EE: Add API for CRUD group clusters

This is basically a copy of the API for project clusters.

ee/lib/ee/api/group_clusters.rb

+# frozen_string_literal: true
+
+module EE
+  module API
+    module GroupClusters
+      extend ActiveSupport::Concern
+
+      prepended do
+        helpers do
+          params :create_params_ee do
+            optional :environment_scope, default: '*', type: String, desc: 'The associated environment to the cluster'
+          end
+
+          params :update_params_ee do
+            optional :environment_scope, type: String, desc: 'The associated environment to the cluster'
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/requests/api/group_clusters_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::GroupClusters do
+  include KubernetesHelpers
+
+  let(:current_user) { create(:user) }
+  let(:group) { create(:group) }
+
+  before do
+    group.add_maintainer(current_user)
+  end
+
+  describe 'POST /groups/:id/clusters/user' do
+    let(:api_url) { 'https://kubernetes.example.com' }
+
+    let(:platform_kubernetes_attributes) do
+      {
+        api_url: api_url,
+        token: 'sample-token'
+      }
+    end
+
+    let(:cluster_params) do
+      {
+        name: 'test-cluster',
+        environment_scope: 'production/*',
+        platform_kubernetes_attributes: platform_kubernetes_attributes
+      }
+    end
+
+    context 'when user sets specific environment scope' do
+      it 'creates a cluster with that specific environment' do
+        post api("/groups/#{group.id}/clusters/user", current_user), params: cluster_params
+
+        expect(json_response['environment_scope']).to eq('production/*')
+      end
+    end
+
+    context 'when does not set an specific environment scope' do
+      let(:cluster_params) do
+        {
+          name: 'test-cluster',
+          platform_kubernetes_attributes: platform_kubernetes_attributes
+        }
+      end
+
+      it 'sets default environment' do
+        post api("/groups/#{group.id}/clusters/user", current_user), params: cluster_params
+
+        expect(json_response['environment_scope']).to eq('*')
+      end
+    end
+
+    context 'when license has multiple clusters feature' do
+      before do
+        stub_licensed_features(multiple_clusters: true)
+
+        create(:cluster, :provided_by_gcp, :group,
+               groups: [group])
+
+        post api("/groups/#{group.id}/clusters/user", current_user), params: cluster_params
+      end
+
+      it 'responds with 201' do
+        expect(response).to have_gitlab_http_status(201)
+      end
+
+      it 'allows multiple clusters to be associated to group' do
+        expect(group.reload.clusters.count).to eq(2)
+      end
+    end
+  end
+
+  describe 'PUT /groups/:id/clusters/:cluster_id' do
+    let(:api_url) { 'https://kubernetes.example.com' }
+
+    let(:update_params) do
+      {
+        environment_scope: 'test/*'
+      }
+    end
+
+    before do
+      put api("/groups/#{group.id}/clusters/#{cluster.id}", current_user), params: update_params
+
+      cluster.reload
+    end
+
+    context 'With a GCP cluster' do
+      let(:cluster) do
+        create(:cluster, :group, :provided_by_gcp,
+               groups: [group])
+      end
+
+      it 'updates the environment scope' do
+        expect(cluster.environment_scope).to eq('test/*')
+      end
+    end
+
+    context 'With an user cluster' do
+      let(:cluster) do
+        create(:cluster, :group, :provided_by_user,
+               groups: [group])
+      end
+
+      it 'updates the environment scope' do
+        expect(cluster.environment_scope).to eq('test/*')
+      end
+    end
+  end
+end

lib/api/group_clusters.rb

@@ -16,6 +16,8 @@ module API
       end
     end
 
+    prepend EE::API::GroupClusters # rubocop: disable Cop/InjectEnterpriseEditionModule
+
     params do
       requires :id, type: String, desc: 'The ID of the group'
     end