1 files changed, 56 insertions, 0 deletions
diff --git a/spec/lib/gitlab/database/schema_validation/indexes_spec.rb b/spec/lib/gitlab/database/schema_validation/indexes_spec.rb
new file mode 100644
index 00000000000..4351031a4b4
--- /dev/null
+++ b/spec/lib/gitlab/database/schema_validation/indexes_spec.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Database::SchemaValidation::Indexes, feature_category: :database do
+  let(:structure_file_path) { Rails.root.join('spec/fixtures/structure.sql') }
+  let(:database_indexes) do
+    [
+      ['wrong_index', 'CREATE UNIQUE INDEX wrong_index ON public.table_name (column_name)'],
+      ['extra_index', 'CREATE INDEX extra_index ON public.table_name (column_name)'],
+      ['index', 'CREATE UNIQUE INDEX "index" ON public.achievements USING btree (namespace_id, lower(name))']
+    ]
+  end
+
+  let(:database_name) { 'main' }
+
+  let(:database_model) { Gitlab::Database.database_base_models[database_name] }
+
+  let(:connection) { database_model.connection }
+
+  let(:query_result) { instance_double('ActiveRecord::Result', rows: database_indexes) }
+
+  let(:database) { Gitlab::Database::SchemaValidation::Database.new(connection) }
+  let(:structure_file) { Gitlab::Database::SchemaValidation::StructureSql.new(structure_file_path) }
+
+  subject(:schema_validation) { described_class.new(structure_file, database) }
+
+  before do
+    allow(connection).to receive(:exec_query).and_return(query_result)
+  end
+
+  describe '#missing_indexes' do
+    it 'returns missing indexes' do
+      missing_indexes = %w[
+        missing_index
+        index_namespaces_public_groups_name_id
+        index_on_deploy_keys_id_and_type_and_public
+        index_users_on_public_email_excluding_null_and_empty
+      ]
+
+      expect(schema_validation.missing_indexes).to match_array(missing_indexes)
+    end
+  end
+
+  describe '#extra_indexes' do
+    it 'returns extra indexes' do
+      expect(schema_validation.extra_indexes).to match_array(['extra_index'])
+    end
+  end
+
+  describe '#wrong_indexes' do
+    it 'returns wrong indexes' do
+      expect(schema_validation.wrong_indexes).to match_array(['wrong_index'])
+    end
+  end
+end