Fixes #2694 - Zendesk import doesn't consider all tickets.

lib/sequencer/unit/import/zendesk/mixin/incremental_export.rb

@@ -0,0 +1,20 @@
+class Sequencer
+  class Unit
+    module Import
+      module Zendesk
+        module Mixin
+          module IncrementalExport
+
+            def self.included(base)
+              base.uses :client
+            end
+
+            def resource_collection
+              "::ZendeskAPI::#{resource_klass}".constantize.incremental_export(client, 1)
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/sequencer/unit/import/zendesk/organizations.rb

@@ -3,6 +3,7 @@ class Sequencer
     module Import
       module Zendesk
         class Organizations < Sequencer::Unit::Import::Zendesk::SubSequence::Object
+          include ::Sequencer::Unit::Import::Zendesk::Mixin::IncrementalExport
 
           private
 

lib/sequencer/unit/import/zendesk/sub_sequence/base.rb

@@ -13,6 +13,7 @@ class Sequencer
 
             def self.included(base)
               base.extend(ClassMethods)
+
               base.uses :dry_run, :import_job
             end
 

lib/sequencer/unit/import/zendesk/tickets.rb

@@ -3,6 +3,7 @@ class Sequencer
     module Import
       module Zendesk
         class Tickets < Sequencer::Unit::Import::Zendesk::SubSequence::Object
+          include ::Sequencer::Unit::Import::Zendesk::Mixin::IncrementalExport
 
           uses :user_map, :organization_map, :group_map, :ticket_field_map
 

lib/sequencer/unit/import/zendesk/users.rb

@@ -3,6 +3,7 @@ class Sequencer
     module Import
       module Zendesk
         class Users < Sequencer::Unit::Import::Zendesk::SubSequence::Object
+          include ::Sequencer::Unit::Import::Zendesk::Mixin::IncrementalExport
 
           uses :organization_map, :group_map, :user_group_map
 

spec/lib/sequencer/unit/import/zendesk/sub_sequence/base_examples.rb

@@ -2,6 +2,13 @@ RSpec.shared_examples 'Sequencer::Unit::Import::Zendesk::SubSequence::Base' do
   describe 'error handling' do
     before do
       allow(params[:client]).to receive(collection_name).and_return(client_collection)
+
+      # if method 'incremental_export' is defined in class add additional receive via incremental_export
+      # for Users, Tickets and Organizations we are using Mixin 'IncrementalExport' to get the correct resource_collection method
+      if "ZendeskAPI/#{collection_name}".classify.safe_constantize.respond_to?(:incremental_export)
+        allow("ZendeskAPI/#{collection_name}".classify.safe_constantize).to receive(:incremental_export).and_return(client_collection)
+      end
+
       allow(client_collection).to receive(:all!).and_raise(api_error)
     end