TestNG + Spring Integration Example

In this tutorial, we will show you how to test Spring’s components with TestNG.

Tools used :

1. TestNG 6.8.7
2. Spring 3.2.2.RELEASE
3. Maven 3
4. Eclipse IDE

1. Project Dependencies

To integrate Spring with TestNG, you need spring-test.jar, add the following :

	<properties>
		<spring.version>3.2.2.RELEASE</spring.version>	
		<testng.version>6.8.7</testng.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.testng</groupId>
			<artifactId>testng</artifactId>
			<version>${testng.version}</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

2. Spring Component

Create a simple Spring component, later we will test this component with TestNG.

package com.mkyong.testng.project.service.email;
public interface EmailGenerator {
	String generate();

package com.mkyong.testng.project.service.email;
import org.springframework.stereotype.Service;
@Service
public class RandomEmailGenerator implements EmailGenerator {
	@Override
	public String generate() {
		return "feedback@yoursite.com";

3. TestNG + Spring

Create a Spring configuration file in test folder, for Spring components scanning.

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-3.2.xsd
	">
	<context:component-scan base-package="com.mkyong.testng" />
</beans>

To access the Spring components in TestNG, extends AbstractTestNGSpringContextTests, see the following example :

package com.mkyong.testng.examples.spring;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.testng.AbstractTestNGSpringContextTests;
import org.testng.Assert;
import org.testng.annotations.Test;
import com.mkyong.testng.project.service.email.EmailGenerator;
@Test
@ContextConfiguration(locations = { "classpath:spring-test-config.xml" })
public class TestSpring extends AbstractTestNGSpringContextTests {
	@Autowired
	EmailGenerator emailGenerator;
	@Test()
	void testEmailGenerator() {
		String email = emailGenerator.generate();
		System.out.println(email);
		Assert.assertNotNull(email);
		Assert.assertEquals(email, "feedback@yoursite.com");

Output

feedback@yoursite.com
PASSED: testEmailGenerator
===============================================
    Default test
    Tests run: 1, Failures: 0, Skips: 0
===============================================

References

1. Spring – TestNG support classes
2. Spring AbstractTestNGSpringContextTests JavaDoc