Add creation of iteration lists

This adds creation of iteration lists to the internal JSON endpoint, the
REST API, and GraphQL

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2114,6 +2114,11 @@ input BoardListCreateInput {
   """
   clientMutationId: String
 
+  """
+  Global ID of an existing iteration
+  """
+  iterationId: IterationID
+
   """
   Global ID of an existing label
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -5596,6 +5596,16 @@
               },
               "defaultValue": null
             },
+            {
+              "name": "iterationId",
+              "description": "Global ID of an existing iteration",
+              "type": {
+                "kind": "SCALAR",
+                "name": "IterationID",
+                "ofType": null
+              },
+              "defaultValue": null
+            },
             {
               "name": "assigneeId",
               "description": "Global ID of an existing user",

ee/app/controllers/ee/boards/lists_controller.rb

@@ -13,7 +13,7 @@ module EE
 
       override :list_creation_attrs
       def list_creation_attrs
-        additional_attrs = %i[assignee_id milestone_id]
+        additional_attrs = %i[assignee_id milestone_id iteration_id]
         additional_attrs += EE_MAX_LIMITS_PARAMS if wip_limits_available?
 
         super + additional_attrs
@@ -28,7 +28,7 @@ module EE
 
       override :serialization_attrs
       def serialization_attrs
-        super.merge(user: true, milestone: true).tap do |attrs|
+        super.merge(user: true, milestone: true, iteration: true).tap do |attrs|
           attrs[:only] += EE_MAX_LIMITS_PARAMS if wip_limits_available?
         end
       end

ee/app/finders/iterations_finder.rb

@@ -116,6 +116,8 @@ class IterationsFinder
   end
 
   def by_state(items)
+    return items unless params[:state].present?
+
     Iteration.filter_by_state(items, params[:state])
   end
 

ee/app/graphql/ee/mutations/boards/lists/create.rb

@@ -12,6 +12,9 @@ module EE
             argument :milestone_id, ::Types::GlobalIDType[::Milestone],
                      required: false,
                      description: 'Global ID of an existing milestone'
+            argument :iteration_id, ::Types::GlobalIDType[::Iteration],
+                     required: false,
+                     description: 'Global ID of an existing iteration'
             argument :assignee_id, ::Types::GlobalIDType[::User],
                      required: false,
                      description: 'Global ID of an existing user'
@@ -24,6 +27,7 @@ module EE
             params = super
 
             params[:milestone_id] &&= ::GitlabSchema.parse_gid(params[:milestone_id], expected_type: ::Milestone).model_id
+            params[:iteration_id] &&= ::GitlabSchema.parse_gid(params[:iteration_id], expected_type: ::Iteration).model_id
             params[:assignee_id] &&= ::GitlabSchema.parse_gid(params[:assignee_id], expected_type: ::User).model_id
 
             params
@@ -31,7 +35,7 @@ module EE
 
           override :mutually_exclusive_args
           def mutually_exclusive_args
-            super + [:milestone_id, :assignee_id]
+            super + [:milestone_id, :iteration_id, :assignee_id]
           end
         end
       end

ee/app/models/ee/list.rb

@@ -81,6 +81,10 @@ module EE
         if options.key?(:milestone)
           json[:milestone] = MilestoneSerializer.new.represent(milestone).as_json
         end
+
+        if options.key?(:iteration)
+          json[:iteration] = IterationSerializer.new.represent(iteration).as_json
+        end
       end
     end
 

ee/app/serializers/iteration_serializer.rb

+# frozen_string_literal: true
+
+class IterationSerializer < BaseSerializer
+  entity API::Entities::Iteration
+end

