private List <T> Assert <T>(IMongoQueryable <T> queryable, int resultCount, params string[] expectedStages)
{
var stages = ((AggregateQueryableExecutionModel <T>)queryable.BuildExecutionModel()).Stages;
CollectionAssert.AreEqual(expectedStages.Select(x => BsonDocument.Parse(x)).ToList(), stages);
// async
var results = queryable.ToListAsync().GetAwaiter().GetResult();
results.Count.Should().Be(resultCount);
// sync
results = queryable.ToList();
results.Count.Should().Be(resultCount);
return(results);
}
