Add group wiki controller

- Introduces `Groups::WikisController` and corresponding routes.
- Refactors shared examples for resource routing.
- Tweaks `Gitlab::UrlBuilder` to use the new routes.

app/controllers/concerns/wiki_actions.rb

@@ -2,6 +2,7 @@
 
 module WikiActions
   include DiffHelper
+  include PreviewMarkdown
   include SendsBlob
   include Gitlab::Utils::StrongMemoize
   extend ActiveSupport::Concern

app/controllers/projects/application_controller.rb

@@ -81,10 +81,6 @@ class Projects::ApplicationController < ApplicationController
     end
   end
 
-  def apply_diff_view_cookie!
-    set_secure_cookie(:diff_view, params.delete(:view), type: COOKIE_TYPE_PERMANENT) if params[:view].present?
-  end
-
   def require_pages_enabled!
     not_found unless @project.pages_available?
   end

app/controllers/projects/blob_controller.rb

@@ -9,6 +9,7 @@ class Projects::BlobController < Projects::ApplicationController
   include ActionView::Helpers::SanitizeHelper
   include RedirectsForMissingPathOnTree
   include SourcegraphDecorator
+  include DiffHelper
 
   prepend_before_action :authenticate_user!, only: [:edit]
 

app/controllers/projects/wikis_controller.rb

@@ -2,7 +2,6 @@
 
 class Projects::WikisController < Projects::ApplicationController
   include WikiActions
-  include PreviewMarkdown
 
   alias_method :container, :project
 

app/helpers/diff_helper.rb

@@ -174,6 +174,10 @@ module DiffHelper
     end
   end
 
+  def apply_diff_view_cookie!
+    set_secure_cookie(:diff_view, params.delete(:view), type: CookiesHelper::COOKIE_TYPE_PERMANENT) if params[:view].present?
+  end
+
   private
 
   def diff_btn(title, name, selected)

config/routes/wiki.rb

@@ -3,7 +3,7 @@ scope(controller: :wikis) do
     get :git_access
     get :pages
     get :new
-    get '/', to: redirect('%{namespace_id}/%{project_id}/wikis/home')
+    get '/', to: redirect { |params, request| "#{request.path}/home" }
     post '/', to: 'wikis#create'
   end
 

ee/app/assets/javascripts/pages/groups/wikis/index.js

+import initWikis from '~/pages/shared/wikis';
+
+document.addEventListener('DOMContentLoaded', initWikis);

ee/app/controllers/groups/wikis_controller.rb

+# frozen_string_literal: true
+
+class Groups::WikisController < Groups::ApplicationController
+  include WikiActions
+
+  alias_method :container, :group
+
+  private
+
+  def authorize_read_wiki!
+    access_denied! unless can?(current_user, :read_wiki, group)
+  end
+
+  def authorize_create_wiki!
+    access_denied! unless can?(current_user, :create_wiki, group)
+  end
+
+  def authorize_admin_wiki!
+    access_denied! unless can?(current_user, :admin_wiki, group)
+  end
+end

ee/config/routes/group.rb

@@ -13,6 +13,8 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
         module: :groups,
         as: :group,
         constraints: { group_id: Gitlab::PathRegex.full_namespace_route_regex }) do
+    draw :wiki
+
     resources :group_members, only: [], concerns: :access_requestable do
       patch :override, on: :member
     end

ee/lib/ee/gitlab/url_builder.rb

@@ -35,15 +35,14 @@ module EE
           end
         end
 
-        override :wiki_page_url
-        def wiki_page_url(wiki, page, **options)
+        override :wiki_url
+        def wiki_url(wiki, **options)
           if wiki.container.is_a?(Group)
-            # TODO: Use the new route for group wikis once we add it.
-            # https://gitlab.com/gitlab-org/gitlab/-/issues/211360
-            instance.group_canonical_url(wiki.container, **options) + "/-/wikis/#{page.to_param}"
-          else
-            super
+            options[:controller] = 'groups/wikis'
+            options[:group_id] = wiki.container
           end
+
+          super
         end
       end
     end

