How to put your code under test with Maven, Spring and Junit

So i worked a lot with maven, spring and junit, and on every project i faced the need to have my code under test and so i do each time. an i thought why not have a simple how to do so and so i do this post :D.

so let see what you need to have your own maven project running

1. JDK 1.6+.
2. Maven.
3. IDE or any text editor.

so my pom.xml looks like

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>org.shereifhawary.spring</groupId>

<artifactId>testing</artifactId>

<version>0.0.1-SNAPSHOT</version>

<properties>

<spring.version>3.0.5.RELEASE</spring.version>

</properties>

<dependencies>

<!-- Spring 3 dependencies -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-core</artifactId>

<version>${spring.version}</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

<!-- testing dependencies -->

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.11</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-test</artifactId>

<version>${spring.version}</version>

<scope>test</scope>

</dependency>

</dependencies>

</project>

and i have a simple model and simple service that use this model

as

package com.shereifhawary.spring;
public class SimpleModel {
private String value = "some value";
public String getValue(){
return this.value;
}
public void setValue(String value) {
this.value = value;
}
}

package com.shereifhawary.spring;

public class SimpleService {

private SimpleModel model;

public SimpleModel getModel() {

return model;

}

public void setModel(SimpleModel model) {

this.model = model;

}

public String getValue(){

return model.getValue();

}

}

inside the src/test/resources/beans.xml which carry the bean definition

<beans xmlns="http://www.springframework.org/schema/beans"

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-3.0.xsd">

         <bean id="simpleModel" class="com.shereifhawary.spring.SimpleModel">

             <property name="value" value="some value from Spring config"/>

         </bean>

 

<bean id="simpleService" class="com.shereifhawary.spring.SimpleService">

   <property name="model" ref="simpleModel"/>

</bean>

</beans>

and the test case should be like

package com.shereifhawary.spring.tests;

import static org.junit.Assert.*;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.shereifhawary.spring.SimpleService;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = { "/beans.xml" })

public class TestSpringContext {

         

         // the autowire will set the simpleSerice object with the one in the bean.xml

         // so you can use it inside the testcase without even using setup function

@Autowired

SimpleService simpleService;

@Test

public void testSimpleService(){

                // as you can see we set the value with "some value" in the class itself,

                // but inside the bean.xml we set it with "some value from Spring config

"

assertNotEquals("some value",simpleService.getValue());

assertEquals("some value from Spring config

",simpleService.getValue());

}

}

i hope you like it, if you have any questions please leave it below ;)