Introduce new enabled option for CodeHarbor

* Fix tests to ensure they work independent of config option

spec/policies/codeharbor_link_policy_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 describe CodeharborLinkPolicy do
@@ -5,37 +7,73 @@ describe CodeharborLinkPolicy do
 
   let(:codeharbor_link) { FactoryBot.create(:codeharbor_link) }
 
-  %i[index? show?].each do |action|
-    permissions(action) do
-      it 'does not grant access any user' do
-        %i[external_user teacher admin].each do |factory_name|
-          expect(policy).not_to permit(FactoryBot.create(factory_name), codeharbor_link)
+  context 'when CodeHarbor link is enabled' do
+    let(:codeocean_config) { instance_double(CodeOcean::Config) }
+    let(:codeharbor_config) { {codeharbor: {enabled: true}} }
+
+    before do
+      allow(CodeOcean::Config).to receive(:new).with(:code_ocean).and_return(codeocean_config)
+      allow(codeocean_config).to receive(:read).and_return(codeharbor_config)
+    end
+
+    %i[index? show?].each do |action|
+      permissions(action) do
+        it 'does not grant access any user' do
+          %i[external_user teacher admin].each do |factory_name|
+            expect(policy).not_to permit(FactoryBot.create(factory_name), codeharbor_link)
+          end
         end
       end
     end
-  end
 
-  %i[new? create?].each do |action|
-    permissions(action) do
-      it 'grants access to teachers' do
-        %i[teacher admin].each do |factory_name|
+    %i[new? create?].each do |action|
+      permissions(action) do
+        it 'grants access to teachers' do
+          %i[teacher admin].each do |factory_name|
+            expect(policy).to permit(FactoryBot.create(factory_name), codeharbor_link)
+          end
+        end
+
+        it 'does not grant access to all other users' do
+          expect(policy).not_to permit(FactoryBot.create(:external_user), codeharbor_link)
+        end
+      end
+    end
+
+    %i[destroy? edit? update?].each do |action|
+      permissions(action) do
+        it 'grants access to the owner of the link' do
+          expect(policy).to permit(codeharbor_link.user, codeharbor_link)
+        end
+
+        it 'does not grant access to arbitrary users' do
+          %i[external_user admin teacher].each do |factory_name|
+            expect(policy).not_to permit(FactoryBot.create(factory_name), codeharbor_link)
+          end
+        end
+      end
+    end
+
+    permissions(:enabled?) do
+      it 'reflects the config option' do
+        %i[external_user admin teacher].each do |factory_name|
           expect(policy).to permit(FactoryBot.create(factory_name), codeharbor_link)
         end
       end
-
-      it 'does not grant access to all other users' do
-        expect(policy).not_to permit(FactoryBot.create(:external_user), codeharbor_link)
-      end
     end
   end
 
-  %i[destroy? edit? update?].each do |action|
-    permissions(action) do
-      it 'grants access to the owner of the link' do
-        expect(policy).to permit(codeharbor_link.user, codeharbor_link)
-      end
+  context 'when CodeHabor link is disabled' do
+    let(:codeocean_config) { instance_double(CodeOcean::Config) }
+    let(:codeharbor_config) { {codeharbor: {enabled: false}} }
 
-      it 'does not grant access to arbitrary users' do
+    before do
+      allow(CodeOcean::Config).to receive(:new).with(:code_ocean).and_return(codeocean_config)
+      allow(codeocean_config).to receive(:read).and_return(codeharbor_config)
+    end
+
+    permissions(:enabled?) do
+      it 'reflects the config option' do
         %i[external_user admin teacher].each do |factory_name|
           expect(policy).not_to permit(FactoryBot.create(factory_name), codeharbor_link)
         end