mongo/jstests/extent.js

t = db.reclaimExtentsTest;
t.drop();

for ( var i=0; i<50; i++ ) { // enough iterations to break 32 bit.
    db.createCollection('reclaimExtentsTest', { size : 100000000 });
    t.insert({x:1});
    assert( t.count() == 1 );
    t.drop();
}

db.dropDatabase();