db.a.drop();
for(i=0;i<60000;i++) { db.a.insert({x:i, y:"asdfasdfasdfasdfasdfasdfasdfasdfasdf"}); }
db.adminCommand('fsync'); // force checkpoint
var collectionSize = db.a.stats().storageSize;
var indexSize = db.a.stats().indexSizes._id_;
print("table size: " + collectionSize);
print("index size: " + indexSize);

print("Remove all docs...");
db.a.remove({});
db.adminCommand('fsync'); // force checkpoint
print("table size: " + db.a.stats().storageSize);
print("index size: " + db.a.stats().indexSizes._id_);

print("Run compact...");
db.a.runCommand('compact');
print("table size: " + db.a.stats().storageSize);
print("index size: " + db.a.stats().indexSizes._id_);
db.adminCommand('fsync'); // force checkpoint

assert.gt(collectionSize, db.a.stats().storageSize, "collection size should be smaller after compact");
assert.gt(indexSize, db.a.stats().indexSizes._id_, "index size should be smaller after compact");