1 files changed, 50 insertions, 0 deletions
diff --git a/spec/lib/gitlab/database/async_indexes/index_creator_spec.rb b/spec/lib/gitlab/database/async_indexes/index_creator_spec.rb
new file mode 100644
index 00000000000..b4010d0fe8d
--- /dev/null
+++ b/spec/lib/gitlab/database/async_indexes/index_creator_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Database::AsyncIndexes::IndexCreator do
+  describe '#perform' do
+    subject { described_class.new(async_index) }
+
+    let(:async_index) { create(:postgres_async_index) }
+
+    let(:index_model) { Gitlab::Database::AsyncIndexes::PostgresAsyncIndex }
+
+    let(:connection) { ApplicationRecord.connection }
+
+    context 'when the index already exists' do
+      before do
+        connection.execute(async_index.definition)
+      end
+
+      it 'skips index creation' do
+        expect(connection).not_to receive(:execute).with(/CREATE INDEX/)
+
+        subject.perform
+      end
+    end
+
+    it 'creates the index while controlling statement timeout' do
+      allow(connection).to receive(:execute).and_call_original
+      expect(connection).to receive(:execute).with("SET statement_timeout TO '32400s'").ordered.and_call_original
+      expect(connection).to receive(:execute).with(async_index.definition).ordered.and_call_original
+      expect(connection).to receive(:execute).with("RESET statement_timeout").ordered.and_call_original
+
+      subject.perform
+    end
+
+    it 'removes the index preparation record from postgres_async_indexes' do
+      expect(async_index).to receive(:destroy).and_call_original
+
+      expect { subject.perform }.to change { index_model.count }.by(-1)
+    end
+
+    it 'skips logic if not able to acquire exclusive lease' do
+      expect(subject).to receive(:try_obtain_lease).and_return(false)
+      expect(connection).not_to receive(:execute).with(/CREATE INDEX/)
+      expect(async_index).not_to receive(:destroy)
+
+      expect { subject.perform }.not_to change { index_model.count }
+    end
+  end
+end