adds test to check whether or not an email is sent to label subscribers after creating a new issue through the api

lib/api/issues.rb

@@ -154,35 +154,22 @@ module API
           render_api_error!({ labels: errors }, 400)
         end
 
+        # Find or create labels
         if params[:labels].present?
-          params[:labels] = params[:labels].split(",").each { |word| word.strip! }
-          attrs[:label_ids] = []
-
-          params[:labels].each do |label|
-            existing_label = user_project.labels.where(title: label).first
-
-            unless existing_label.nil?
-              attrs[:label_ids] << existing_label.id
-              params[:labels].delete(label)
-            end
+          attrs[:label_ids] = params[:labels].split(",").map do |label_name|
+            user_project.labels.create_with(color: Label::DEFAULT_COLOR)
+                               .find_or_create_by(title: label_name.strip)
+                               .id
           end
         end
 
-        project = user_project
-
-        issue = ::Issues::CreateService.new(project, current_user, attrs.merge(request: request, api: true)).execute
+        issue = ::Issues::CreateService.new(user_project, current_user, attrs.merge(request: request, api: true)).execute
 
         if issue.spam?
           render_api_error!({ error: 'Spam detected' }, 400)
         end
 
         if issue.valid?
-          # create new labels and attach to issue. Labels are valid because
-          # we already checked its name, so there can't be an error here
-          if params[:labels].present?
-            issue.add_labels_by_names(params[:labels])
-          end
-
           present issue, with: Entities::Issue, current_user: current_user
         else
           render_validation_error!(issue)

spec/requests/api/issues_spec.rb

@@ -2,6 +2,7 @@ require 'spec_helper'
 
 describe API::API, api: true  do
   include ApiHelpers
+
   let(:user)        { create(:user) }
   let(:user2)       { create(:user) }
   let(:non_member)  { create(:user) }
@@ -478,6 +479,18 @@ describe API::API, api: true  do
       expect(json_response['labels']).to eq(['label', 'label2'])
     end
 
+    it "emails label subscribers" do
+      clear_enqueued_jobs
+      label = project.labels.first
+      label.toggle_subscription(user2)
+
+      expect do
+        post api("/projects/#{project.id}/issues", user),
+          title: 'new issue', labels: label.title
+      end.to change{enqueued_jobs.size}.by(1)
+      expect(response.status).to eq(201)
+    end
+
     it "returns a 400 bad request if title not given" do
       post api("/projects/#{project.id}/issues", user), labels: 'label, label2'
       expect(response).to have_http_status(400)