Added benchmark for IssuesFinder

spec/benchmarks/finders/issues_finder_spec.rb

+require 'spec_helper'
+
+describe IssuesFinder, benchmark: true do
+  describe '#execute' do
+    let(:user) { create(:user) }
+    let(:project) { create(:project, :public) }
+
+    let(:label1) { create(:label, project: project, title: 'A') }
+    let(:label2) { create(:label, project: project, title: 'B') }
+
+    before do
+      10.times do |n|
+        issue = create(:issue, author: user, project: project)
+
+        if n > 4
+          create(:label_link, label: label1, target: issue)
+          create(:label_link, label: label2, target: issue)
+        end
+      end
+    end
+
+    describe 'retrieving issues without labels' do
+      let(:finder) do
+        IssuesFinder.new(user, scope: 'all', label_name: Label::None.title,
+                         state: 'opened')
+      end
+
+      benchmark_subject { finder.execute }
+
+      it { is_expected.to iterate_per_second(2000) }
+    end
+
+    describe 'retrieving issues with labels' do
+      let(:finder) do
+        IssuesFinder.new(user, scope: 'all', label_name: label1.title,
+                         state: 'opened')
+      end
+
+      benchmark_subject { finder.execute }
+
+      it { is_expected.to iterate_per_second(1000) }
+    end
+
+    describe 'retrieving issues for a single project' do
+      let(:finder) do
+        IssuesFinder.new(user, scope: 'all', label_name: Label::None.title,
+                         state: 'opened', project_id: project.id)
+      end
+
+      benchmark_subject { finder.execute }
+
+      it { is_expected.to iterate_per_second(2000) }
+    end
+  end
+end