用嵌套的异步异步调用测试异步mobX动作

Question

我有一个位于mobX存储中的方法，该方法最好由下面的示例代表。

ServiceRole:
  Type: "AWS::IAM::Role"
  Properties:
    RoleName:
      Ref: StackName
    AssumeRolePolicyDocument:
      Version: "2012-10-17"
      Statement:
      - Effect: "Allow"
        Principal:
          Service:
          - "ec2.amazonaws.com"
        Action:
        - "sts:AssumeRole"
    Path: "/"
    Policies:
    - PolicyName:
        Ref: StackName
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Action:
              - dynamodb:PutItem
            Resource:
              Fn::GetAtt: [Table, Arn]

通过jest通过这么多嵌套的异步调用对单元进行测试的最佳方法是什么？