ee/spec/controllers/groups/wikis_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::WikisController do
+  it_behaves_like 'wiki controller actions' do
+    let(:container) { create(:group, :public) }
+    let(:routing_params) { { group_id: container } }
+
+    before do
+      container.add_owner(user)
+      stub_feature_flags(group_wiki: container)
+    end
+
+    context 'when the feature flag is disabled' do
+      before do
+        stub_feature_flags(group_wiki: false)
+      end
+
+      using RSpec::Parameterized::TableSyntax
+
+      where(:method, :action) do
+        :get    | :new
+        :get    | :pages
+        :post   | :create
+        :get    | :show
+        :get    | :edit
+        :get    | :history
+        :post   | :preview_markdown
+        :put    | :update
+        :delete | :destroy
+      end
+
+      with_them do
+        it 'returns a 404 error' do
+          process action, method: method, params: routing_params.merge(id: 'page')
+
+          expect(response).to have_gitlab_http_status(:not_found)
+        end
+      end
+    end
+  end
+end

ee/spec/routing/group_routing_spec.rb

@@ -5,6 +5,10 @@ require 'spec_helper'
 RSpec.describe 'Group routing', "routing" do
   include RSpec::Rails::RoutingExampleGroup
 
+  before do
+    allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
+  end
+
   describe 'subgroup "boards"' do
     it 'shows group show page' do
       allow(Group).to receive(:find_by_full_path).with('gitlabhq/boards', any_args).and_return(true)
@@ -13,43 +17,29 @@ RSpec.describe 'Group routing', "routing" do
     end
 
     it 'shows boards index page' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/boards')).to route_to('groups/boards#index', group_id: 'gitlabhq')
     end
   end
 
   describe 'security' do
     it 'shows group dashboard' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/security/dashboard')).to route_to('groups/security/dashboard#show', group_id: 'gitlabhq')
     end
 
     it 'lists vulnerabilities' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/security/vulnerability_findings')).to route_to('groups/security/vulnerability_findings#index', group_id: 'gitlabhq')
     end
 
     it 'shows vulnerability summary' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/security/vulnerability_findings/summary')).to route_to('groups/security/vulnerability_findings#summary', group_id: 'gitlabhq')
     end
 
     it 'shows vulnerability history' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/security/vulnerability_findings/history')).to route_to('groups/security/vulnerability_findings#history', group_id: 'gitlabhq')
     end
   end
 
   describe 'dependency proxy for containers' do
-    before do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-    end
-
     context 'image name without namespace' do
       it 'routes to #manifest' do
         expect(get('/v2/gitlabhq/dependency_proxy/containers/ruby/manifests/2.3.6'))
@@ -87,41 +77,48 @@ RSpec.describe 'Group routing', "routing" do
 
   describe 'hooks' do
     it 'routes to hooks edit page' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/hooks/2/edit')).to route_to('groups/hooks#edit', group_id: 'gitlabhq', id: '2')
     end
   end
 
   describe 'packages' do
     it 'routes to packages index page' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(get('/groups/gitlabhq/-/packages')).to route_to('groups/packages#index', group_id: 'gitlabhq')
     end
   end
 
   describe 'issues' do
     it 'routes post to #bulk_update' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(post('/groups/gitlabhq/-/issues/bulk_update')).to route_to('groups/issues#bulk_update', group_id: 'gitlabhq')
     end
   end
 
   describe 'merge_requests' do
     it 'routes post to #bulk_update' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(post('/groups/gitlabhq/-/merge_requests/bulk_update')).to route_to('groups/merge_requests#bulk_update', group_id: 'gitlabhq')
     end
   end
 
