tdbs = "test";
tcs = "foo";
tdbcs = tdbs + "." + tcs;

tdb = db.getSiblingDB(tdbs);
tc = tdb.getCollection(tcs);
adb = db.getSiblingDB('admin');
cdb = db.getSiblingDB("config");
cc = cdb.getCollection("chunks");

tdb.dropDatabase();

sh.enableSharding(tdbs);
tc.createIndex({a: 1});
sh.shardCollection(tdbcs, {a: 1});

function getRandom() {
    let r = "";
    for (let i = 0; i < 100; i++) {
        r = r + Math.random().toString().substr(2);
    }
    return r;
}

niter = 10;
nperiter = 10000;

for (let k = 0; k < niter; k++) {
    let doc = [];
    let base = k * nperiter;
    for (let i = base; i < (base + nperiter); i++) {
        doc[i] = {a: i, b: getRandom()};
    }
    tc.insertMany(doc);
}
// TypeError: Cannot use 'in' operator to search for 'insertOne' in undefined