private async Task <MongoFixture> hitMongo(MongoFixture fixture)
        {
            await fixture.Start();

            var db = new MongoClient("mongodb://localhost:" + fixture.Ports.Single())
                     .GetDatabase(Guid.NewGuid().ToString());
            await db.CreateCollectionAsync("test");

            await db.GetCollection <Foo>("test")
            .InsertManyAsync(Enumerable.Range(0, 2000).Select(i => new Foo {
                Bar = i
            }));

            return(fixture);
        }