zanstaszek9

@IsTest
public class ParentWithNestedChildrenUtility {
    /**
     * @description Creates an in-memory SObject with nested related (child) records using JSON serialization and deserialization, without DMLs.
     * @param parentRecord The parent SObject record to receive children.
     * @param childrenRecords SObject records to be nested under the parent.
     * @param relationshipFieldName The relationship field name on Parent ('Contacts', 'Opportunities', 'Equipment_Maintenance_Items__r'). Using String, as "SObjectField" type cannot be used due to relationship fields on parent-side are not available that way.
     * @param populateFakeIds If true, fake Ids will be generated and assigned to parent and child records when their Ids are null.
     * @return The deserialized parent SObject with nested children records.