How to mock DynamodbContext BatchWrite for unit testing in net

Question

I have a method that adds Items in the DynamoDb table using DynamoDbContext.

var batchWriteObj = context.CreateBatchWrite<myDynamoDBModel>
                                            (new DynamoDBOperationConfig { TableNamePrefix = "abc" });
                    batchWriteObj.AddPutItem(myDynamoDBModel);

I want to test this piece in my Unit test. Since BatchWrite does not have any constructor, and also its properties are not virtual. I am unable to create a mock for it.

Is there any way I can test this piece of code? maybe by mocking the BatchWrite?

Answer 1

Have you considered using DynamoDB local to run tests? It has the added advantage of validating that your calls are doing what you expect them to do. I created a helper package for it a while back ( https://www.nuget.org/packages/Wadsworth.DynamoDB.TestUtilities/ ). It just manages spinning up the DynamoDB local in a Docker container. You can see the source for ithere , which includes an example.