ee/app/services/ee/boards/lists/create_service.rb

@@ -8,6 +8,42 @@ module EE
 
         include MaxLimits
 
+        override :execute
+        def execute(board)
+          return ServiceResponse.error(message: 'iteration_board_lists feature flag is disabled') if type == :iteration && ::Feature.disabled?(:iteration_board_lists, board.resource_parent)
+          return license_validation_error unless valid_license?(board.resource_parent)
+
+          super
+        end
+
+        private
+
+        def valid_license?(parent)
+          license_name = case type
+                         when :assignee
+                           :board_assignee_lists
+                         when :milestone
+                           :board_milestone_lists
+                         when :iteration
+                           :iterations
+                         end
+
+          license_name.nil? || parent.feature_available?(license_name)
+        end
+
+        def license_validation_error
+          message = case type
+                    when :assignee
+                      _('Assignee lists not available with your current license')
+                    when :milestone
+                      _('Milestone lists not available with your current license')
+                    when :iteration
+                      _('Iteration lists not available with your current license')
+                    end
+
+          ServiceResponse.error(message: message)
+        end
+
         override :type
         def type
           # We don't ever expect to have more than one list
@@ -16,6 +52,8 @@ module EE
             :assignee
           elsif params.key?('milestone_id')
             :milestone
+          elsif params.key?('iteration_id')
+            :iteration
           else
             super
           end
@@ -29,6 +67,8 @@ module EE
               find_user(board)
             when :milestone
               find_milestone(board)
+            when :iteration
+              find_iteration(board)
             else
               super
             end
@@ -46,13 +86,16 @@ module EE
           )
         end
 
-        private
-
         def find_milestone(board)
           milestones = milestone_finder(board).execute
           milestones.find_by(id: params['milestone_id']) # rubocop: disable CodeReuse/ActiveRecord
         end
 
+        def find_iteration(board)
+          parent_params = ::IterationsFinder.params_for_parent(board.resource_parent, include_ancestors: true)
+          ::IterationsFinder.new(current_user, parent_params).find_by(id: params['iteration_id']) # rubocop: disable CodeReuse/ActiveRecord
+        end
+
         # rubocop: disable CodeReuse/ActiveRecord
         def find_user(board)
           user_ids = user_finder(board).execute.select(:user_id)

ee/config/feature_flags/development/iteration_board_lists.yml

+---
+name: iteration_board_lists
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/49688
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/250479
+milestone: '13.7'
+type: development
+group: group::project management
+default_enabled: false

ee/lib/api/entities/iteration.rb

+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Iteration < Grape::Entity
+      expose :id, :iid
+      expose :project_id, if: -> (entity, options) { entity&.project_id }
+      expose :group_id, if: -> (entity, options) { entity&.group_id }
+      expose :title, :description
+      expose :state_enum, as: :state
+      expose :created_at, :updated_at
+      expose :start_date, :due_date
+    end
+  end
+end

ee/lib/api/iterations.rb

@@ -19,7 +19,7 @@ module API
       def list_iterations_for(parent)
         iterations = IterationsFinder.new(current_user, iterations_finder_params(parent)).execute
 
-        present paginate(iterations), with: EE::API::Entities::Iteration
+        present paginate(iterations), with: Entities::Iteration
       end
 
       def iterations_finder_params(parent)
@@ -36,7 +36,7 @@ module API
     resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
       desc 'Get a list of project iterations' do
         detail 'This feature was introduced in GitLab 13.5'
-        success EE::API::Entities::Iteration
+        success Entities::Iteration
       end
       params do
         use :list_params
@@ -54,7 +54,7 @@ module API
     resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
       desc 'Get a list of group iterations' do
         detail 'This feature was introduced in GitLab 13.5'
-        success EE::API::Entities::Iteration
+        success Entities::Iteration
       end
       params do
         use :list_params

ee/lib/ee/api/boards_responses.rb

@@ -7,17 +7,13 @@ module EE
 
       prepended do
         helpers do
-          # Overrides API::BoardsResponses create_list_params
-          def create_list_params
-            params.slice(:label_id, :milestone_id, :assignee_id)
-          end
-
           # Overrides API::BoardsResponses list_creation_params
           params :list_creation_params do
             optional :label_id, type: Integer, desc: 'The ID of an existing label'
             optional :milestone_id, type: Integer, desc: 'The ID of an existing milestone'
+            optional :iteration_id, type: Integer, desc: 'The ID of an assignee iteration'
             optional :assignee_id, type: Integer, desc: 'The ID of an assignee'
-            exactly_one_of :label_id, :milestone_id, :assignee_id
+            exactly_one_of :label_id, :milestone_id, :iteration_id, :assignee_id
           end
 
