Expose state of hidden epic board lists

- Expose via GraphQL
- Add tests

doc/api/graphql/reference/gitlab_schema.graphql

@@ -9404,6 +9404,16 @@ type EpicAddIssuePayload {
 Represents an epic board
 """
 type EpicBoard {
+  """
+  Whether or not backlog list is hidden.
+  """
+  hideBacklogList: Boolean
+
+  """
+  Whether or not closed list is hidden.
+  """
+  hideClosedList: Boolean
+
   """
   Global ID of the board.
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -25849,6 +25849,34 @@
           "name": "EpicBoard",
           "description": "Represents an epic board",
           "fields": [
+            {
+              "name": "hideBacklogList",
+              "description": "Whether or not backlog list is hidden.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "hideClosedList",
+              "description": "Whether or not closed list is hidden.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "id",
               "description": "Global ID of the board.",

doc/api/graphql/reference/index.md

@@ -1539,6 +1539,8 @@ Represents an epic board.
 
 | Field | Type | Description |
 | ----- | ---- | ----------- |
+| `hideBacklogList` | Boolean | Whether or not backlog list is hidden. |
+| `hideClosedList` | Boolean | Whether or not closed list is hidden. |
 | `id` | BoardsEpicBoardID! | Global ID of the board. |
 | `lists` | EpicListConnection | Epic board lists. |
 | `name` | String | Name of the board. |

ee/app/graphql/types/boards/epic_board_type.rb

@@ -15,6 +15,13 @@ module Types
       field :name, type: GraphQL::STRING_TYPE, null: true,
             description: 'Name of the board.'
 
+      field :hide_backlog_list, type: GraphQL::BOOLEAN_TYPE, null: true,
+            description: 'Whether or not backlog list is hidden.'
+
+      field :hide_closed_list, type: GraphQL::BOOLEAN_TYPE, null: true,
+            description: 'Whether or not closed list is hidden.'
+
+
       field :lists,
             Types::Boards::EpicListType.connection_type,
             null: true,

ee/spec/graphql/types/boards/epic_board_type_spec.rb

@@ -8,7 +8,7 @@ RSpec.describe GitlabSchema.types['EpicBoard'] do
   specify { expect(described_class).to require_graphql_authorizations(:read_epic_board) }
 
   it 'has specific fields' do
-    expected_fields = %w[id name lists]
+    expected_fields = %w[id name lists hideBacklogList hideClosedList]
 
     expect(described_class).to include_graphql_fields(*expected_fields)
   end

ee/spec/requests/api/graphql/boards/epic_boards_query_spec.rb

@@ -7,7 +7,7 @@ RSpec.describe 'get list of epic boards' do
 
   let_it_be(:current_user) { create(:user) }
   let_it_be(:group) { create(:group, :private) }
-  let_it_be(:board1) { create(:epic_board, group: group, name: 'B') }
+  let_it_be(:board1) { create(:epic_board, group: group, name: 'B', hide_closed_list: true, hide_backlog_list: false) }
   let_it_be(:board2) { create(:epic_board, group: group, name: 'A') }
   let_it_be(:board3) { create(:epic_board, group: group, name: 'a') }
 
@@ -50,6 +50,26 @@ RSpec.describe 'get list of epic boards' do
       end
     end
 
+    context 'field values' do
+      let(:query) do
+        graphql_query_for(:group, { fullPath: group.full_path }, query_graphql_field(:epicBoard, { id: board1.to_global_id.to_s }, epic_board_fields))
+      end
+
+      let(:epic_board_fields) do
+        <<~QUERY
+        hideBacklogList
+        hideClosedList
+        QUERY
+      end
+
+      it 'returns the correct values for hiding board lists' do
+        post_graphql(query, current_user: current_user)
+
+        expect(graphql_data.dig('group', 'epicBoard', 'hideBacklogList')).to eq board1.hide_backlog_list
+        expect(graphql_data.dig('group', 'epicBoard', 'hideClosedList')).to eq board1.hide_closed_list
+      end
+    end
+
     context 'when epic_boards flag is disabled' do
       before do
         stub_feature_flags(epic_boards: false)