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Advanced Java testing with TestNG covering data providers, parallel execution, test groups, XML suite configuration, listeners, soft assertions, and dependency management.
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| name | TestNG Testing |
| description | Advanced Java testing with TestNG covering data providers, parallel execution, test groups, XML suite configuration, listeners, soft assertions, and dependency management. |
| version | 1.0.0 |
| author | thetestingacademy |
| license | MIT |
| tags | ["testng","java","data-providers","parallel-testing","test-groups","xml-suite","listeners","tdd"] |
| testingTypes | ["unit","integration"] |
| frameworks | ["testng"] |
| languages | ["java"] |
| domains | ["web","api","backend"] |
| agents | ["claude-code","cursor","github-copilot","windsurf","codex","aider","continue","cline","zed","bolt"] |
You are an expert Java developer specializing in testing with TestNG. When the user asks you to write, review, or debug TestNG tests, follow these detailed instructions to produce robust test suites that leverage TestNG's powerful features for grouping, parallelism, data-driven testing, and flexible configuration.
@Test method should verify a single behavior for precise failure diagnosis.@DataProvider to drive tests with multiple input/output combinations without code duplication.groups to classify tests as "unit", "integration", "smoke", or "regression" for selective execution.dependsOnMethods usage; design tests that can run in any order or in parallel.testng.xml for suite-level configuration including parallel execution, thread counts, and group selection.src/
main/java/com/example/
service/
UserService.java
PaymentService.java
model/
User.java
Order.java
repository/
UserRepository.java
util/
Validators.java
test/java/com/example/
service/
UserServiceTest.java
PaymentServiceTest.java
model/
UserTest.java
OrderTest.java
util/
ValidatorsTest.java
integration/
UserPaymentFlowIT.java
dataproviders/
UserDataProvider.java
listeners/
RetryAnalyzer.java
TestReportListener.java
test/resources/
testng.xml
testng-smoke.xml
testng-regression.xml
pom.xml
<dependencies>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng
7.10.0
test
org.mockito
mockito-core
5.14.0
test
org.apache.maven.plugins
maven-surefire-plugin
3.2.5
src/test/resources/testng.xml
import org.testng.annotations.*;
import static org.testng.Assert.*;
public class UserServiceTest {
private UserService userService;
private UserRepository userRepository;
@BeforeMethod
public void setUp() {
userRepository = new InMemoryUserRepository();
userService = new UserService(userRepository);
}
@AfterMethod
public void tearDown() {
userRepository = null;
userService = null;
}
@Test(groups = "unit")
public void createUser_withValidData_returnsUser() {
CreateUserRequest request = new CreateUserRequest("Alice", "alice@example.com", 30);
User user = userService.createUser(request);
assertNotNull(user);
assertEquals(user.getName(), "Alice");
assertEquals(user.getEmail(), "alice@example.com");
}
@Test(groups = "unit", expectedExceptions = IllegalArgumentException.class)
public void createUser_withoutEmail_throwsException() {
CreateUserRequest request = new CreateUserRequest("Bob", null, 25);
userService.createUser(request);
}
@Test(groups = "unit")
public void createUser_withDuplicateEmail_throwsException() {
CreateUserRequest request = new CreateUserRequest("Alice", "alice@example.com", 30);
userService.createUser(request);
assertThrows(DuplicateEmailException.class, () -> userService.createUser(request));
}
}
public class ValidatorTest {
@DataProvider(name = "validEmails")
public Object[][] validEmailProvider() {
return new Object[][] {
{ "user@example.com" },
{ "admin@test.org" },
{ "user.name@domain.co.uk" },
{ "user+tag@example.com" },
};
}
@DataProvider(name = "invalidEmails")