           # Overrides API::BoardsResponses update_params

ee/lib/ee/api/entities/iteration.rb

-# frozen_string_literal: true
-
-module EE
-  module API
-    module Entities
-      class Iteration < Grape::Entity
-        expose :id, :iid
-        expose :project_id, if: -> (entity, options) { entity&.project_id }
-        expose :group_id, if: -> (entity, options) { entity&.group_id }
-        expose :title, :description
-        expose :state_enum, as: :state
-        expose :created_at, :updated_at
-        expose :start_date, :due_date
-      end
-    end
-  end
-end

ee/lib/ee/api/entities/list.rb

@@ -8,6 +8,7 @@ module EE
 
         prepended do
           expose :milestone, using: ::API::Entities::Milestone, if: -> (entity, _) { entity.milestone? }
+          expose :iteration, using: ::API::Entities::Iteration, if: -> (entity, _) { entity.iteration? }
           expose :user, as: :assignee, using: ::API::Entities::UserSafe, if: -> (entity, _) { entity.assignee? }
           expose :max_issue_count, if: -> (list, _) { list.wip_limits_available? }
           expose :max_issue_weight, if: -> (list, _) { list.wip_limits_available? }

ee/lib/ee/api/entities/resource_iteration_event.rb

@@ -13,7 +13,7 @@ module EE
         expose :resource_id do |event, _options|
           event.issuable.id
         end
-        expose :iteration, using: Entities::Iteration
+        expose :iteration, using: ::API::Entities::Iteration
         expose :action
       end
     end

ee/spec/controllers/boards/lists_controller_spec.rb

@@ -52,19 +52,59 @@ RSpec.describe Boards::ListsController do
 
   describe 'POST create' do
     context 'with valid params' do
+      context 'for label lists' do
         it 'returns a successful 200 response' do
           create_board_list user: user, board: board, label_id: label.id
 
           expect(response).to have_gitlab_http_status(:ok)
+          expect(response).to match_response_schema('list', dir: 'ee')
+        end
       end
 
-      it 'returns the created list' do
-        create_board_list user: user, board: board, label_id: label.id
+      context 'for iteration lists' do
+        let_it_be(:iteration) { create(:iteration, group: group) }
+
+        context 'when iteration_board_lists is disabled' do
+          before do
+            stub_feature_flags(iteration_board_lists: false)
+          end
+
+          it 'returns an error' do
+            create_board_list user: user, board: board, iteration_id: iteration.id
+
+            expect(response).to have_gitlab_http_status(:unprocessable_entity)
+            expect(json_response['errors']).to eq(['iteration_board_lists feature flag is disabled'])
+          end
+        end
+
+        context 'when license is available' do
+          before do
+            stub_licensed_features(iterations: true)
+          end
+
+          it 'returns a successful 200 response' do
+            create_board_list user: user, board: board, iteration_id: iteration.id
 
+            expect(response).to have_gitlab_http_status(:ok)
             expect(response).to match_response_schema('list', dir: 'ee')
           end
         end
 
+        context 'when license is unavailable' do
+          before do
+            stub_licensed_features(iterations: false)
+          end
+
+          it 'returns an error' do
+            create_board_list user: user, board: board, iteration_id: iteration.id
+
+            expect(response).to have_gitlab_http_status(:unprocessable_entity)
+            expect(json_response['errors']).to eq(['Iteration lists not available with your current license'])
+          end
+        end
+      end
+    end
+
     context 'with max issue count' do
       context 'with licensed wip limits' do
         it 'returns the created list' do
@@ -166,9 +206,9 @@ RSpec.describe Boards::ListsController do
     end
 
     context 'with invalid params' do
-      context 'when label is nil' do
+      context 'when label is empty' do
         it 'returns an unprocessable entity 422 response' do
-          create_board_list user: user, board: board, label_id: nil
+          create_board_list user: user, board: board, label_id: ''
 
           expect(response).to have_gitlab_http_status(:unprocessable_entity)
           expect(json_response['errors']).to eq(['Label not found'])
@@ -195,12 +235,12 @@ RSpec.describe Boards::ListsController do
       end
     end
 
