Include EE modifications to clusterable files

- Deletes EE html specific view
- Overrides private methods on ClusterableActions
- Add ee specific specs

app/policies/concerns/clusterable_actions.rb

@@ -3,6 +3,7 @@
 module ClusterableActions
   private
 
+  # Overridden on EE module
   def multiple_clusters_available?
     false
   end

ee/app/policies/ee/clusterable_actions.rb

+# frozen_string_literal: true
+
+module EE
+  module ClusterableActions
+    extend ::Gitlab::Utils::Override
+
+    private
+
+    override :multiple_clusters_available?
+    def multiple_clusters_available?
+      subject.feature_available?(:multiple_clusters)
+    end
+  end
+end

ee/app/policies/ee/group_policy.rb

@@ -82,3 +82,5 @@ module EE
     end
   end
 end
+
+EE::GroupPolicy.include(EE::ClusterableActions)

ee/app/policies/ee/project_policy.rb

@@ -212,3 +212,5 @@ module EE
     end
   end
 end
+
+EE::ProjectPolicy.include(EE::ClusterableActions)

ee/app/views/clusters/clusters/_buttons.html.haml

-.nav-controls
-  - if clusterable.feature_available?(:multiple_clusters)
-    = link_to s_("ClusterIntegration|Add Kubernetes cluster"), clusterable.new_path, class: "btn btn-success btn-add-cluster has-tooltip js-add-cluster"
-  - else
-    %span.btn.btn-add-cluster.disabled.js-add-cluster
-      = s_("ClusterIntegration|Add Kubernetes cluster")

ee/spec/policies/group_policy_spec.rb

@@ -464,4 +464,15 @@ describe GroupPolicy do
       it { is_expected.to be_disallowed(:read_group_security_dashboard) }
     end
   end
+
+  it_behaves_like 'ee clusterable policies' do
+    let(:clusterable) { create(:group) }
+
+    let(:cluster) do
+      create(:cluster,
+             :provided_by_gcp,
+             :group,
+             groups: [clusterable])
+    end
+  end
 end

ee/spec/policies/project_policy_spec.rb

@@ -697,4 +697,15 @@ describe ProjectPolicy do
       it { is_expected.to be_disallowed(:create_web_ide_terminal) }
     end
   end
+
+  it_behaves_like 'ee clusterable policies' do
+    let(:clusterable) { create(:project, :repository) }
+
+    let(:cluster) do
+      create(:cluster,
+             :provided_by_gcp,
+             :project,
+             projects: [clusterable])
+    end
+  end
 end

ee/spec/support/shared_examples/clusterable_shared_examples.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+shared_examples 'ee clusterable policies' do
+  describe '#can_add_cluster?' do
+    let(:current_user) { create(:user) }
+
+    subject { described_class.new(current_user, clusterable) }
+
+    before do
+      clusterable.add_maintainer(current_user)
+    end
+
+    context 'when multiple_clusters feature is available' do
+      before do
+        stub_licensed_features(multiple_clusters: true)
+      end
+
+      context 'when clusterable has clusters' do
+        before do
+          cluster
+        end
+
+        it { is_expected.to be_allowed(:add_cluster) }
+      end
+
+      context 'when clusterable does not have clusters' do
+        it { is_expected.to be_allowed(:add_cluster) }
+      end
+    end
+
+    context 'when multiple_clusters feature is not available' do
+      before do
+        stub_licensed_features(multiple_clusters: false)
+      end
+
+      context 'when clusterable has clusters' do
+        before do
+          cluster
+        end
+
+        it { is_expected.to be_disallowed(:add_cluster) }
+      end
+
+      context 'when clusterable does not have clusters' do
+        it { is_expected.to be_allowed(:add_cluster) }
+      end
+    end
+  end
+end