   describe 'epics' do
     it 'routes post to #bulk_update' do
-      allow(Group).to receive(:find_by_full_path).with('gitlabhq', any_args).and_return(true)
-
       expect(post('/groups/gitlabhq/-/epics/bulk_update')).to route_to('groups/epics#bulk_update', group_id: 'gitlabhq')
     end
   end
+
+  #      group_wikis_git_access GET    /:group_id/-/wikis/git_access(.:format) groups/wikis#git_access
+  #           group_wikis_pages GET    /:group_id/-/wikis/pages(.:format)      groups/wikis#pages
+  #             group_wikis_new GET    /:group_id/-/wikis/new(.:format)        groups/wikis#new
+  #                             POST   /:group_id/-/wikis(.:format)            groups/wikis#create
+  #             group_wiki_edit GET    /:group_id/-/wikis/*id/edit             groups/wikis#edit
+  #          group_wiki_history GET    /:group_id/-/wikis/*id/history          groups/wikis#history
+  # group_wiki_preview_markdown POST   /:group_id/-/wikis/*id/preview_markdown groups/wikis#preview_markdown
+  #                  group_wiki GET    /:group_id/-/wikis/*id                  groups/wikis#show
+  #                             PUT    /:group_id/-/wikis/*id                  groups/wikis#update
+  #                             DELETE /:group_id/-/wikis/*id                  groups/wikis#destroy
+  describe Groups::WikisController, 'routing' do
+    it_behaves_like 'wiki routing' do
+      let(:base_path) { '/groups/gitlabhq/-/wikis' }
+      let(:base_params) { { group_id: 'gitlabhq' } }
+    end
+  end
 end

lib/gitlab/url_builder.rb

@@ -85,9 +85,11 @@ module Gitlab
       def wiki_url(wiki, **options)
         return wiki_page_url(wiki, Wiki::HOMEPAGE, **options) unless options[:action]
 
-        options[:controller] = 'projects/wikis'
-        options[:namespace_id] = wiki.container.namespace
-        options[:project_id] = wiki.container
+        if wiki.container.is_a?(Project)
+          options[:controller] = 'projects/wikis'
+          options[:namespace_id] = wiki.container.namespace
+          options[:project_id] = wiki.container
+        end
 
         instance.url_for(**options)
       end

spec/controllers/projects/wikis_controller_spec.rb

@@ -4,7 +4,7 @@ require 'spec_helper'
 
 RSpec.describe Projects::WikisController do
   it_behaves_like 'wiki controller actions' do
-    let(:container) { create(:project, :public, :repository, namespace: user.namespace) }
+    let(:container) { create(:project, :public, namespace: user.namespace) }
     let(:routing_params) { { namespace_id: container.namespace, project_id: container } }
   end
 end

spec/routing/project_routing_spec.rb

@@ -3,71 +3,13 @@
 require 'spec_helper'
 
 RSpec.describe 'project routing' do
+  let(:base_params) { { namespace_id: 'gitlab', project_id: 'gitlabhq' } }
+
   before do
     allow(Project).to receive(:find_by_full_path).and_return(false)
     allow(Project).to receive(:find_by_full_path).with('gitlab/gitlabhq', any_args).and_return(true)
   end
 