-    def create_board_list(user:, board:, label_id:, params: {})
+    def create_board_list(user:, board:, label_id: nil, iteration_id: nil, params: {})
       sign_in(user)
 
       post :create, params: {
                       board_id: board.to_param,
-                      list: { label_id: label_id }.merge(params)
+                      list: { label_id: label_id, iteration_id: iteration_id }.compact.merge!(params)
                     },
                     format: :json
     end

ee/spec/finders/iterations_finder_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe IterationsFinder do
 
   context 'without permissions' do
     context 'groups and projects' do
-      let(:params) { { project_ids: project_ids, group_ids: group.id, state: 'all' } }
+      let(:params) { { project_ids: project_ids, group_ids: group.id } }
 
       it 'returns iterations for groups and projects' do
         expect(subject).to be_empty
@@ -34,7 +34,7 @@ RSpec.describe IterationsFinder do
     end
 
     context 'iterations for projects' do
-      let(:params) { { project_ids: project_ids, state: 'all' } }
+      let(:params) { { project_ids: project_ids } }
 
       it 'returns iterations for projects' do
         expect(subject).to contain_exactly(iteration_from_project_1, iteration_from_project_2)
@@ -42,7 +42,7 @@ RSpec.describe IterationsFinder do
     end
 
     context 'iterations for groups' do
-      let(:params) { { group_ids: group.id, state: 'all' } }
+      let(:params) { { group_ids: group.id } }
 
       it 'returns iterations for groups' do
         expect(subject).to contain_exactly(started_group_iteration, upcoming_group_iteration)
@@ -50,7 +50,7 @@ RSpec.describe IterationsFinder do
     end
 
     context 'iterations for groups and project' do
-      let(:params) { { project_ids: project_ids, group_ids: group.id, state: 'all' } }
+      let(:params) { { project_ids: project_ids, group_ids: group.id } }
 
       it 'returns iterations for groups and projects' do
         expect(subject).to contain_exactly(started_group_iteration, upcoming_group_iteration, iteration_from_project_1, iteration_from_project_2)
@@ -69,8 +69,7 @@ RSpec.describe IterationsFinder do
       let(:params) do
         {
           project_ids: project_ids,
-          group_ids: group.id,
-          state: 'all'
+          group_ids: group.id
         }
       end
 
@@ -79,6 +78,12 @@ RSpec.describe IterationsFinder do
         iteration_from_project_1.close
       end
 
+      it 'filters by all states' do
+        params[:state] = 'all'
+
+        expect(subject).to contain_exactly(started_group_iteration, upcoming_group_iteration, iteration_from_project_1, iteration_from_project_2)
+      end
+
       it 'filters by started state' do
         params[:state] = 'started'
 
@@ -154,7 +159,7 @@ RSpec.describe IterationsFinder do
 
     describe '#find_by' do
       it 'finds a single iteration' do
-        finder = described_class.new(user, project_ids: [project_1.id], state: 'all')
+        finder = described_class.new(user, project_ids: [project_1.id])
 
         expect(finder.find_by(iid: iteration_from_project_1.iid)).to eq(iteration_from_project_1)
       end

ee/spec/fixtures/api/schemas/list.json

@@ -5,7 +5,7 @@
       "$ref": "../../../../../spec/fixtures/api/schemas/list.json"
     },
     {
-      "required": ["user"],
+      "required": ["user", "iteration"],
       "properties": {
         "user": {
           "type": [
@@ -44,6 +44,35 @@
               "type": "string"
             }
           }
+        },
+        "iteration": {
+          "type": [
+            "object",
+            "null"
+          ],
+          "required": [
+            "id",
+            "title",
+            "description",
+            "state"
+          ],
+          "properties": {
+            "id": {
+              "type": "integer"
+            },
+            "title": {
+              "type": "string"
+            },
+            "description": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "state": {
+              "type": "integer"
+            }
+          }
         }
       }
     }

