import java.io.*;
import java.util.jar.*;

String[] wanted =
{
    "test.xml",
};

JarFile jarFile = new JarFile( new File( basedir, "target/test-1.0.jar" ) );

for ( String path : wanted )
{
    if ( jarFile.getEntry( path ) == null )
    {
        throw new IllegalStateException( "wanted path is missing: " + path );
    }
}

jarFile.close();