-  # Shared examples for a resource inside a Project
-  #
-  # By default it tests all the default REST actions: index, create, new, edit,
-  # show, update, and destroy. You can remove actions by customizing the
-  # `actions` variable.
-  #
-  # It also expects a `controller` variable to be available which defines both
-  # the path to the resource as well as the controller name.
-  #
-  # Examples
-  #
-  #   # Default behavior
-  #   it_behaves_like 'RESTful project resources' do
-  #     let(:controller) { 'issues' }
-  #   end
-  #
-  #   # Customizing actions
-  #   it_behaves_like 'RESTful project resources' do
-  #     let(:actions)    { [:index] }
-  #     let(:controller) { 'issues' }
-  #   end
-  #
-  #   # Different controller name and path
-  #   it_behaves_like 'RESTful project resources' do
-  #     let(:controller) { 'pages_domains' }
-  #     let(:controller_path) { 'pages/domains' }
-  #   end
-  shared_examples 'RESTful project resources' do
-    let(:actions) { [:index, :create, :new, :edit, :show, :update, :destroy] }
-    let(:controller_path) { controller }
-
-    it 'to #index' do
-      expect(get("/gitlab/gitlabhq/#{controller_path}")).to route_to("projects/#{controller}#index", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:index)
-    end
-
-    it 'to #create' do
-      expect(post("/gitlab/gitlabhq/#{controller_path}")).to route_to("projects/#{controller}#create", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:create)
-    end
-
-    it 'to #new' do
-      expect(get("/gitlab/gitlabhq/#{controller_path}/new")).to route_to("projects/#{controller}#new", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:new)
-    end
-
-    it 'to #edit' do
-      expect(get("/gitlab/gitlabhq/#{controller_path}/1/edit")).to route_to("projects/#{controller}#edit", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:edit)
-    end
-
-    it 'to #show' do
-      expect(get("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#show", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:show)
-    end
-
-    it 'to #update' do
-      expect(put("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#update", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:update)
-    end
-
-    it 'to #destroy' do
-      expect(delete("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#destroy", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:destroy)
-    end
-  end
-
   #                 projects POST   /projects(.:format)     projects#create
   #              new_project GET    /projects/new(.:format) projects#new
   #            files_project GET    /:id/files(.:format)    projects#files
@@ -149,25 +91,19 @@ RSpec.describe 'project routing' do
     end
   end
 
-  #  pages_project_wikis GET    /:project_id/wikis/pages(.:format)       projects/wikis#pages
-  # history_project_wiki GET    /:project_id/wikis/:id/history(.:format) projects/wikis#history
-  #        project_wikis POST   /:project_id/wikis(.:format)             projects/wikis#create
-  #    edit_project_wiki GET    /:project_id/wikis/:id/edit(.:format)    projects/wikis#edit
-  #         project_wiki GET    /:project_id/wikis/:id(.:format)         projects/wikis#show
-  #                      DELETE /:project_id/wikis/:id(.:format)         projects/wikis#destroy
+  #      project_wikis_git_access GET    /:project_id/-/wikis/git_access(.:format) projects/wikis#git_access
+  #           project_wikis_pages GET    /:project_id/-/wikis/pages(.:format)      projects/wikis#pages
+  #             project_wikis_new GET    /:project_id/-/wikis/new(.:format)        projects/wikis#new
+  #                               POST   /:project_id/-/wikis(.:format)            projects/wikis#create
+  #             project_wiki_edit GET    /:project_id/-/wikis/*id/edit             projects/wikis#edit
+  #          project_wiki_history GET    /:project_id/-/wikis/*id/history          projects/wikis#history
+  # project_wiki_preview_markdown POST   /:project_id/-/wikis/*id/preview_markdown projects/wikis#preview_markdown
+  #                  project_wiki GET    /:project_id/-/wikis/*id                  projects/wikis#show
+  #                               PUT    /:project_id/-/wikis/*id                  projects/wikis#update
+  #                               DELETE /:project_id/-/wikis/*id                  projects/wikis#destroy
   describe Projects::WikisController, 'routing' do
-    it 'to #pages' do
-      expect(get('/gitlab/gitlabhq/-/wikis/pages')).to route_to('projects/wikis#pages', namespace_id: 'gitlab', project_id: 'gitlabhq')
-    end
-
-    it 'to #history' do
-      expect(get('/gitlab/gitlabhq/-/wikis/1/history')).to route_to('projects/wikis#history', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
-    end
-
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:create, :edit, :show, :destroy] }
-      let(:controller) { 'wikis' }
-      let(:controller_path) { '/-/wikis' }
+    it_behaves_like 'wiki routing' do
+      let(:base_path) { '/gitlab/gitlabhq/-/wikis' }
     end
 