ee/spec/graphql/ee/mutations/boards/lists/create_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe Mutations::Boards::Lists::Create do
   end
 
   before do
-    stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true)
+    stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true, iterations: true)
   end
 
   subject { mutation.resolve(board_id: board.to_global_id.to_s, **list_create_params) }
@@ -30,13 +30,13 @@ RSpec.describe Mutations::Boards::Lists::Create do
     it 'raises an error if required arguments are missing' do
       expect { mutation.ready?(board_id: 'some id') }
         .to raise_error(Gitlab::Graphql::Errors::ArgumentError,
-                        'one and only one of backlog or labelId or milestoneId or assigneeId is required')
+                        'one and only one of backlog or labelId or milestoneId or iterationId or assigneeId is required')
     end
 
     it 'raises an error if too many required arguments are specified' do
       expect { mutation.ready?(board_id: 'some id', milestone_id: 'some milestone', assignee_id: 'some label') }
         .to raise_error(Gitlab::Graphql::Errors::ArgumentError,
-                        'one and only one of backlog or labelId or milestoneId or assigneeId is required')
+                        'one and only one of backlog or labelId or milestoneId or iterationId or assigneeId is required')
     end
   end
 
@@ -49,7 +49,7 @@ RSpec.describe Mutations::Boards::Lists::Create do
           it 'returns an error' do
             stub_licensed_features(board_milestone_lists: false)
 
-            expect(subject[:errors]).to include 'List type Milestone lists not available with your current license'
+            expect(subject[:errors]).to include 'Milestone lists not available with your current license'
           end
         end
 
@@ -79,7 +79,7 @@ RSpec.describe Mutations::Boards::Lists::Create do
           it 'returns an error' do
             stub_licensed_features(board_assignee_lists: false)
 
-            expect(subject[:errors]).to include 'List type Assignee lists not available with your current license'
+            expect(subject[:errors]).to include 'Assignee lists not available with your current license'
           end
         end
 
@@ -101,6 +101,45 @@ RSpec.describe Mutations::Boards::Lists::Create do
           end
         end
       end
+
+      describe 'iteration list' do
+        let(:iteration) { create(:iteration, group: group) }
+        let(:list_create_params) { { iteration_id: iteration.to_global_id.to_s } }
+
+        context 'when feature unavailable' do
+          it 'returns an error' do
+            stub_licensed_features(iterations: false)
+
+            expect(subject[:errors]).to include 'Iteration lists not available with your current license'
+          end
+        end
+
+        context 'when feature flag is disabled' do
+          it 'returns an error' do
+            stub_feature_flags(iteration_board_lists: false)
+
+            expect(subject[:errors]).to include 'iteration_board_lists feature flag is disabled'
+          end
+        end
+
+        it 'creates a new issue board list for the iteration' do
+          expect { subject }.to change { board.lists.count }.from(1).to(2)
+
+          new_list = subject[:list]
+
+          expect(new_list.title).to eq "#{iteration.title}"
+          expect(new_list.iteration_id).to eq iteration.id
+          expect(new_list.position).to eq 0
+        end
+
+        context 'when iteration not found' do
+          let(:list_create_params) { { iteration_id: "gid://gitlab/Iteration/#{non_existing_record_id}" } }
+
+          it 'returns an error' do
+            expect(subject[:errors]).to include 'Iteration not found'
+          end
+        end
+      end
     end
 
     context 'without proper permissions' do

ee/spec/requests/api/boards_spec.rb

@@ -4,10 +4,15 @@ require 'spec_helper'
 
 RSpec.describe API::Boards do
   let_it_be(:user) { create(:user) }
-  let_it_be(:board_parent) { create(:project, :public, creator_id: user.id, namespace: user.namespace ) }
+  let_it_be(:group) { create(:group, :public) }
+  let_it_be(:board_parent) { create(:project, :public, group: group ) }
   let_it_be(:milestone) { create(:milestone, project: board_parent) }
   let_it_be(:board) { create(:board, project: board_parent, milestone: milestone, assignee: user) }
 
