Add ability to purge undeliverable domains from admin interface (#16686)

* Add ability to purge undeliverable domains from admin interface

* Add tests

1 files changed, 30 insertions, 5 deletions

diff --git a/spec/controllers/admin/instances_controller_spec.rb b/spec/controllers/admin/instances_controller_spec.rb
index 8c0b309f2..53427b874 100644
--- a/spec/controllers/admin/instances_controller_spec.rb
+++ b/spec/controllers/admin/instances_controller_spec.rb
@@ -3,8 +3,14 @@ require 'rails_helper'
 RSpec.describe Admin::InstancesController, type: :controller do
   render_views
 
+  let(:current_user) { Fabricate(:user, admin: true) }
+
+  let!(:account)     { Fabricate(:account, domain: 'popular') }
+  let!(:account2)    { Fabricate(:account, domain: 'popular') }
+  let!(:account3)    { Fabricate(:account, domain: 'less.popular') }
+
   before do
-    sign_in Fabricate(:user, admin: true), scope: :user
+    sign_in current_user, scope: :user
   end
 
   describe 'GET #index' do
@@ -16,10 +22,6 @@ RSpec.describe Admin::InstancesController, type: :controller do
     end
 
     it 'renders instances' do
-      Fabricate(:account, domain: 'popular')
-      Fabricate(:account, domain: 'popular')
-      Fabricate(:account, domain: 'less.popular')
-
       get :index, params: { page: 2 }
 
       instances = assigns(:instances).to_a
@@ -29,4 +31,27 @@ RSpec.describe Admin::InstancesController, type: :controller do
       expect(response).to have_http_status(200)
     end
   end
+
+  describe 'DELETE #destroy' do
+    subject { delete :destroy, params: { id: Instance.first.id } }
+
+    let(:current_user) { Fabricate(:user, admin: admin) }
+    let(:account) { Fabricate(:account) }
+
+    context 'when user is admin' do
+      let(:admin) { true }
+
+      it 'succeeds in purging instance' do
+        is_expected.to redirect_to admin_instances_path
+      end
+    end
+
+    context 'when user is not admin' do
+      let(:admin) { false }
+
+      it 'fails to purge instance' do
+        is_expected.to have_http_status :forbidden
+      end
+    end
+  end
 end