     it_behaves_like 'redirecting a legacy project path', "/gitlab/gitlabhq/wikis", "/gitlab/gitlabhq/-/wikis"
@@ -246,10 +182,9 @@ RSpec.describe 'project routing' do
   #      project_deploy_key PATCH  /:project_id/deploy_keys/:id(.:format)      deploy_keys#update
   #                         DELETE /:project_id/deploy_keys/:id(.:format)      deploy_keys#destroy
   describe Projects::DeployKeysController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:index, :new, :create, :edit, :update] }
-      let(:controller) { 'deploy_keys' }
-      let(:controller_path) { '/-/deploy_keys' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index new create edit update] }
+      let(:base_path) { '/gitlab/gitlabhq/-/deploy_keys' }
     end
   end
 
@@ -257,10 +192,9 @@ RSpec.describe 'project routing' do
   #                            POST   /:project_id/protected_branches(.:format)     protected_branches#create
   #   project_protected_branch DELETE /:project_id/protected_branches/:id(.:format) protected_branches#destroy
   describe Projects::ProtectedBranchesController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:index, :create, :destroy] }
-      let(:controller) { 'protected_branches' }
-      let(:controller_path) { '/-/protected_branches' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index create destroy] }
+      let(:base_path) { '/gitlab/gitlabhq/-/protected_branches' }
     end
   end
 
@@ -320,10 +254,9 @@ RSpec.describe 'project routing' do
       expect(get('/gitlab/gitlabhq/-/merge_requests/1/diffs')).to route_to('projects/merge_requests#show', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1', tab: 'diffs')
     end
 
-    it_behaves_like 'RESTful project resources' do
-      let(:controller) { 'merge_requests' }
-      let(:actions) { [:index, :edit, :show, :update] }
-      let(:controller_path) { '/-/merge_requests' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index edit show update] }
+      let(:base_path) { '/gitlab/gitlabhq/-/merge_requests' }
     end
 
     it_behaves_like 'redirecting a legacy project path', "/gitlab/gitlabhq/merge_requests", "/gitlab/gitlabhq/-/merge_requests"
@@ -428,9 +361,9 @@ RSpec.describe 'project routing' do
       expect(post('/gitlab/gitlabhq/hooks/1/test')).to route_to('projects/hooks#test', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
     end
 
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:index, :create, :destroy, :edit, :update] }
-      let(:controller) { 'hooks' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index create destroy edit update] }
+      let(:base_path) { '/gitlab/gitlabhq/hooks' }
     end
   end
 
@@ -465,10 +398,9 @@ RSpec.describe 'project routing' do
   #                         POST   /:project_id/commits(.:format)           commits#create
   #          project_commit GET    /:project_id/commits/:id(.:format)       commits#show
   describe Projects::CommitsController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:show] }
-      let(:controller) { 'commits' }
-      let(:controller_path) { '/-/commits' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[show] }
+      let(:base_path) { '/gitlab/gitlabhq/-/commits' }
     end
 
     it 'to #show' do
@@ -485,10 +417,9 @@ RSpec.describe 'project routing' do
   #                          PUT    /:project_id/project_members/:id(.:format)      project_members#update
   #                          DELETE /:project_id/project_members/:id(.:format)      project_members#destroy
   describe Projects::ProjectMembersController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:index, :create, :update, :destroy] }
-      let(:controller) { 'project_members' }
-      let(:controller_path) { '/-/project_members' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index create update destroy] }
+      let(:base_path) { '/gitlab/gitlabhq/-/project_members' }
     end
   end
 