+  before_all do
+    group.add_maintainer(user)
+  end
+
   it_behaves_like 'multiple and scoped issue boards', "/projects/:id/boards"
 
   before do
@@ -19,6 +24,9 @@ RSpec.describe API::Boards do
 
     it_behaves_like 'milestone board list'
     it_behaves_like 'assignee board list'
+    it_behaves_like 'iteration board list' do
+      let_it_be(:iteration) { create(:iteration, group: group) }
+    end
   end
 
   context 'GET /projects/:id/boards/:board_id with special milestones' do

ee/spec/requests/api/group_boards_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe API::GroupBoards do
   let_it_be(:admin) { create(:user, :admin) }
   let_it_be(:board_parent) { create(:group, :public) }
 
-  before do
+  before_all do
     board_parent.add_owner(user)
   end
 
@@ -54,5 +54,8 @@ RSpec.describe API::GroupBoards do
 
     it_behaves_like 'milestone board list'
     it_behaves_like 'assignee board list'
+    it_behaves_like 'iteration board list' do
+      let_it_be(:iteration) { create(:iteration, group: board_parent) }
+    end
   end
 end

ee/spec/services/ee/boards/lists/create_service_spec.rb

@@ -4,8 +4,9 @@ require 'spec_helper'
 
 RSpec.describe Boards::Lists::CreateService do
   describe '#execute' do
-    let_it_be(:project) { create(:project) }
-    let_it_be(:board) { create(:board, project: project) }
+    let_it_be(:group) { create(:group) }
+    let_it_be(:project) { create(:project, group: group) }
+    let_it_be(:board, refind: true) { create(:board, project: project) }
     let_it_be(:user) { create(:user) }
 
     context 'when assignee_id param is sent' do
@@ -31,7 +32,6 @@ RSpec.describe Boards::Lists::CreateService do
     end
 
     context 'when milestone_id param is sent' do
-      let_it_be(:user) { create(:user) }
       let_it_be(:milestone) { create(:milestone, project: project) }
 
       before_all do
@@ -52,6 +52,56 @@ RSpec.describe Boards::Lists::CreateService do
       end
     end
 
+    context 'when iteration_id param is sent' do
+      let_it_be(:iteration) { create(:iteration, group: group) }
+
+      before_all do
+        group.add_developer(user)
+      end
+
+      subject(:service) { described_class.new(project, user, 'iteration_id' => iteration.id) }
+
+      before do
+        stub_licensed_features(iterations: true)
+      end
+
+      it 'creates an iteration list when param is valid' do
+        response = service.execute(board)
+
+        expect(response.success?).to eq(true)
+        expect(response.payload[:list].list_type).to eq('iteration')
+      end
+
+      context 'when iteration is from another group' do
+        let_it_be(:iteration) { create(:iteration) }
+
+        it 'returns an error' do
+          response = service.execute(board)
+
+          expect(response.success?).to eq(false)
+          expect(response.errors).to include('Iteration not found')
+        end
+      end
+
+      it 'returns an error when feature flag is disabled' do
+        stub_feature_flags(iteration_board_lists: false)
+
+        response = service.execute(board)
+
+        expect(response.success?).to eq(false)
+        expect(response.errors).to include('iteration_board_lists feature flag is disabled')
+      end
+
+      it 'returns an error when license is unavailable' do
+        stub_licensed_features(iterations: false)
+
+        response = service.execute(board)
+
+        expect(response.success?).to eq(false)
+        expect(response.errors).to include('Iteration lists not available with your current license')
+      end
+    end
+
     context 'max limits' do
       describe '#create_list_attributes' do
         shared_examples 'attribute provider for list creation' do
@@ -90,7 +140,7 @@ RSpec.describe Boards::Lists::CreateService do
             it 'contains the expected max limits' do
               service = described_class.new(project, user, params)
 
-              attrs = service.create_list_attributes(nil, nil, nil)
+              attrs = service.send(:create_list_attributes, nil, nil, nil)
 
               if wip_limits_enabled
                 expect(attrs).to include(max_issue_count: expected_max_issue_count,

ee/spec/support/shared_examples/requests/api/assignee_board_list_shared_examples.rb

