Add boilerplate for iteration cadences form

ee/app/assets/javascripts/iterations/components/iteration_cadence_form.vue

+<template>
+  <div></div>
+</template>

ee/app/assets/javascripts/iterations/index.js

@@ -2,6 +2,7 @@ import Vue from 'vue';
 import VueApollo from 'vue-apollo';
 import createDefaultClient from '~/lib/graphql';
 import { parseBoolean } from '~/lib/utils/common_utils';
+import IterationCadenceForm from './components/iteration_cadence_form.vue';
 import IterationForm from './components/iteration_form.vue';
 import IterationReport from './components/iteration_report.vue';
 import Iterations from './components/iterations.vue';
@@ -89,3 +90,27 @@ export function initIterationReport({ namespaceType, initiallyEditing } = {}) {
     },
   });
 }
+
+export function initCadenceForm() {
+  const el = document.querySelector('.js-iteration-cadence-form');
+
+  if (!el) {
+    return null;
+  }
+
+  const { groupFullPath: groupPath, cadenceId, cadenceListPath } = el;
+
+  return new Vue({
+    el,
+    apolloProvider,
+    render(createElement) {
+      return createElement(IterationCadenceForm, {
+        props: {
+          groupPath,
+          cadenceId,
+          cadenceListPath,
+        },
+      });
+    },
+  });
+}

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

+import { initCadenceForm } from 'ee/iterations';
+
+initCadenceForm();

ee/app/controllers/groups/iteration_cadences_controller.rb

+# frozen_string_literal: true
+
+class Groups::IterationCadencesController < Groups::ApplicationController
+  before_action :check_cadences_available!
+  before_action :authorize_show_cadence!, only: [:index]
+  before_action :authorize_admin_cadence!, only: [:edit]
+  before_action :authorize_create_cadence!, only: [:new]
+
+  feature_category :issue_tracking
+
+  def new; end
+
+  def edit; end
+
+  def index; end
+
+  private
+
+  def check_cadences_available!
+    render_404 unless group.iteration_cadences_feature_flag_enabled?
+  end
+
+  def authorize_admin_cadence!
+    render_404 unless can?(current_user, :admin_iteration_cadence, group)
+  end
+
+  def authorize_create_cadence!
+    render_404 unless can?(current_user, :create_iteration_cadence, group)
+  end
+
+  def authorize_show_cadence!
+    render_404 unless can?(current_user, :read_iteration_cadence, group)
+  end
+end

ee/app/views/groups/iteration_cadences/edit.html.haml

+- add_to_breadcrumbs _("Iteration cadences"), group_iteration_cadences_path(@group)
+- breadcrumb_title params[:id]
+- page_title _("Edit iteration cadence")
+
+.js-iteration-cadence-form{ data: { group_full_path: @group.full_path,
+  cadence_id: params[:id],
+  cadences_list_path: group_iteration_cadences_path(@group) } }

ee/app/views/groups/iteration_cadences/new.html.haml

+- add_to_breadcrumbs _("Iteration cadences"), group_iteration_cadences_path(@group)
+- breadcrumb_title _("New")
+- page_title _("New iteration cadence")
+
+.js-iteration-cadence-form{ data: { group_full_path: @group.full_path, cadences_list_path: group_iteration_cadences_path(@group) } }

ee/config/routes/group.rb

@@ -124,6 +124,8 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
 
     resources :iterations, only: [:index, :new, :edit, :show], constraints: { id: /\d+/ }
 
+    resources :iteration_cadences, only: [:index, :new, :edit], path: 'cadences', constraints: { id: /\d+/ }
+
     resources :issues, only: [] do
       collection do
         post :bulk_update

ee/spec/controllers/groups/iteration_cadences_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::IterationCadencesController do
+  using RSpec::Parameterized::TableSyntax
+
+  let_it_be(:group) { create(:group, :private) }
+  let_it_be(:cadence) { create(:iterations_cadence, group: group) }
+  let_it_be(:user) { create(:user) }
+
+  before do
+    stub_feature_flags(iteration_cadences: feature_flag_available)
+    group.add_user(user, role) unless role == :none
+    sign_in(user)
+  end
+
+  describe 'new' do
+    subject { get :new, params: { group_id: group } }
+
+    where(:feature_flag_available, :role, :status) do
+      false | :developer | :not_found
+      true  | :none      | :not_found
+      true  | :guest     | :not_found
+      true  | :developer | :success
+    end
+
+    with_them do
+      it_behaves_like 'returning response status', params[:status]
+    end
+  end
+
+  describe 'edit' do
+    subject { get :edit, params: { group_id: group, id: cadence } }
+
+    where(:feature_flag_available, :role, :status) do
+      false | :developer | :not_found
+      true  | :none      | :not_found
+      true  | :guest     | :not_found
+      true  | :developer | :success
+    end
+
+    with_them do
+      it_behaves_like 'returning response status', params[:status]
+    end
+  end
+end

locale/gitlab.pot

@@ -11636,6 +11636,9 @@ msgstr ""
 msgid "Edit iteration"
 msgstr ""
 
+msgid "Edit iteration cadence"
+msgstr ""
+
 msgid "Edit public deploy key"
 msgstr ""
 
@@ -17842,6 +17845,9 @@ msgstr ""
 msgid "Iteration"
 msgstr ""
 
+msgid "Iteration cadences"
+msgstr ""
+
 msgid "Iteration changed to"
 msgstr ""
 
@@ -21226,6 +21232,9 @@ msgstr ""
 msgid "New iteration"
 msgstr ""
 
+msgid "New iteration cadence"
+msgstr ""
+
 msgid "New iteration created"
 msgstr ""