@@ -501,10 +432,9 @@ RSpec.describe 'project routing' do
   #                           DELETE /:project_id/milestones/:id(.:format)      milestones#destroy
   # promote_project_milestone POST /:project_id/milestones/:id/promote          milestones#promote
   describe Projects::MilestonesController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:controller) { 'milestones' }
-      let(:actions) { [:index, :create, :new, :edit, :show, :update] }
-      let(:controller_path) { '/-/milestones' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index create new edit show update] }
+      let(:base_path) { '/gitlab/gitlabhq/-/milestones' }
     end
 
     it 'to #promote' do
@@ -534,10 +464,9 @@ RSpec.describe 'project routing' do
       expect(post('/gitlab/gitlabhq/-/issues/bulk_update')).to route_to('projects/issues#bulk_update', namespace_id: 'gitlab', project_id: 'gitlabhq')
     end
 
-    it_behaves_like 'RESTful project resources' do
-      let(:controller) { 'issues' }
-      let(:actions) { [:index, :create, :new, :edit, :show, :update] }
-      let(:controller_path) { '/-/issues' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[index create new edit show update] }
+      let(:base_path) { '/gitlab/gitlabhq/-/issues' }
     end
 
     it_behaves_like 'redirecting a legacy project path', "/gitlab/gitlabhq/issues", "/gitlab/gitlabhq/-/issues"
@@ -558,9 +487,9 @@ RSpec.describe 'project routing' do
       )
     end
 
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:create, :destroy] }
-      let(:controller) { 'notes' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[create destroy] }
+      let(:base_path) { '/gitlab/gitlabhq/notes' }
     end
   end
 
@@ -749,10 +678,10 @@ RSpec.describe 'project routing' do
   end
 
   describe Projects::PagesDomainsController, 'routing' do
-    it_behaves_like 'RESTful project resources' do
-      let(:actions)    { [:show, :new, :create, :destroy] }
-      let(:controller) { 'pages_domains' }
-      let(:controller_path) { 'pages/domains' }
+    it_behaves_like 'resource routing' do
+      let(:actions) { %i[show new create destroy] }
+      let(:base_path) { '/gitlab/gitlabhq/pages/domains' }
+      let(:id) { 'my.domain.com' }
     end
 
     it 'to #destroy with a valid domain name' do

spec/support/shared_examples/controllers/wiki_actions_shared_examples.rb

@@ -147,6 +147,7 @@ RSpec.shared_examples 'wiki controller actions' do
         subject
 
         expect(response).to have_gitlab_http_status(:ok)
+        expect(response).to render_template('shared/wikis/show')
         expect(assigns(:page).title).to eq(wiki_title)
         expect(assigns(:sidebar_wiki_entries)).to contain_exactly(an_instance_of(WikiPage))
         expect(assigns(:sidebar_limited)).to be(false)
@@ -159,6 +160,7 @@ RSpec.shared_examples 'wiki controller actions' do
           subject
 
           expect(response).to have_gitlab_http_status(:ok)
+          expect(response).to render_template('shared/wikis/show')
           expect(flash[:notice]).to eq(_('The content of this page is not encoded in UTF-8. Edits can only be made via the Git repository.'))
         end
       end
@@ -167,19 +169,37 @@ RSpec.shared_examples 'wiki controller actions' do
     context 'when the page does not exist' do
       let(:id) { 'does not exist' }
 
-      before do
-        subject
-      end
+      context 'when the user can create pages' do
+        before do
+          subject
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response).to render_template('shared/wikis/edit')
+        end
+
+        it 'builds a new wiki page with the id as the title' do
+          expect(assigns(:page).title).to eq(id)
+        end
+
+        context 'when a random_title param is present' do
+          let(:random_title) { true }
 
-      it 'builds a new wiki page with the id as the title' do
-        expect(assigns(:page).title).to eq(id)
+          it 'builds a new wiki page with no title' do
+            expect(assigns(:page).title).to be_empty
+          end
+        end
       end
 
-      context 'when a random_title param is present' do
-        let(:random_title) { true }
+      context 'when the user cannot create pages' do
+        before do
+          sign_out(:user)
+        end
+
+        it 'shows the empty state' do
+          subject
 