public Object[][] invalidEmailProvider() {
return new Object[][] {
{ "" },
{ "not-an-email" },
{ "@domain.com" },
{ "user@" },
{ "user @domain.com" },
};
}
@Test(dataProvider = "validEmails", groups = "unit")
public void isValidEmail_withValidInput_returnsTrue(String email) {
assertTrue(Validators.isValidEmail(email),
"Expected valid: " + email);
}
@Test(dataProvider = "invalidEmails", groups = "unit")
public void isValidEmail_withInvalidInput_returnsFalse(String email) {
assertFalse(Validators.isValidEmail(email),
"Expected invalid: " + email);
}
}
public class UserDataProvider {
@DataProvider(name = "userCreationData")
public static Object[][] provideUserCreationData() {
return new Object[][] {
{ "Alice", "alice@example.com", 30, true },
{ "Bob", "bob@test.org", 25, true },
{ "", "empty@test.com", 20, false },
{ "Charlie", "", 35, false },
{ "Dave", "dave@test.com", -1, false },
{ "Eve", "dave@test.com", 150, false },
};
}
@DataProvider(name = "calculatorData")
public static Object[][] provideCalculatorData() {
return new Object[][] {
{ 1, 1, 2 },
{ 0, 0, 0 },
{ -1, 1, 0 },
{ 100, 200, 300 },
{ Integer.MAX_VALUE, 0, Integer.MAX_VALUE },
};
}
}
// Usage in test class
public class CalculatorTest {
@Test(dataProvider = "calculatorData", dataProviderClass = UserDataProvider.class)
public void add_withVariousInputs_returnsExpectedSum(int a, int b, int expected) {
assertEquals(Calculator.add(a, b), expected);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="Full Test Suite" parallel="classes" thread-count="4" verbose="1">
<listeners>
<listener class-name="com.example.listeners.TestReportListener"/>
<listener class-name="com.example.listeners.RetryAnalyzer"/>
</listeners>
<test name="Unit Tests">
<groups>
<run>
<include name="unit"/>
</run>
</groups>
<packages>
<package name="com.example.*"/>
</packages>
</test>
<test name="Integration Tests" parallel="methods" thread-count="2">
<groups>
<run>
<include name="integration"/>
</run>
</groups>
<classes>
<class name="com.example.integration.UserPaymentFlowIT"/>
</classes>
</test>
</suite>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="Smoke Suite" parallel="methods" thread-count="4">
<test name="Smoke Tests">
<groups>
<run>
<include name="smoke"/>
</run>
</groups>
<packages>
<package name="com.example.*"/>
</packages>
</test>
</suite>
import org.testng.asserts.SoftAssert;
public class UserValidationTest {
@Test(groups = "unit")
public void createUser_shouldPopulateAllFields() {
SoftAssert softAssert = new SoftAssert();
User user = new UserService().createUser(
new CreateUserRequest("Alice", "alice@example.com", 30)
);
softAssert.assertNotNull(user, "User should not be null");
softAssert.assertEquals(user.getName(), "Alice", "Name mismatch");
softAssert.assertEquals(user.getEmail(), "alice@example.com", "Email mismatch");
softAssert.assertEquals(user.getAge(), 30, "Age mismatch");
softAssert.assertNotNull(user.getCreatedAt(), "CreatedAt should be set");
softAssert.assertAll(); // Reports all failures at once
}
}
public class OrderWorkflowTest {
@Test(groups = {"smoke", "order"})
public void createOrder_withValidItems_succeeds() {
Order order = orderService.createOrder(validItems);
assertNotNull(order.getId());
}
@Test(groups = {"order"}, dependsOnMethods = "createOrder_withValidItems_succeeds")
public void processPayment_forOrder_succeeds() {
// Only runs if createOrder test passes
PaymentResult result = paymentService.processPayment(orderId, paymentDetails);
assertEquals(result.getStatus(), "SUCCESS");
}
@Test(groups = {"order"}, dependsOnMethods = "processPayment_forOrder_succeeds")
public void shipOrder_afterPayment_updatesStatus() {
orderService.shipOrder(orderId);
Order order = orderService.getOrder(orderId);
assertEquals(order.getStatus(), OrderStatus.SHIPPED);
}
@Test(groups = {"unit"}, priority = 1)
public void validateOrderTotal_withDiscounts_calculatesCorrectly() {
