add some tests for the new feature

spec/features/issues/filter_by_labels.spec.rb

+require 'rails_helper'
+
+feature 'Issue filtering by Labels', feature: true do
+  let(:project) { create(:project, :public) }
+  let!(:user)   { create(:user)}
+  let!(:label)  { create(:label, project: project) }
+
+  before do
+    ['bug', 'feature', 'enhancement'].each do |title|
+      create(:label,
+             project: project,
+             title: title)
+    end
+
+    issue1 = create(:issue, title: "Bugfix1", project: project)
+    issue1.labels << project.labels.find_by(title: 'bug')
+
+    issue2 = create(:issue, title: "Bugfix2", project: project)
+    issue2.labels << project.labels.find_by(title: 'bug')
+    issue2.labels << project.labels.find_by(title: 'enhancement')
+
+    issue3 = create(:issue, title: "Feature1", project: project)
+    issue3.labels << project.labels.find_by(title: 'feature')
+
+    project.team << [user, :master]
+    login_as(user)
+
+    visit namespace_project_issues_path(project.namespace, project)
+  end
+
+  context 'filter by label bug', js: true do
+    before do
+      page.find('.js-label-select').click
+      sleep 0.5
+      execute_script("$('.dropdown-menu-labels li:contains(\"bug\") a').click()")
+      page.first('.labels-filter .dropdown-title .dropdown-menu-close-icon').click
+      sleep 2
+    end
+
+    it 'should show issue "Bugfix1" and "Bugfix2" in issues list' do
+      expect(page).to have_content "Bugfix1"
+      expect(page).to have_content "Bugfix2"
+    end
+
+    it 'should not show "Feature1" in issues list' do
+      expect(page).not_to have_content "Feature1"
+    end
+
+    it 'should show label "bug" in filtered-labels' do
+      expect(find('.filtered-labels')).to have_content "bug"
+    end
+
+    it 'should not show label "feature" and "enhancement" in filtered-labels' do
+      expect(find('.filtered-labels')).not_to have_content "feature"
+      expect(find('.filtered-labels')).not_to have_content "enhancement"
+    end
+  end
+
+  context 'filter by label feature', js: true do
+    before do
+      page.find('.js-label-select').click
+      sleep 0.5
+      execute_script("$('.dropdown-menu-labels li:contains(\"feature\") a').click()")
+      page.first('.labels-filter .dropdown-title .dropdown-menu-close-icon').click
+      sleep 2
+    end
+
+    it 'should show issue "Feature1" in issues list' do
+      expect(page).to have_content "Feature1"
+    end
+
+    it 'should not show "Bugfix1" and "Bugfix2" in issues list' do
+      expect(page).not_to have_content "Bugfix2"
+      expect(page).not_to have_content "Bugfix1"
+    end
+
+    it 'should show label "feature" in filtered-labels' do
+      expect(find('.filtered-labels')).to have_content "feature"
+    end
+
+    it 'should not show label "bug" and "enhancement" in filtered-labels' do
+      expect(find('.filtered-labels')).not_to have_content "bug"
+      expect(find('.filtered-labels')).not_to have_content "enhancement"
+    end
+  end
+
+  context 'filter by label enhancement', js: true do
+    before do
+      page.find('.js-label-select').click
+      sleep 0.5
+      execute_script("$('.dropdown-menu-labels li:contains(\"enhancement\") a').click()")
+      page.first('.labels-filter .dropdown-title .dropdown-menu-close-icon').click
+      sleep 2
+    end
+
+    it 'should show issue "Bugfix2" in issues list' do
+      expect(page).to have_content "Bugfix2"
+    end
+
+    it 'should not show "Feature1" and "Bugfix1" in issues list' do
+      expect(page).not_to have_content "Feature1"
+      expect(page).not_to have_content "Bugfix1"
+    end
+
+    it 'should show label "enhancement" in filtered-labels' do
+      expect(find('.filtered-labels')).to have_content "enhancement"
+    end
+
+    it 'should not show label "feature" and "bug" in filtered-labels' do
+      expect(find('.filtered-labels')).not_to have_content "bug"
+      expect(find('.filtered-labels')).not_to have_content "feature"
+    end
+  end
+
+  context 'filter by label enhancement or feature', js: true do
+    before do
+      page.find('.js-label-select').click
+      sleep 0.5
+      execute_script("$('.dropdown-menu-labels li:contains(\"enhancement\") a').click()")
+      execute_script("$('.dropdown-menu-labels li:contains(\"feature\") a').click()")
+      page.first('.labels-filter .dropdown-title .dropdown-menu-close-icon').click
+      sleep 2
+    end
+
+    it 'should show issue "Bugfix2" or "Feature1" in issues list' do
+      expect(page).to have_content "Bugfix2"
+      expect(page).to have_content "Feature1"
+    end
+
+    it 'should not show "Bugfix1" in issues list' do
+      expect(page).not_to have_content "Bugfix1"
+    end
+
+    it 'should show label "enhancement" and "feature" in filtered-labels' do
+      expect(find('.filtered-labels')).to have_content "enhancement"
+      expect(find('.filtered-labels')).to have_content "feature"
+    end
+
+    it 'should not show label "bug" in filtered-labels' do
+      expect(find('.filtered-labels')).not_to have_content "bug"
+    end
+  end
+
+  context 'filter by label enhancement or bug in issues list', js: true do
+    before do
+      page.find('.js-label-select').click
+      sleep 0.5
+      execute_script("$('.dropdown-menu-labels li:contains(\"enhancement\") a').click()")
+      execute_script("$('.dropdown-menu-labels li:contains(\"bug\") a').click()")
+      page.first('.labels-filter .dropdown-title .dropdown-menu-close-icon').click
+      sleep 2
+    end
+
+    it 'should show issue "Bugfix2" or "Bugfix1" in issues list' do
+      expect(page).to have_content "Bugfix2"
+      expect(page).to have_content "Bugfix1"
+    end
+
+    it 'should not show "Feature1"' do
+      expect(page).not_to have_content "Feature1"
+    end
+
+    it 'should show label "bug" and "enhancement" in filtered-labels' do
+      expect(find('.filtered-labels')).to have_content "bug"
+      expect(find('.filtered-labels')).to have_content "enhancement"
+    end
+
+    it 'should not show label "feature" in filtered-labels' do
+      expect(find('.filtered-labels')).not_to have_content "feature"
+    end
+  end
+end