DynamoDb Integration tests

[lezzi]

Automate local in-memory dynamodb start to simplify writing integration tests. It can also be used as an alternative to mocking the fluent API.

Something like:

await using var inMemoryContext = InMemoryDynamoDbFactory.CreateAsync();

// Use inMemoryContext as a regular context

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.DownloadingAndRunning.html

[Newp]

#172

This issue will help to conduct an integration test.

I test using github action, and because github can use docker-in-docker, local dynamodb is performed on the step of github action, and in the unit test, a client-server environment very similar to the real environment such as a separate in memory context is created.

• In a docker-in-docker environment, it is recommended to run the docker run before .net core installation because it takes time before the container image is completely warmed up.

• Below is the github flow that I am actually using.

`
name: xxx UnitTest

on:
pull_request:

jobs:
unittest:
runs-on: ubuntu-latest
defaults:
run :
working-directory: ./server

steps:
- uses: actions/checkout@v2

- name : Run Docker Images
  run: docker-compose -f ./docker-compose-unittest.yml up -d
  working-directory: ./docker

- name: Setup .NET Core
  uses: actions/setup-dotnet@v1
  with:
    dotnet-version: 3.1.301

- name: Install dependencies
  run: dotnet restore

- name: Build
  run: dotnet build --configuration Release --no-restore

- name: curl - dynamodb
  run : curl http://localhost:8000

- name: Test
  run: dotnet test`