public void EditDocument_UpdatingExsistingDocument()
{
// arrange
var id = "123";
var document = new Person
{
Name = "updated name",
Age = 50
}.ToBsonDocument();
var collection = new MockMongoCollection <BsonDocument>();
var oldDocument = _provider.GetDocumentById(id, collection);
// act
_provider.EditDocument(id, document, collection);
Assert.AreEqual(oldDocument["_id"].AsString, document["_id"].AsString);
Assert.AreNotEqual(oldDocument["name"].AsString, document["name"].AsString);
}