final Assembly assembly = new Assembly();
// artifactId is blacklisted, but packaging is not.
final String outputFileNameMapping = "${artifactId}.${packaging}";
final DependencySet set = new DependencySet();
set.setOutputFileNameMapping( outputFileNameMapping );
assembly.addDependencySet( set );
final Assembly outputAssembly = interpolator.interpolate( assembly, project, configSourceStub );
final List<DependencySet> outputDependencySets = outputAssembly.getDependencySets();
assertEquals( 1, outputDependencySets.size() );
final DependencySet outputSet = outputDependencySets.get( 0 );
assertEquals( "${artifactId}.${packaging}", outputSet.getOutputFileNameMapping() );
}