import java.io.*;

File dir = new File( basedir, "target/mid-artifactId-wildcard-massembly570-1-bin/maven-libs" );

File[] files = {
  new File( dir, "maven-clean-plugin-2.4.1.jar" ),
  new File( dir, "maven-jar-plugin-2.3.2.jar")
};

boolean missing = false;
for( int i = 0; i<files.length; i++ )
{
    if ( !files[i].exists() )
    {
        System.out.println( "Missing jar: " + files[i] + " (should be included via wildcard pattern)." );
        missing = true;
    }
}

return !missing;