1 files changed, 50 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/steal_migrate_merge_request_diff_commit_users_spec.rb b/spec/lib/gitlab/background_migration/steal_migrate_merge_request_diff_commit_users_spec.rb
new file mode 100644
index 00000000000..f2fb2ab6b6e
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/steal_migrate_merge_request_diff_commit_users_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::StealMigrateMergeRequestDiffCommitUsers do
+  let(:migration) { described_class.new }
+
+  describe '#perform' do
+    it 'processes the background migration' do
+      spy = instance_spy(
+        Gitlab::BackgroundMigration::MigrateMergeRequestDiffCommitUsers
+      )
+
+      allow(Gitlab::BackgroundMigration::MigrateMergeRequestDiffCommitUsers)
+        .to receive(:new)
+        .and_return(spy)
+
+      expect(spy).to receive(:perform).with(1, 4)
+      expect(migration).to receive(:schedule_next_job)
+
+      migration.perform(1, 4)
+    end
+  end
+
+  describe '#schedule_next_job' do
+    it 'schedules the next job in ascending order' do
+      Gitlab::Database::BackgroundMigrationJob.create!(
+        class_name: 'MigrateMergeRequestDiffCommitUsers',
+        arguments: [10, 20]
+      )
+
+      Gitlab::Database::BackgroundMigrationJob.create!(
+        class_name: 'MigrateMergeRequestDiffCommitUsers',
+        arguments: [40, 50]
+      )
+
+      expect(BackgroundMigrationWorker)
+        .to receive(:perform_in)
+        .with(5.minutes, 'StealMigrateMergeRequestDiffCommitUsers', [10, 20])
+
+      migration.schedule_next_job
+    end
+
+    it 'does not schedule any new jobs when there are none' do
+      expect(BackgroundMigrationWorker).not_to receive(:perform_in)
+
+      migration.schedule_next_job
+    end
+  end
+end