-        it 'builds a new wiki page with no title' do
-          expect(assigns(:page).title).to be_empty
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response).to render_template('shared/wikis/empty')
         end
       end
     end
@@ -195,6 +215,7 @@ RSpec.shared_examples 'wiki controller actions' do
         it 'delivers the file with the correct headers' do
           subject
 
+          expect(response).to have_gitlab_http_status(:ok)
           expect(response.headers['Content-Disposition']).to match(/^inline/)
           expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq('true')
           expect(response.cache_control[:public]).to be(false)
@@ -208,6 +229,7 @@ RSpec.shared_examples 'wiki controller actions' do
     it 'renders json in a correct format' do
       post :preview_markdown, params: routing_params.merge(id: 'page/path', text: '*Markdown* text')
 
+      expect(response).to have_gitlab_http_status(:ok)
       expect(json_response.keys).to match_array(%w(body references))
     end
   end

spec/support/shared_examples/routing/resource_routing_shared_examples.rb

+# frozen_string_literal: true
+
+# Shared examples for resource routes.
+#
+# By default it tests all the default REST actions: index, create, new, edit,
+# show, update, and destroy. You can remove actions by customizing the
+# `actions` variable.
+#
+# The subject is expected to be an instance of the controller under test.
+#
+# It also expects a `base_path` variable to be available which defines the
+# base path of the controller, and a `base_params` variable which
+# defines the route params the base path maps to.
+#
+# Examples
+#
+#   # Default behavior
+#   describe Projects::CommitsController, 'routing' do
+#     it_behaves_like 'resource routing' do
+#       let(:base_path) { '/gitlab/gitlabhq/-/commits' }
+#       let(:base_params) { { namespace_id: 'gitlab', project_id: 'gitlabhq' } }
+#     end
+#   end
+#
+#   # Customizing actions
+#   it_behaves_like 'resource routing' do
+#     let(:base_path) { '/gitlab/gitlabhq/-/commits' }
+#
+#     # Specify default actions
+#     let(:actions) { [:index] }
+#
+#     # Add custom actions by passing a hash with action names
+#     # as keys, and the HTTP method and path as values.
+#     let(:additional_actions) do
+#       {
+#         preview_markdown: [:post, '/:id/preview_markdown'],
+#       }
+#     end
+#   end
+RSpec.shared_examples 'resource routing' do
+  let(:controller) { described_class.controller_path }
+  let(:id) { '123' }
+
+  let(:default_actions) do
+    {
+      index:   [:get, ''],
+      show:    [:get, '/:id'],
+      new:     [:get, '/new'],
+      create:  [:post, ''],
+      edit:    [:get, '/:id/edit'],
+      update:  [:put, '/:id'],
+      destroy: [:delete, '/:id']
+    }
+  end
+
+  let(:actions) { default_actions.keys }
+  let(:additional_actions) { {} }
+
+  it 'routes resource actions', :aggregate_failures do
+    selected_actions = default_actions.slice(*actions).merge(additional_actions)
+
+    selected_actions.each do |action, (method, action_path)|
+      expected_params = base_params.merge(controller: controller.to_s, action: action.to_s)
+
+      if action_path.include?(':id')
+        action_path = action_path.sub(':id', id)
+        expected_params[:id] = id
+      end
+
+      expect(public_send(method, "#{base_path}#{action_path}")).to route_to(expected_params)
+    end
+  end
+end

spec/support/shared_examples/routing/wiki_routing_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'wiki routing' do
+  it_behaves_like 'resource routing' do
+    let(:id) { 'directory/page' }
+    let(:actions) { %i[show new create edit update destroy] }
+    let(:additional_actions) do
+      {
+        pages:            [:get, '/pages'],
+        history:          [:get, '/:id/history'],
+        git_access:       [:get, '/git_access'],
+        preview_markdown: [:post, '/:id/preview_markdown']
+      }
+    end
+  end
+
+  it 'redirects the base path to the home page', type: :request do
+    expect(get(base_path)).to redirect_to("#{base_path}/home")
+  end
+end