String b =
"b() ::= <<bar>>\n";
writeFile(dir, "a.st", a);
writeFile(dir, "b.st", b);
STGroup group = new STGroupDir(dir);
group.load(); // force load
ST st = group.getInstanceOf("a");
int originalHashCode = System.identityHashCode(st);
group.unload(); // blast cache
st = group.getInstanceOf("a");
int newHashCode = System.identityHashCode(st);