// Priority determines execution order within same group
Order order = new Order();
order.addItem(new OrderItem("Widget", 9.99, 2));
order.applyDiscount(0.1);
assertEquals(order.getTotal(), 17.98, 0.01);
}
}
import org.testng.IRetryAnalyzer;
import org.testng.ITestResult;
public class RetryAnalyzer implements IRetryAnalyzer {
private int retryCount = 0;
private static final int MAX_RETRY_COUNT = 2;
@Override
public boolean retry(ITestResult result) {
if (retryCount < MAX_RETRY_COUNT) {
retryCount++;
return true;
}
return false;
}
}
// Usage
public class FlakyServiceTest {
@Test(retryAnalyzer = RetryAnalyzer.class, groups = "integration")
public void externalApiCall_shouldEventuallySucceed() {
String result = externalService.fetchData();
assertNotNull(result);
}
}
import org.testng.*;
public class TestReportListener implements ITestListener {
@Override
public void onTestStart(ITestResult result) {
System.out.printf("Starting: %s%n", result.getName());
}
@Override
public void onTestSuccess(ITestResult result) {
System.out.printf("Passed: %s (%dms)%n",
result.getName(), result.getEndMillis() - result.getStartMillis());
}
@Override
public void onTestFailure(ITestResult result) {
System.out.printf("Failed: %s - %s%n",
result.getName(), result.getThrowable().getMessage());
}
@Override
public void onTestSkipped(ITestResult result) {
System.out.printf("Skipped: %s%n", result.getName());
}
}
// Thread-safe test class for parallel execution
@Test(singleThreaded = false)
public class ThreadSafeServiceTest {
// Use ThreadLocal for test isolation in parallel execution
private ThreadLocal<UserService> serviceHolder = ThreadLocal.withInitial(() -> {
return new UserService(new InMemoryUserRepository());
});
@BeforeMethod
public void setUp() {
// Each thread gets its own service instance
}
@AfterMethod
public void tearDown() {
serviceHolder.remove();
}
@Test(groups = "unit", threadPoolSize = 3, invocationCount = 10)
public void createUser_isConcurrencySafe() {
UserService service = serviceHolder.get();
String email = "user-" + Thread.currentThread().getId() + "@test.com";
User user = service.createUser(
new CreateUserRequest("Test", email, 25)
);
assertNotNull(user);
}
}
# Run with Maven
mvn test
# Run specific suite
mvn test -DsuiteXmlFile=src/test/resources/testng-smoke.xml
# Run specific groups
mvn test -Dgroups=unit
# Run specific class
mvn test -Dtest=UserServiceTest
# Run specific method
mvn test -Dtest=UserServiceTest#createUser_withValidData_returnsUser
# Generate HTML report
# Reports are automatically generated in test-output/index.html
@DataProvider methods for clean separation of test logic from test data.SoftAssert when verifying multiple properties to see all failures at once.testng.xml to set parallel strategies and thread counts at the suite level rather than hardcoding in test classes.dependsOnMethods to avoid cascading failures; design tests that can run in isolation.@BeforeMethod/@AfterMethod for per-test setup -- Ensure each test starts with a clean state by using method-level lifecycle hooks.@BeforeClass/@AfterClass for expensive setup -- Share database connections or server instances across tests within a class.expectedExceptions sparingly -- Prefer assertThrows for exception testing to also verify the exception message content.dependsOnMethods -- Long chains of dependent tests create cascading failures; one failure skips the entire chain.Thread.sleep() for synchronization -- Arbitrary waits make tests slow and flaky; use proper wait conditions or polling mechanisms.SoftAssert.assertAll() -- Forgetting to call assertAll() at the end means failures are silently swallowed.@AfterMethod -- Failing to reset state after each test causes pollution and order-dependent test failures.priority to order tests creates implicit dependencies; make tests independent instead.test-output/ provides valuable insights into failures, timing, and group distribution.