Refactor registrars

#765

test/models/registrar/delete_test.rb

@@ -0,0 +1,37 @@
+require 'test_helper'
+
+class DeleteRegistrarTest < ActiveSupport::TestCase
+  def setup
+    @registrar = registrars(:not_in_use)
+  end
+
+  def test_can_be_deleted_if_not_in_use
+    assert_difference 'Registrar.count', -1 do
+      @registrar.destroy
+    end
+  end
+
+  def test_cannot_be_deleted_if_has_at_least_one_user
+    users(:api_bestnames).update!(registrar: @registrar)
+
+    assert_no_difference 'Registrar.count' do
+      @registrar.destroy
+    end
+  end
+
+  def test_cannot_be_deleted_if_has_at_least_one_contact
+    contacts(:john).update!(registrar: @registrar)
+
+    assert_no_difference 'Registrar.count' do
+      @registrar.destroy
+    end
+  end
+
+  def test_cannot_be_deleted_if_has_at_least_one_domain
+    domains(:shop).update!(registrar: @registrar)
+
+    assert_no_difference 'Registrar.count' do
+      @registrar.destroy
+    end
+  end
+end