Add task count and completed count to graphql types

Add specs for task completion status (graphql)

Fix style issues

Changed format of constants in spec

Refactor specs to reduce creation of records

Reduce parameters to merge request creation

Use set's for project and user

Move let's out of it_behaves_like block

Fix description parameter

Fix format of lets

Use dig to get task completion status out of graphql response

Modified rspec output

Add changelog entry

app/graphql/types/issue_type.rb

@@ -49,5 +49,7 @@ module Types
 
     field :created_at, Types::TimeType, null: false
     field :updated_at, Types::TimeType, null: false
+
+    field :task_completion_status, Types::TaskCompletionStatus, null: false
   end
 end

app/graphql/types/merge_request_type.rb

@@ -53,5 +53,7 @@ module Types
     field :head_pipeline, Types::Ci::PipelineType, null: true, method: :actual_head_pipeline
     field :pipelines, Types::Ci::PipelineType.connection_type,
           resolver: Resolvers::MergeRequestPipelinesResolver
+
+    field :task_completion_status, Types::TaskCompletionStatus, null: false
   end
 end

app/graphql/types/task_completion_status.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Types
+  class TaskCompletionStatus < BaseObject
+    graphql_name 'TaskCompletionStatus'
+    description 'Completion status of tasks'
+
+    field :count, GraphQL::INT_TYPE, null: false
+    field :completed_count, GraphQL::INT_TYPE, null: false
+  end
+end

changelogs/unreleased/62910-task-completion-status-gql-pderichs.yml

@@ -0,0 +1,5 @@
+---
+title: Make task completion status available via GraphQL
+merge_request:
+author:
+type: added

spec/requests/api/graphql/tasks/task_completion_status_spec.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'getting task completion status information' do
+  include GraphqlHelpers
+
+  DESCRIPTION_0_DONE = '- [ ] task 1\n- [ ] task 2'
+  DESCRIPTION_1_DONE = '- [x] task 1\n- [ ] task 2'
+  DESCRIPTION_2_DONE = '- [x] task 1\n- [x] task 2'
+
+  set(:user1) { create(:user) }
+  set(:project) { create(:project, :repository, :public) }
+
+  let(:fields) do
+    <<~QUERY
+    taskCompletionStatus {
+      count,
+      completedCount
+    }
+    QUERY
+  end
+
+  def create_task_completion_status_query_for(type, iid)
+    graphql_query_for(
+      'project',
+        { 'fullPath' => project.full_path },
+        query_graphql_field(type, { iid: iid }, fields)
+    )
+  end
+
+  shared_examples_for 'graphql task completion status provider' do |type|
+    it 'returns the expected task completion status' do
+      post_graphql(create_task_completion_status_query_for(type, item.iid), current_user: user1)
+
+      expect(response).to have_gitlab_http_status(200)
+
+      task_completion_status = graphql_data.dig('project', type, 'taskCompletionStatus')
+      expect(task_completion_status).not_to be_nil
+      expect(task_completion_status['count']).to eq(item.task_completion_status[:count])
+      expect(task_completion_status['completedCount']).to eq(item.task_completion_status[:completed_count])
+    end
+  end
+
+  [DESCRIPTION_0_DONE, DESCRIPTION_1_DONE, DESCRIPTION_2_DONE].each do |desc|
+    context "with description #{desc}" do
+      context 'when type is issue' do
+        it_behaves_like 'graphql task completion status provider', 'issue' do
+          let(:item) { create(:issue, project: project, description: desc) }
+        end
+      end
+
+      context 'when type is merge request' do
+        it_behaves_like 'graphql task completion status provider', 'mergeRequest' do
+          let(:item) { create(:merge_request, author: user1, source_project: project, description: desc) }
+        end
+      end
+    end
+  end
+end

spec/support/helpers/graphql_helpers.rb

@@ -157,7 +157,7 @@ module GraphqlHelpers
     when Array # multiplexed queries
       json_response.map { |response| response['errors'] }
     else
-      raise "Unkown GraphQL response type #{json_response.class}"
+      raise "Unknown GraphQL response type #{json_response.class}"
     end
   end