise automation tool benchmarks (2026) — flake vs licence cost.
• Selenium market benchmarks (2026) and Playwright market benchmarks (2026).