Improve specs for background stage_id ref migration

db/post_migrate/20170628080858_migrate_stage_id_reference_in_background.rb

@@ -12,13 +12,12 @@ class MigrateStageIdReferenceInBackground < ActiveRecord::Migration
   end
   def up
-    Build.where(stage_id: nil)
-      .in_batches(of: BATCH_SIZE) do |relation, index|
-        schedule = index * 5.minutes
-        jobs = relation.pluck(:id).map { |id| [MIGRATION, [id]] }
-        BackgroundMigrationWorker.perform_bulk_in(schedule, jobs)
-      end
+    Build.where(stage_id: nil).in_batches(of: BATCH_SIZE) do |relation, index|
+      schedule = index * 5.minutes
+      jobs = relation.pluck(:id).map { |id| [MIGRATION, [id]] }
+      BackgroundMigrationWorker.perform_bulk_in(schedule, jobs)
+    end
   end
   def down

spec/migrations/migrate_stage_id_reference_in_background_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 require Rails.root.join('db', 'post_migrate', '20170628080858_migrate_stage_id_reference_in_background')
 describe MigrateStageIdReferenceInBackground, :migration, :sidekiq do
-  matcher :have_scheduled_migration do |delay, *expected|
+  matcher :be_scheduled_migration do |delay, *expected|
     match do |migration|
       BackgroundMigrationWorker.jobs.any? do |job|
         job['args'] == [migration, expected] &&
@@ -24,16 +24,22 @@ describe MigrateStageIdReferenceInBackground, :migration, :sidekiq do
     stub_const('MigrateStageIdReferenceInBackground::BATCH_SIZE', 2)
     projects.create!(id: 123, name: 'gitlab1', path: 'gitlab1')
+    projects.create!(id: 345, name: 'gitlab2', path: 'gitlab2')
+
     pipelines.create!(id: 1, project_id: 123, ref: 'master', sha: 'adf43c3a')
+    pipelines.create!(id: 2, project_id: 345, ref: 'feature', sha: 'cdf43c3c')
     jobs.create!(id: 1, commit_id: 1, project_id: 123, stage_idx: 2, stage: 'build')
     jobs.create!(id: 2, commit_id: 1, project_id: 123, stage_idx: 2, stage: 'build')
     jobs.create!(id: 3, commit_id: 1, project_id: 123, stage_idx: 1, stage: 'test')
     jobs.create!(id: 4, commit_id: 1, project_id: 123, stage_idx: 3, stage: 'deploy')
+    jobs.create!(id: 5, commit_id: 2, project_id: 345, stage_idx: 1, stage: 'test')
     stages.create(id: 101, pipeline_id: 1, project_id: 123, name: 'test')
     stages.create(id: 102, pipeline_id: 1, project_id: 123, name: 'build')
     stages.create(id: 103, pipeline_id: 1, project_id: 123, name: 'deploy')
+
+    jobs.create!(id: 6, commit_id: 2, project_id: 345, stage_id: 101, stage_idx: 1, stage: 'test')
   end
   it 'correctly schedules background migrations' do
@@ -41,10 +47,11 @@ describe MigrateStageIdReferenceInBackground, :migration, :sidekiq do
       Timecop.freeze do
         migrate!
-        expect(described_class::MIGRATION).to have_scheduled_migration(5.minutes, 1)
-        expect(described_class::MIGRATION).to have_scheduled_migration(5.minutes, 2)
-        expect(described_class::MIGRATION).to have_scheduled_migration(10.minutes, 3)
-        expect(described_class::MIGRATION).to have_scheduled_migration(10.minutes, 4)
+        expect(described_class::MIGRATION).to be_scheduled_migration(5.minutes, 1)
+        expect(described_class::MIGRATION).to be_scheduled_migration(5.minutes, 2)
+        expect(described_class::MIGRATION).to be_scheduled_migration(10.minutes, 3)
+        expect(described_class::MIGRATION).to be_scheduled_migration(10.minutes, 4)
+        expect(BackgroundMigrationWorker.jobs.size).to eq 5
       end
     end
   end
@@ -55,7 +62,7 @@ describe MigrateStageIdReferenceInBackground, :migration, :sidekiq do
       migrate!
-      expect(jobs.where(stage_id: nil)).to be_empty
+      expect(jobs.where(stage_id: nil)).to be_one
     end
   end
 end