1 files changed, 66 insertions, 0 deletions
diff --git a/spec/lib/gitlab/database/reindexing_spec.rb b/spec/lib/gitlab/database/reindexing_spec.rb
new file mode 100644
index 00000000000..26954a9a32f
--- /dev/null
+++ b/spec/lib/gitlab/database/reindexing_spec.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Database::Reindexing do
+  describe '.perform' do
+    before do
+      allow(Gitlab::Database::Reindexing::ReindexAction).to receive(:keep_track_of).and_yield
+    end
+
+    shared_examples_for 'reindexing' do
+      before do
+        indexes.zip(reindexers).each do |index, reindexer|
+          allow(Gitlab::Database::Reindexing::ConcurrentReindex).to receive(:new).with(index).and_return(reindexer)
+          allow(reindexer).to receive(:perform)
+        end
+      end
+
+      it 'performs concurrent reindexing for each index' do
+        indexes.zip(reindexers).each do |index, reindexer|
+          expect(Gitlab::Database::Reindexing::ConcurrentReindex).to receive(:new).with(index).ordered.and_return(reindexer)
+          expect(reindexer).to receive(:perform)
+        end
+
+        subject
+      end
+
+      it 'keeps track of actions and creates ReindexAction records' do
+        indexes.each do |index|
+          expect(Gitlab::Database::Reindexing::ReindexAction).to receive(:keep_track_of).with(index).and_yield
+        end
+
+        subject
+      end
+    end
+
+    context 'with multiple indexes' do
+      subject { described_class.perform(indexes) }
+
+      let(:indexes) { [instance_double('Gitlab::Database::PostgresIndex'), instance_double('Gitlab::Database::PostgresIndex')] }
+      let(:reindexers) { [instance_double('Gitlab::Database::Reindexing::ConcurrentReindex'), instance_double('Gitlab::Database::Reindexing::ConcurrentReindex')] }
+
+      it_behaves_like 'reindexing'
+    end
+
+    context 'single index' do
+      subject { described_class.perform(indexes.first) }
+
+      let(:indexes) { [instance_double('Gitlab::Database::PostgresIndex')] }
+      let(:reindexers) { [instance_double('Gitlab::Database::Reindexing::ConcurrentReindex')] }
+
+      it_behaves_like 'reindexing'
+    end
+  end
+
+  describe '.candidate_indexes' do
+    subject { described_class.candidate_indexes }
+
+    it 'retrieves regular indexes that are no left-overs from previous runs' do
+      result = double
+      expect(Gitlab::Database::PostgresIndex).to receive_message_chain('regular.not_match.not_match').with(no_args).with('^tmp_reindex_').with('^old_reindex_').and_return(result)
+
+      expect(subject).to eq(result)
+    end
+  end
+end