1 files changed, 33 insertions, 0 deletions
diff --git a/spec/migrations/schedule_populate_issue_email_participants_spec.rb b/spec/migrations/schedule_populate_issue_email_participants_spec.rb
new file mode 100644
index 00000000000..a3f18617b70
--- /dev/null
+++ b/spec/migrations/schedule_populate_issue_email_participants_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20201128210234_schedule_populate_issue_email_participants.rb')
+
+RSpec.describe SchedulePopulateIssueEmailParticipants do
+  let!(:namespace) { table(:namespaces).create!(name: 'namespace', path: 'namespace') }
+  let!(:project) { table(:projects).create!(id: 1, namespace_id: namespace.id) }
+  let!(:issue1) { table(:issues).create!(id: 1, project_id: project.id, service_desk_reply_to: "a@gitlab.com") }
+  let!(:issue2) { table(:issues).create!(id: 2, project_id: project.id) }
+  let!(:issue3) { table(:issues).create!(id: 3, project_id: project.id, service_desk_reply_to: "b@gitlab.com") }
+  let!(:issue4) { table(:issues).create!(id: 4, project_id: project.id, service_desk_reply_to: "c@gitlab.com") }
+  let!(:issue5) { table(:issues).create!(id: 5, project_id: project.id, service_desk_reply_to: "d@gitlab.com") }
+  let(:issue_email_participants) { table(:issue_email_participants) }
+
+  it 'correctly schedules background migrations' do
+    stub_const("#{described_class.name}::BATCH_SIZE", 2)
+
+    Sidekiq::Testing.fake! do
+      freeze_time do
+        migrate!
+
+        expect(described_class::MIGRATION)
+          .to be_scheduled_delayed_migration(2.minutes, 1, 3)
+
+        expect(described_class::MIGRATION)
+          .to be_scheduled_delayed_migration(4.minutes, 4, 5)
+
+        expect(BackgroundMigrationWorker.jobs.size).to eq(2)
+      end
+    end
+  end
+end