 # frozen_string_literal: true
 
 RSpec.shared_examples 'assignee board list' do
+  before do
+    stub_licensed_features(board_assignee_lists: true)
+  end
+
   context 'when assignee_id is sent' do
     it 'returns 400 if user is not found' do
       other_user = create(:user)
@@ -17,12 +21,10 @@ RSpec.shared_examples 'assignee board list' do
 
       expect(response).to have_gitlab_http_status(:bad_request)
       expect(json_response.dig('message', 'error'))
-          .to eq('List type Assignee lists not available with your current license')
+          .to eq('Assignee lists not available with your current license')
     end
 
     it 'creates an assignee list if user is found' do
-      stub_licensed_features(board_assignee_lists: true)
-
       post api(url, user), params: { assignee_id: user.id }
 
       expect(response).to have_gitlab_http_status(:created)

ee/spec/support/shared_examples/requests/api/iteration_board_list_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'iteration board list' do
+  before do
+    stub_licensed_features(iterations: true)
+  end
+
+  context 'when iteration_id is sent' do
+    it 'returns 400 if iteration is not found' do
+      other_iteration = create(:iteration)
+      post api(url, user), params: { iteration_id: other_iteration.id }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response.dig('message', 'error')).to eq('Iteration not found')
+    end
+
+    it 'returns 400 if feature flag is disabled' do
+      stub_feature_flags(iteration_board_lists: false)
+
+      post api(url, user), params: { iteration_id: iteration.id }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response.dig('message', 'error')).to eq('iteration_board_lists feature flag is disabled')
+    end
+
+    it 'returns 400 if not licensed' do
+      stub_licensed_features(iterations: false)
+
+      post api(url, user), params: { iteration_id: iteration.id }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response.dig('message', 'error'))
+          .to eq('Iteration lists not available with your current license')
+    end
+
+    it 'creates an iteration list if iteration is found' do
+      post api(url, user), params: { iteration_id: iteration.id }
+
+      expect(response).to have_gitlab_http_status(:created)
+      expect(json_response.dig('iteration', 'id')).to eq(iteration.id)
+    end
+  end
+end

ee/spec/support/shared_examples/requests/api/milestone_board_list_shared_examples.rb

 # frozen_string_literal: true
 
 RSpec.shared_examples 'milestone board list' do
+  before do
+    stub_licensed_features(board_milestone_lists: true)
+  end
+
   context 'when milestone_id is sent' do
     it 'returns 400 if milestone is not found' do
       other_milestone = create(:milestone)
@@ -17,12 +21,10 @@ RSpec.shared_examples 'milestone board list' do
 
       expect(response).to have_gitlab_http_status(:bad_request)
       expect(json_response.dig('message', 'error'))
-        .to eq('List type Milestone lists not available with your current license')
+        .to eq('Milestone lists not available with your current license')
     end
 
     it 'creates a milestone list if milestone is found' do
-      stub_licensed_features(board_milestone_lists: true)
-
       post api(url, user), params: { milestone_id: milestone.id }
 
       expect(response).to have_gitlab_http_status(:created)

lib/api/boards_responses.rb

@@ -45,7 +45,7 @@ module API
 
         def create_list
           create_list_service =
-            ::Boards::Lists::CreateService.new(board_parent, current_user, create_list_params)
+            ::Boards::Lists::CreateService.new(board_parent, current_user, declared_params.compact.with_indifferent_access)
 
           response = create_list_service.execute(board)
 
@@ -56,10 +56,6 @@ module API
           end
         end
 
-        def create_list_params
-          params.slice(:label_id)
-        end
-
         def move_list(list)
           move_list_service =
             ::Boards::Lists::MoveService.new(board_parent, current_user, { position: params[:position].to_i })

spec/fixtures/api/schemas/list.json

@@ -10,7 +10,7 @@
     "id": { "type": "integer" },
     "list_type": {
       "type": "string",
-      "enum": ["backlog", "label", "closed"]
+      "enum": ["backlog", "label", "iteration", "closed"]
     },
     "label": {
       "type": ["object", "null"],