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I wrote a OpportunityLineItem trigger that works with the OpportunityLineItemSchedule items related to it. Now I want to write unit tests for this trigger, and want to use sfdx to push the code to a scratch org to test things.

However, sfdx force:source:push fails on this (simplified) code:

@isTest

private class OpportunityLineItemTest {

    @isTest static void test() {

        OpportunityLineItemSchedule schedule = new OpportunityLineItemSchedule();

    }

}

with the error:

Invalid type: OpportunityLineItemSchedule

How do I create a unit test for OpportunityLineItem objects that use OpportunityLineItemSchedule objects? Do I need to enable a certain feature in the project-scratch-def.json to be able to use these objects?

You have to enable a Product schedule feature in the project-scratch-def.json, e.g. like this:

{

  "country": "US",

  "edition": "Developer",

  "features": ,

  "orgPreferences": {

    "enabled": [

      "S1DesktopEnabled",

      "IsRevenueScheduleEnabled"

    ],

    "disabled": 

  },

  "orgName": "My Org",

  "adminEmail": "admin@my.org"

}

Once you create the scratch org with IsRevenueScheduleEnabled enabled, the type OpportunityLineItemSchedule will be available in unit tests.