Best Way to mock or stub an integration ( How to set httpResponse object on a dictionary on the fly) inside an expression rule

Question

Hi, 
 I am trying to stub / mock an api response for an http Integration in a expression rule . Basically I am trying to a create a dictionary like what we get on a successful response from an api like below structure 
 
 Dictionary

success - true (Boolean)

result - HttpResponse 
 
 I am able to get first key (success - true) using a!fromJson , but cant find a way to set a successful HttpResponse object to result key through the code . I tried to use a!httpResponse , but it creates a webapiResponse . 
 
 I can see an IntegrationError Object to create such an object for error scenarios. But why there is no IntegrationSuccess object similar to this ? 
 
 a!fromJson(
 "{""success"":true}"
)

Stefan Helzle · Answer

Did you try to create a normal Appian dictionary? 
 {success: true, body: {more goes here}}

Shubham Aware · Answer

You cannot manually construct a true HttpResponse object. It's only created by the system when an integration executes. Define your mock as a plain dictionary structure that mimics the HttpResponse shape: a!localVariables(
 local!mockResponse: a!map(
 statusCode: 200,
 headers: a!map(),
 body: /* your mock data */
 ),
 /* use local!mockResponse in your logic */
) Then write your consuming code to handle either a real HttpResponse or your mock dictionary structure interchangeably.