Maven execution of single attached test - maven

Question

I'm relatively new to maven and have been struggling with attached tests, I've found a few articles here that have got me part of the way there but can't quite get that last little bit. Here is what I'm trying to do. I have 2 modules one that defines a set of interfaces and rudimentary test of those interfaces. The second module provides an implementation of the interface and I'd like to run the predefined test on it. I boiled it down to a simple example, here are the two projects:
interface
+ pom.xml
+ src
+ main
+ java
+ demo
+ Messenger.java
+ test
+ java
+ demo
+ MessengerTest.java
impl
+ pom.xml
+ src
+ main
+ java
+ demo
+ impl
+ MessengerImpl.java
+ test
+ resources
+ context.xml
The interface pom.xml:
<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">
<groupId>demo</groupId>
<artifactId>interface</artifactId>
<version>1.0</version>
<modelVersion>4.0.0</modelVersion>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.2.2.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.14</version>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<goals>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
The Messenger.java source:
package demo;
public interface Messenger {
String getMessage();
}
The MessengerTest.java source:
package demo;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import demo.Messenger;
public class MessengerTest {
private BeanFactory beanfactory;
#Before
public void setUp() throws Exception {
beanfactory = new ClassPathXmlApplicationContext("context.xml");
}
#Test
public final void testGetMessage() throws Exception {
final Messenger msngr = beanfactory.getBean(Messenger.class);
String msg = msngr.getMessage();
assertNotNull(msg);
assertTrue(msg.length() > 0);
}
}
Executing 'mvn install' appears to do the right thing creating interface-1.0.jar and interface-1.0-tests.jar in my local repository.
The implementation code is simple, the pom.xml:
<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">
<groupId>demo</groupId>
<artifactId>impl</artifactId>
<version>1.0</version>
<modelVersion>4.0.0</modelVersion>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>demo</groupId>
<artifactId>interface</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>demo</groupId>
<artifactId>interface</artifactId>
<version>1.0</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
</dependencies>
</project>
The MessageImpl.java source:
package demo.impl;
import demo.Messenger;
public class MessengerImpl implements Messenger {
#Override
public String getMessage() {
return "Hello World";
}
}
And finally, the spring context file:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="MyMessenger" class="demo.impl.MessengerImpl"/>
</beans>
With all of this in place I execute 'mvn -Dtest=demo.MessengerTest test', and unfortunately it fails with "... No tests were executed!". So there is the problem.
Sorry, for being so long winded but I wanted to be fairly complete, any guidance would be greatly appreciated.

Answer 1

Surefire doesn't scan through the classpath when deciding what classes to run, so only tests defined in the same module are normally considered. It checks in target/classes in the impl project, doesn't see any tests, and ignores MessengerTest. You could define a test suite in the impl project that references the tests to run, or unzip the dependency into target/classes.