Add email subscriptions (#38163)

spec/requests/api/v1/accounts/email_subscriptions_spec.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Accounts Email Subscriptions API', feature: :email_subscriptions do
+  let(:account) { Fabricate(:user).account }
+
+  describe 'POST /api/v1/accounts/:id/email_subscriptions' do
+    context 'when the account has the permission' do
+      let(:role) { Fabricate(:user_role, permissions: UserRole::FLAGS[:manage_email_subscriptions]) }
+
+      before do
+        account.user.update!(role: role)
+      end
+
+      context 'when user has enabled the setting' do
+        before do
+          account.user.settings['email_subscriptions'] = true
+          account.user.save!
+        end
+
+        it 'returns http success' do
+          post "/api/v1/accounts/#{account.id}/email_subscriptions", params: { email: 'test@example.com' }
+
+          expect(response).to have_http_status(200)
+          expect(response.content_type)
+            .to start_with('application/json')
+        end
+      end
+
+      context 'when user has not enabled the setting' do
+        it 'returns http not found' do
+          post "/api/v1/accounts/#{account.id}/email_subscriptions", params: { email: 'test@example.com' }
+
+          expect(response).to have_http_status(404)
+        end
+      end
+    end
+
+    context 'when the account does not have the permission' do
+      it 'returns http not found' do
+        post "/api/v1/accounts/#{account.id}/email_subscriptions", params: { email: 'test@example.com' }
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+end