How to generate JUnit sources using maven-gunit-plugin - maven-2

Question

I have maven configured to run gunit (an ANTLR grammar unit testing tool) through the maven-gunit-plugin. gunit, however, has two different modes. The first mode causes gunit to act as an interpreter, reading through the *.gunit (or *.testsuite) file, interpreting it, and displaying the results. It can be configured as such:
<plugin>
<groupId>org.antlr</groupId>
<artifactId>maven-gunit-plugin</artifactId>
<version>3.1.3</version>
<executions>
<execution>
<id>maven-gunit-plugin</id>
<phase>test</phase>
<goals>
<goal>gunit</goal>
</goals>
</execution>
</executions>
</plugin>
The second mode causes gunit to generate source code that can be run by JUnit. How can I instruct the maven-gunit-plugin to generate JUnit sources instead of acting as an interpreter?
A few notes:
I can change the test phase to "generate-test-sources" to cause the maven plugin to run at the correct time.
I couldn't find any useful documentation on the maven-gunit-plugin
I've seen people use exec-maven-plugin to run gunit with a specific command line option, but I'm not looking to do that.
EDIT / RESOLUTION:
After reading the various responses, I downloaded the ANTLR source code, which includes the maven-gunit-plugin. The plugin does not support junit generation. It turns out that the codehaus snapshot of the gunit-maven-plugin and the exec plugin are currently the only options.

Answer 1

I found a discussion through MNG-4039 that is illustrated with a maven-gunit-plugin gunit-maven-plugin sample. I'll let you read the whole article but, according to the author, you should end up with something like this:
<dependencies>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr-runtime</artifactId>
<version>3.1.1</version>
</dependency>
<!-- Here is the 'extra' dep -->
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr</artifactId>
<version>3.1.1</version>
<!-- we try to use scope to hide it from transitivity -->
<scope>test</scope> <!-- or perhaps 'provided' (see later discussion) or 'import' (maven >= 2.0.9) -->
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gunit-maven-plugin</artifactId>
<version>1.0.0-SNAPSHOT</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
I didn't test this configuration myself and can't thus confirm everything is working out of the box. I don't even know if the plugin has been released in a non SNAPSHOT version. The only thing I can confirm is that it seems indeed very hard to find "real" documentation about the maven-gunit-plugin.

Answer 2

There is sad news here
I found out so far there is no
GUnit-functionality (be it JUnit
Test-Generation or direct invocation
of GUnit) for maven right now. I
already mailed with Jim Idle concering
the state of GUnit in the
antlr3-maven-plugin and learned that
there is a patch to the old version of
the maven-plugin waiting in the queue.
I think this workaround that is the only option.