 {
    const collection = new tr.model.ObjectCollection({});
    const scopedId = new tr.model.ScopedId('ptr', '0x1000');
    collection.idWasCreated(
        scopedId, 'cat', 'Frame', 10);
    collection.addSnapshot(
        scopedId, 'cat', 'Frame', 10, {foo: 1});
    collection.idWasDeleted(
        scopedId, 'cat', 'Frame', 15);

    collection.updateBounds();
    assert.strictEqual(collection.bounds.min, 10);
    assert.strictEqual(collection.bounds.max, 15);

    const s10 = collection.getSnapshotAt(s