Maven test fails if parent test class is in depenedncy - maven-3

Question

I have 2 maven modules and tests as following:
Module1
`src/test/java/Parent`
Module2
`src/test/java/Test // Test extends Parent`
Module1 has rumtime dependency on Module1
When I run mvn test, I get below error:
org.apache.maven.surefire.util.SurefireReflectionException: java.lang.reflect.InvocationTargetException; nested exception is java.lang.reflect.InvocationTargetException: null
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)
Caused by: java.lang.NoClassDefFoundError: Parent
Any idea what I may be doing correct?
Compilation in eclipse succeeds.

Answer 1

Usually in Maven unit tests are limited by module and will not be propagated which means you can't use them in other module. Unfortunately Eclipse does this separation not 100% correct as you already realized.
You can if you need create a so called test-jar which contains the files from src/test/ which gives you the possibility to reuse those classes from an other module. This mean you need to add the following to your Module1:
<project>
...
<build>
<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<goals>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
</plugin>
...
</plugins>
</build>
...
</project>
In you other module you need to add the dependency to this separately created artifact by using this:
<project>
...
<dependencies>
<dependency>
<groupId>groupId</groupId>
<artifactId>artifactId</artifactId>
<type>test-jar</type>
<version>version</version>
<scope>test</scope>
</dependency>
</dependencies>
...
</project>